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Climatic ageing of components of polymer based electrochromic devices / Hans-Peter Heim in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 3 (07/2013)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 3 (07/2013) . - p. 256-260 Titre : Climatic ageing of components of polymer based electrochromic devices Type de document : texte imprimé Auteurs : Hans-Peter Heim, Auteur ; Aline Desjean, Auteur Année de publication : 2013 Article en page(s) : p. 256-260 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Atmosphère humide Climat Dispositifs électrochromiques -- Détérioration Dispositifs électrochromiques -- Effets de la chaleur Fenêtres en matières plastiques Polycarbonates Polymères électrochromes Index. décimale : 668.4 Plastiques, vinyles Résumé : Combining a shading function and a polycarbonate window displays an attractive alternative to the currently employed glass roof in vehicles. However, the ageing of such a device must be investigated before any application. Therefore, our investigations focus on the ageing of the components of a polycarbonate based electrochromic device. The optical, electrical, mechanical and electrochemical properties of the ion storage layer as well as the substrate will be assessed after storage in a climate with a high humidity and high temperature level. Note de contenu : - Optical properties - Mechanical properties - Electrochemical properties DOI : 10.3139/217.2657 En ligne : https://drive.google.com/file/d/1fNw8RFFm9Ca_Wd2C9j5MvvWsC-wIVEUY/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19013 [article]

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Previous experimental polymer rheology flow induced crystallization / Hermann Janeschitz-Kriegl in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 3 (07/2013)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 3 (07/2013) . - p. 261-266 Titre : Previous experimental polymer rheology flow induced crystallization Type de document : texte imprimé Auteurs : Hermann Janeschitz-Kriegl, Auteur Année de publication : 2013 Article en page(s) : p. 261-266 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biréfringence La biréfringence est la propriété physique d'un matériau dans lequel la lumière se propage de façon anisotrope. Dans un milieu biréfringent, l'indice de réfraction n'est pas unique, il dépend de la direction de polarisation de l'onde lumineuse. (Wikipedia) Cristallisation Masse molaire La masse molaire est la masse d'une mole d'une substance (un corps simple, un composé chimique). Elle s'exprime en grammes par mole (g·mol−1 ou g/mol). Polystyrène Rhéologie Index. décimale : 668.4 Plastiques, vinyles Résumé : Experimental results, which have mostly been obtained with the aid of flow birefringence, are quoted. For a series of polystyrenes insights are obtained into the adjustment times for steady flow. For shear rates of practical interest these times are extremely short compared with the times showing up in the relaxation time spectrum. The question arises, whether this spectrum can still be of influence. Measurements on polyethylenes are quoted, which are in agreement. But this means that, fortunately, in capillary rheometry mostly the steady state viscosity is measured. This statement also holds for duct flow, which has often been used for the investigation of shear induced crystallization, in particular on polypropylenes. The linear stress optical rule is recalled. It reflects the persistence of an internal equilibrium, which breaks down only at high enough shear rates. This equilibrium seems to hold for the random flight statistics of chain segments connecting entanglements. The mentioned adjustment times are already short, before the said break down occurs. Note de contenu : - Behavior of polystyrene of usual molar mass distribution - Experience with polystyrenes of narrow molar mass distributions DOI : 10.3139/217.2694 En ligne : https://drive.google.com/file/d/1S5s-P7RUMHYmK2RwUhPyJRHgMmmeCfSw/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19014 [article]

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Studies on the effect of pellet size on positive conveying in helically grooved single screw extruders / M. Y. Jia in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 3 (07/2013)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 3 (07/2013) . - p. 267-273 Titre : Studies on the effect of pellet size on positive conveying in helically grooved single screw extruders Type de document : texte imprimé Auteurs : M. Y. Jia, Auteur ; L. Pan, Auteur ; P. Xue, Auteur ; K.-J. Wang, Auteur ; X.-M. Jin, Auteur Année de publication : 2013 Article en page(s) : p. 267-273 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cisaillement (mécanique) Extrudeuse monovis Granulats Polyéthylène basse densité Transport Index. décimale : 668.4 Plastiques, vinyles Résumé : The helical grooved barrel feed section permits, when the barrel channel aspect ratio and the barrel channel helical angle are properly designed, an operating mode where the positive conveying is prevailing. While the pellet size of materials is varied, different dimension relationships of the barrel channel depth and pellet size could induce different equivalent barrel channel aspect ratios with the transformation of solids conveying mechanisms from the positive conveying to the frictiondrag conveying. Considering the effect of dimension relationships on the solids conveying mechanism, a novel pelletsize physical model was established to guide the available design of the barrel channel geometry for positive conveying. In the pellet-size model, one or two shear interfaces were identified inside the solid-plug resulting in different equivalent barrel channel aspect ratios, based on which the solids conveying mechanism on the shear interfaces was detailed by the boundary condition equations for positive conveying. Besides, the theoretical simulations are also compared with the on-line measuring experimental data. The results show that the equivalent barrel channel aspect ratio on the shear interfaces exists indeed and determines the solids conveying mechanism, which is well confirmed by the excellent consistence between the predicted and measured data. DOI : 10.3139/217.2709 En ligne : https://drive.google.com/file/d/1NM3iQMBoXVnj3a4qcCi3HxnFnjaTp99O/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19015 [article]

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Distortion of interfaces in a multilayer polymer co-extrusion feedblock / B. A. Huntington in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 3 (07/2013)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 3 (07/2013) . - p. 274-280 Titre : Distortion of interfaces in a multilayer polymer co-extrusion feedblock Type de document : texte imprimé Auteurs : B. A. Huntington, Auteur ; E. Chabert, Auteur ; S. Rahal, Auteur ; J. Patz, Auteur ; J. Silva, Auteur ; P. Harris, Auteur ; J. Maia, Auteur ; Roger T. Bonnecaze, Auteur Année de publication : 2013 Article en page(s) : p. 274-280 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Eléments finis, Méthode des Interfaces (Sciences physiques) Matières plastiques -- Extrusion Polyméthacrylate de méthyle Le poly(méthacrylate de méthyle) (souvent abrégé en PMMA, de l'anglais Poly(methyl methacrylate)) est un polymère thermoplastique transparent obtenu par polyaddition dont le monomère est le méthacrylate de méthyle (MMA). Ce polymère est plus connu sous son premier nom commercial de Plexiglas (nom déposé), même si le leader global du PMMA est Altuglas International9 du groupe Arkema, sous le nom commercial Altuglas. Il est également vendu sous les noms commerciaux Lucite, Crystalite, Perspex ou Nudec. Polystyrène Rhéologie Simulation par ordinateur Structures multicouches Viscoélasticité Index. décimale : 668.4 Plastiques, vinyles Résumé : Numerical simulations of co-extruded multilayered viscoelastic polymers flowing through a feed block were performed to analyze the effects of polymer rheology and process conditions on the distortion of interfaces between layers. Finite element simulations assuming Phan-Thien Tanner viscoelastic fluids were used to test the effects of increasing the number of layers introduced to the feed block and decreasing wall friction on interface distortion. It was found that increasing the number of layers introduced to the feed block decreased the overall distortion in the layers by reducing the overall magnitude of second normal stress differences and thus decreasing the normal in-plane velocities that cause distortion, which was validated by experiments. Decreasing wall friction was also found to decrease the amount of distortion in layer interfaces by decreasing the strength of these second normal stress differences. DOI : 10.3139/217.2725 En ligne : https://drive.google.com/file/d/1v4DaG1mCZ5WKLuxPPzI1Z_FFeZFmKVa_/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19016 [article]

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Preparation and characterization of PES and PA composite membranes for air separation at low pressures / Sayed S. Madaeni in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 3 (07/2013)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 3 (07/2013) . - p. 281-290 Titre : Preparation and characterization of PES and PA composite membranes for air separation at low pressures Type de document : texte imprimé Auteurs : Sayed S. Madaeni, Auteur ; M. Esmaeili, Auteur ; S. Attar Nosrati, Auteur ; J. Barzin, Auteur Année de publication : 2013 Article en page(s) : p. 281-290 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Basse pression Caractérisation Gaz -- Séparation Membranes (technologie) Polyamides Un polyamide est un polymère contenant des fonctions amides -C(=O)-NH- résultant d'une réaction de polycondensation entre les fonctions acide carboxylique et amine. Selon la composition de leur chaîne squelettique, les polyamides sont classés en aliphatiques, semi-aromatiques et aromatiques. Selon le type d'unités répétitives, les polyamides peuvent être des homopolymères ou des copolymères. Polyéthersulfones Index. décimale : 668.9 Polymères Résumé : In this study poly(ether sulphone) (PES) asymmetric membranes and Polyamide (PA) composite membranes were used for gas separation at low pressures. The effect of PES concentration, contact time of sebacoyldichloride, addition of 1,6-hexaethylene diamine solution and PA active layer on the structures of PES support layer were studied. Changing the structure of PES membrane from channel-like to sponge form increased the selectivity in the gas separation process. However, this structural variation caused a considerable decline in gas permeability. The characteristics of top layer depend on the porosity and compactness of sub-layers structure. Active layer formation on the surface of support structure at PES concentrations of more than 25 %wt improved the oxygen selectivity considerably. The optimum conditions for preparation of PA active layer through interfacial polymerization process were elucidated in this paper. The PA composite membrane prepared at the PES concentration of 25 wt% and monomer concentration of 1 wt% provided the highest selectivity for oxygen enrichment process. Note de contenu : - EXPERIMENTAL : Materials - Fabrication of PES support membranes - Synthesis of composites membranes - Characterization methods - Gas permeation system - RESULTS AND DISCUSSION : Effect of PES concentration on the performance of composites membranes DOI : 10.3139/217.2728 En ligne : https://drive.google.com/file/d/1V46vi799gO6JYKXUDwT8ncJOc4UiBa_F/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19017 [article]

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Impact of feed opening width and position on PVC extrusion process effectiveness / Janusz W. Sikora in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 3 (07/2013)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 3 (07/2013) . - p. 291-299 Titre : Impact of feed opening width and position on PVC extrusion process effectiveness Type de document : texte imprimé Auteurs : Janusz W. Sikora, Auteur ; B. Samujlo, Auteur Année de publication : 2013 Article en page(s) : p. 291-299 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chlorure de polyvinyle Extrudeuse bi-vis Matières plastiques -- Extrusion Index. décimale : 668.4 Plastiques, vinyles Résumé : The influence of the feed opening axis width and position in relation to the plasticizing system axis on the effectiveness of the extrusion process of poly(vinyl) chloride has been studied. The research was conducted on the extrusion line for profiles with the extruder of the screw diameter 25 mm and L/D ratio = 25. In the extruder, the extruder head was mounted with a die of a rectangular cross-section shape for extruding a sheet of a defined width and thickness. The extruder was adapted for mounting five feed segments in the feed zone of the plasticizing unit; the segments differed from one another in terms of their feed opening width, the values of which were 0.6 D, 0.7 D, 0.8 D, 0.9 D and 1.0 D, respectively, whereas the values of the longitudinal axis shift of the opening relative to the longitudinal axis of the plasticizing unit were 0.2 D, 0.15 D, 0.10 D, 0.05 D and 0.0 D, respectively, which corresponded to 5 mm, 3.75 mm, 2.5 mm, 1.25 mm and 0 mm, respectively. The effectiveness of the polyvinyl chloride extrusion process was determined by dependences of extrudate temperature, extruder screw torque, polymer mass flow rate, power supplied to the extruder and conveyed by the polymer, unit energy consumption and energy efficiency of the extrusion process on the feed opening width and its axis position relative to the plasticizing unit axis, at different values of the screw rotational speed. It was stated that the width and position of the feed opening in relation to the plasticizing system axis can be adjusted in such a way that the extrusion process will be the most effective and other conclusions were also drawn. Note de contenu : - Research objective - Material - Test stand - Investigated factors - Test description DOI : 10.3139/217.2729 En ligne : https://drive.google.com/file/d/1IfYMsmED7TwqrNfBqopq25StqZ0RsORy/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19018 [article]

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Irradiation strategy for laser transmission welding of thermoplastics using high brilliance laser source / Mirko Aden in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 3 (07/2013)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 3 (07/2013) . - p. 300-305 Titre : Irradiation strategy for laser transmission welding of thermoplastics using high brilliance laser source Type de document : texte imprimé Auteurs : Mirko Aden, Auteur ; G. Otto, Auteur ; C. Duwe, Auteur Année de publication : 2013 Article en page(s) : p. 300-305 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Elastomères thermoplastiques Irradiation Matières plastiques -- Soudage Polyamide 66 Polyéther bloc amide Polymères -- Propriétés optiques Polypropylène Soudage laser Index. décimale : 668.4 Plastiques, vinyles Résumé : This article describes the correlation between crystallinity degree and spatial seam homogeneity for laser transmission welding of polymers applying TWIST method, which is based on a superposition of slow regular feed and fast periodic circular or elliptical beam motion. Laser welding experiments and measurements of optical polymer properties (transmittance, reflectance and collimated transmittance) are reported for thermoplastic polypropylene PP and Polyamide PA66 as well as for thermoplastic elastomer PEBAX. The shape of the seam is visualized by measuring the heat affected zone (HAZ). Compared to the circular the elliptical motion leads to a homogeneous HAZ, which is advantageous for the welding process in many cases. Besides TWIST parameters, scattering of the laser radiation influences the welding result considerably. This is shown for high-crystallinity PA66, which needs more laser power to achieve similar weld seams than PP or PEBAX. The correspondence between homogeneous HAZ and good welding results is investigated by measuring the strength of welded T-shape samples with respect to the laser power. The elliptic TWIST motion leads to a broader processing window, if the ratio of the beam diameter and the major TWIST radius is smaller than a certain value (< 1/2). For PEBAX, a local maximum of strength-vs.-power curve is obtained for all TWIST® radii. For welding PP, the maximum is observed only for big radii. DOI : 10.3139/217.2732 En ligne : https://drive.google.com/file/d/1z-IaKY9Rb9wUW2UWbsZXDgkW0HpEI3aG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19019 [article]

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Polytetrafluoroethylene paste extrusion : a fibrillation model and its relation to mechanical properties / H. A. Ardakani in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 3 (07/2013)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 3 (07/2013) . - p. 306-313 Titre : Polytetrafluoroethylene paste extrusion : a fibrillation model and its relation to mechanical properties Type de document : texte imprimé Auteurs : H. A. Ardakani, Auteur ; Evan Mitsoulis, Auteur ; Savvas G. Hatzikiriakos, Auteur Année de publication : 2013 Article en page(s) : p. 306-313 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Fibrillation Matières plastiques -- Extrusion Polymères -- Propriétés mécaniques Polytétrafluoréthylène Rhéomètres Traction (mécanique) Index. décimale : 668.4 Plastiques, vinyles Résumé : The effects of process conditions on fibrillation and mechanical properties of polytetrafluoroethylene (PTFE) paste extrudates have been studied using capillary rheometers having barrels of different diameter and equipped with capillary dies of various designs. The tensile strength of PTFE extrudates is measured as a function of apparent shear rate (flow rate), reduction ratio (cross sectional area of barrel to that of die), contraction angle, and diameter of the barrel. To describe the effects of die design on the quality of the final product, a basic phenomenological mathematical model has been developed. The model consists of a simple equation that explains fibril formation, due to the compression of PTFE resins, plus a kinetic equation, which is coupled with the "radial-flow" hypothesis to predict the structure and the tensile strength of extrudates. The model predictions are found to be consistent with tensile strength measurements and SEM micrographs of the PTFE extrudates. Note de contenu : - EXPERIMENTAL : Materials - Methods - Phenomenological model for fibrillation - RESULTS AND DISCUSSION : Effect of apparent shear rate - Effect of contraction angle - Effect of reduction ratio - Effects of barrel size DOI : 10.3139/217.2744 En ligne : https://drive.google.com/file/d/16QKi1ff22J6kFEyW3RUQv4MlxNdfTBAC/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19020 [article]

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Improving weld line strength of fiber reinforced plastics by means of a "flow disruptor" / Fabian Rios Rios in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 3 (07/2013)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 3 (07/2013) . - p. 314-321 Titre : Improving weld line strength of fiber reinforced plastics by means of a "flow disruptor" Type de document : texte imprimé Auteurs : Fabian Rios Rios, Auteur ; M. Reuven-Zada, Auteur ; R. Kol, Auteur ; S. Yoffe, Auteur ; Samuel Kenig, Auteur Année de publication : 2013 Article en page(s) : p. 314-321 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à fibres Fibres Matières plastiques -- Propriétés mécaniques Matières plastiques -- Soudage Polypropylène Tags : Polypropylène  'Effacement  ligne  soudure'  Renfort  Fibres  'Soudage  plastique'  'Propriétés  mécaniques'  'Ecoulement  perturbateur' Index. décimale : 668.4 Plastiques, vinyles Résumé : The presence of weld lines can cause a significant reduction in the mechanical properties of injection molded plastic parts, especially when they contain minerals additives or fiber reinforcements, and it is a common reason for their failure. In this work a method for modifying the flow pattern in the weld line zone using a "flow disruptor" is proposed to strengthen the weld lines of fiber reinforced polypropylene. The flow disruptor is a small insert introduced inside the injection molding cavity, in the weld line area, and its objective is to mix the melt and disrupt fountain flow in order to blur and erase the weld line. The method is simple and low cost, does not require special machines or molds and does not affect the part shape or surface. Flow disruptors were designed, their effects analyzed by using simulation software, fabricated from different materials and encapsulated within injection molded tensile test samples for mechanical properties evaluation. The results of this work demonstrate that the mechanical properties in the weld line can be improved by the use of a well designed flow disruptor, made from suitable materials. DOI : 10.3139/217.2745 En ligne : https://drive.google.com/file/d/1KYSaDJhjl3aPeg_2gKEBfU2WHqah2FDR/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19021 [article]

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Application of the network simulation method to flat dies with inverted prelands / Thomas Köpplmayr in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 3 (07/2013)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 3 (07/2013) . - p. 322-330 Titre : Application of the network simulation method to flat dies with inverted prelands Type de document : texte imprimé Auteurs : Thomas Köpplmayr, Auteur ; Jürgen Miethlinger, Auteur Année de publication : 2013 Article en page(s) : p. 322-330 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Algèbre Analyse mathématique Ecoulement tridimensionnel Ecoulement visqueux Etat fondu (matériaux) Fluide de Carreau Le fluide de carreau est un type de fluide newtonien généralisé où la viscosité, dépend du taux de cisaillement. Fluides, Mécanique des Polymères Simulation, Méthode de Index. décimale : 668.4 Plastiques, vinyles Résumé : We present a systematic approach based on Kirchhoff’s laws that uses tensor algebra and analytical formulae obtained from constitutive equations for the analysis of flow resistance networks. The flow of a Carreau fluid in a flat die with inverted preland is analyzed in terms of mass flow, velocity, and residence time distributions. Viscous heating is taken into account by using an analytical model which depends on the Cameron number of the flow at different positions. Further, we report the results of a three-dimensional simulation, using the commercially available ANSYS Polyflow software, which are in good agreement with our numerical study. Note de contenu : - MODELING FRAMEWORK : Implementation of carreau model - Network analysis - Numerical determination of flow coefficients - Viscous dissipation - SIMULATION DOI : 10.3139/217.2758 En ligne : https://drive.google.com/file/d/1EabP6OgqMVCfCO3seu19wDS6XUf2gwnt/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19022 [article]

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In situ polymerization of PET in the presence of pristine and organo-modified clays / Babak Esmaeili in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 3 (07/2013)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 3 (07/2013) . - p. 331-340 Titre : In situ polymerization of PET in the presence of pristine and organo-modified clays Type de document : texte imprimé Auteurs : Babak Esmaeili, Auteur ; C. Dubois, Auteur ; P. J. Carreau, Auteur ; M.-C. Heuzey, Auteur Année de publication : 2013 Article en page(s) : p. 331-340 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile Cloisite Matériaux hybrides Microscopie électronique à balayage Montmorillonite Oligomères Polycondensation Polyéthylène téréphtalate Polymérisation Silicates Index. décimale : 668.4 Plastiques, vinyles Résumé : In this work two types of montmorillonite, a pristine and an organo-modified clay (Cloisite 30B), were employed to produce (polyethylene terephthalate)-based nanocomposites via in situ polymerization. Using water as an intermediate medium, a stable dispersion of pristine clay in ethylene glycol was achieved. However, after polymerization, no significant gain was obtained in terms of delamination of silicate platelets. The polycondensation reaction when using Cloisite 30B was carried out at a temperature as low as 250 °C in order to retain a considerable portion of the organo-modifier. The results showed that Cloisite 30B was successfully intercalated by the polymer chains, resulting in a d-spacing increase from 1.9 nm to about 3.6 nm. Although some mono and double silicate layers were observed in microscopy images, the major part of the organoclay remained in a tactoid intercalated form. Sampling during the polycondensation reaction revealed that, in this process, clay was first swelled efficiently by the monomer, and this structure was preserved in the early stage of polycondensation. However, the silicate platelets collapsed with time as the polycondensation progressed and larger molecular weight oligomers were formed. An investigation on the type of impeller used in the polymerization process showed that a slight improvement was achieved in terms of aggregate size and distribution when the anchor impeller was replaced by a helical one. Note de contenu : - EXPERIMENTAL : Materials - Experimental set-up - Insitu polymerization procedure - CHARACTERIZATION - RESULTS AND DISCUSSION : Incorporation of pristine clay in the polymerization process - Incorporation of cloisite 30B in the polymerization process - The effect of impeller DOI : 10.3139/217.2760 En ligne : https://drive.google.com/file/d/1NKVQI71S9dtRtWmF9aqWsAS0geFf6Wxb/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19023 [article]

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Accurate bio-scaling processing of micro structured shark skin based on swelling of polydimethylsiloxane / J.-F. Pan in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 3 (07/2013)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 3 (07/2013) . - p. 341-345 Titre : Accurate bio-scaling processing of micro structured shark skin based on swelling of polydimethylsiloxane Type de document : texte imprimé Auteurs : J.-F. Pan, Auteur ; Huawei Chen, Auteur ; D.-Y. zhang, Auteur ; X. Zhang, Auteur ; L.-M. Yuan, Auteur ; M.-Y. Guo, Auteur Année de publication : 2013 Article en page(s) : p. 341-345 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents d'expansion (chimie) Aspect peau de requin Chimie biomimétique Hexane Microstructures Polydiméthylsiloxane Le polydiméthylsiloxane —[O-Si(CH3)2]n—, ou poly(diméthylsiloxane) selon la nomenclature systématique, communément appelé PDMS ou diméthicone, est un polymère organominéral de la famille des siloxanes souvent présent dans les shampoings. On l'y ajoute pour augmenter le volume des cheveux mais il peut également aller boucher les pores du cuir chevelu et rendre les cheveux gras. C'est une des raisons pour lesquelles se laver les cheveux tous les jours est très déconseillé avec un shampooing contenant des silicones. Il existe également de l'amodiméthicone, qui est un dérivé du diméthicone. Le polydiméthylsiloxane est un additif alimentaire (E900), utilisé comme antimoussant dans les boissons (Coca-Cola BlāK). La chaîne de poly(diméthylsiloxane) forme également la structure de base des huiles et des caoutchoucs silicones. solvants Surfaces fonctionnelles Index. décimale : 668.4 Plastiques, vinyles Résumé : Natural surface has kinds of sophisticated micro structures which formed various superior functions such as drag reduction through biological evolution. However, such function performs to maximum just at its living environment. In order to adjust the optimal function region of natural surface, one novel approach, bio-scaling forming process, is proposed to by taking advantage of solvent-swelling effect of Polydimethylsiloxane. To realize the accurate replication of bioscaled shark skin, swelling ratio and swelling rate in gaseous n-Hexane are investigated. The accuracy of bio-scaling processing approach is verified by comparison between microstructure of original and amplified shark skin, which shows that the swelling ratio can reach even to 34 %, and the bioscaling processing accuracy is higher than 95 %. In addition, both the water contact angle and the optimal velocity range of drag reduction will change with the amplification. Note de contenu : - Swelling ratio and rate control of PDMS - Micromorphology accuracy of bio-scaling processing - Application of amplified shark skin DOI : 10.3139/217.2754 En ligne : https://drive.google.com/file/d/1spGSFkRzJXrEI0-y6tqK8c28PipJxFRv/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19024 [article]

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