Development of an immiscible polymer/polymer/nanoparticle system to assess the location of nanoparticles by quantitative optical microscopy / L. H. B. Johansen in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 5 (11/2016)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXI, N° 5 (11/2016) . - p. 607-617 Titre : Development of an immiscible polymer/polymer/nanoparticle system to assess the location of nanoparticles by quantitative optical microscopy Type de document : texte imprimé Auteurs : L. H. B. Johansen, Auteur ; L. B. Canto, Auteur ; S. V. Canevarolo, Auteur Année de publication : 2016 Article en page(s) : p. 607-617 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Composites thermoplastiques Microscopie Morphologie (matériaux) Nanoparticules Polycarbonates Polystyrène Silice La silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux. La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...). Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale. Index. décimale : 668.4 Plastiques, vinyles Résumé : The thermo-optical behavior of immiscible PS/PC blends filled with silica nanoparticles was studied in order to get some information upon the location of nanoparticles in the polymer blend phases and interface using optical microscopy. The systems were designed taking into account rheological and optical requirements, having droplet-matrix morphology, with particle size in the range of the visible light wavelength. The melt blending procedure helped to set the nanoparticles at specific locations including within the PC minor phase, PS matrix phase and PS/PC interphase, which was confirmed via transmission electron microscopy. The light scattering was measured via the normalized transmitted light intensity over temperature, encompassing the Tg of the two polymers. The PS/PC blends showed an increase in the light scattering as compared to the pure polymers, which is magnified upon increasing the PC content. The addition of the nanosilica forming PS/PC/Nanosilica systems greatly reduces the light scattering, particularly above the Tg of the PS phase. The use of hydrophilic nanosilica does not show any appreciable hysteresis upon comparing data from heating and cooling cycles. This type of silica stays mainly trapped within the PC dispersed phase, little interfering with the light scattering, which happens at the polymer-polymer interface. On the other hand, the use of hydrophobic nanosilica does show a clear hysteresis. The hydrophobic silica located at the PS/PC interphase, interfere with the light scattering intensity at this interface, and can be used to identify its presence. The proposed procedure can help control the mixing process, thus improving the effective action of the nanoparticles in the final properties of polymer systems. Note de contenu : - EXPERIMENTAL : Materials - Polymer blending procedure - Phase morphology characterization - Transmitted light intensity quantification - RESULTS AND DISCUSSION : Designing the polymer-polymer-nanoparticle system - Morphology visualization via transmission electron microscopy - Quantitative optical microscopy - DOI : 10.3139/217.3241 En ligne : https://drive.google.com/file/d/1WYb-gYg0UrR9gSXTe0dtiHEPCF3V27Yo/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27398 [article]

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Direct method for deconvoluting two residence time distribution curves / S. V. Canevarolo in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 4 (12/2001)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVI, N° 4 (12/2001) . - p. 334-340 Titre : Direct method for deconvoluting two residence time distribution curves Type de document : texte imprimé Auteurs : S. V. Canevarolo, Auteur ; T. J. A Mélo, Auteur ; Jose A. Covas, Auteur ; Olga. S. Carneiro, Auteur Année de publication : 2001 Article en page(s) : p. 334-340 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Mixing and screw extrusion - A pair of related Residence Time Distribution (RTD) curves obtained experimentally during extrusion, are deconvoluted using a methodology based on the concept of equivalent residence times. Two points of two RTD curves are equivalent when the same percentage of tracer has exited the system. The time scale of the deconvoluted curve is obtained by subtracting the two equivalent time values of the available RTD curves. The method was tested using simulated pulse-shaped RTD curves and also carrying out measurements on a twin screw extruder. Despite the experimental errors involved, the two tests seem to demonstrate the usefulness of the approach. Note de contenu : - The deconvolution method - Convolution of two partial curves DOI : 10.3139/217.1660 En ligne : https://drive.google.com/file/d/1IC09HWbybhci3ASS0yZRCUpsy7dvUZF1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15917 [article]

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Residence time distribution curves of screw elements in twin-screw extruder / R. B. R. Calumby in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 3 (09/2002)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVII, N° 3 (09/2002) . - p. 183-191 Titre : Residence time distribution curves of screw elements in twin-screw extruder Type de document : texte imprimé Auteurs : R. B. R. Calumby, Auteur ; S. V. Canevarolo, Auteur Année de publication : 2002 Article en page(s) : p. 183-191 Note générale : L'article a été glissé par erreur dans le N° de juin 2002 - Bibliogr. Langues : Anglais (eng) Index. décimale : 668.4 Plastiques, vinyles Résumé : The additiveness of equivalent residence times method of deconvolution/convolution was used to determine the RTD curves of individual screw elements in the melt region of a twin-screw extruder. Initially RTD curves were obtained injecting a tracer (TiO2) at two different ports in the extruder barrel, using several screw configurations and operation conditions. Both ports are downstream, after the melt seal, well inside the molten polymer screw section. Then using the deconvolution method the RTD curve referent to the portion between the two ports was calculated. Finally, using again deconvolution method and the data from several screw configurations the RTD of each individual screw element was obtained. The independence of screw element positions was also evaluated, where specially designed screws (e. g. changing the position and type of screw elements) were tested, showing no significant effect in the RTD curves. Kneading elements of 45 degrees (KB45) showed an important contribution of conveying, while kneading elements of 90 degrees (KB90) practically do not show any conveying, being characterized mainly by a pressure flow. With RTD curves of individual elements is possible, using the convolution method, predict the RTD curve of any screw configuration. Experimental measurements using screw configurations specially designed were used to check this analytical method. Finally it was applied to data published in the literature, obtained using other deconvolution methods and the results compared and discussed. Note de contenu : - EXPERIMENTAL : Checking for the independence among screw elements - RTD curves of individual screw elements obtained by deconvolution - RESULTS AND DISCUSSION : Confirmation of the screw elements positioning independence - RTD curve of an individual screw element - Simulating a RTD curve from convoluting the behavior of each individual screw element - Comparison of deconvolution method with literature data DOI : 10.3139/217.1694 En ligne : https://drive.google.com/file/d/1xnXCZWQatcIQrMFp-ygKqoJH1w6oeNmf/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26362 [article]

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Thermomechanical degradation of polyetherimide (PEI) by friction-based joining and the effects on quasi-static mechanical strength of hybrid joints / M. Sônego in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIV, N° 1 (03/2019)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXIV, N° 1 (03/2019) . - p. 100-110 Titre : Thermomechanical degradation of polyetherimide (PEI) by friction-based joining and the effects on quasi-static mechanical strength of hybrid joints Type de document : texte imprimé Auteurs : M. Sônego, Auteur ; A. B. Abibe, Auteur ; S. V. Canevarolo, Auteur ; S. H. P. Bettini, Auteur ; J. F. dos Santos, Auteur ; L. B. Canto, Auteur ; S T. Amancio-Filho, Auteur Année de publication : 2019 Article en page(s) : p. 100-110 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Assemblages (technologie) Détérioration thermomécanique Essais dynamiques Matières plastiques -- Détérioration Polyéther imide Pyrolyse La pyrolyse est la décomposition ou thermolyse d'un composé organique par la chaleur pour obtenir d'autres produits (gaz et matière) qu'il ne contenait pas. L'opération est réalisée en l'absence d'oxygène ou en atmosphère pauvre en oxygène pour éviter l'oxydation et la combustion (L’opération ne produit donc pas de flamme). Il s'agit du premier stade de transformation thermique après la déshydratation. Elle permet généralement d'obtenir un solide carboné, une huile et un gaz. Elle débute à un niveau de température relativement bas (à partir de 200 °C) et se poursuit jusqu'à 1 000 °C environ. Selon la température, la proportion des trois composés résultants est différente. Soudage par friction Traction (mécanique) Index. décimale : 668.4 Plastiques, vinyles Résumé : This study investigated quantitatively the thermomechanical degradation of polyetherimide (PEI) due to Friction-based Injection Clinching Joining (F-ICJ) and the effects on the mechanical strength of hybrid joints with aluminum. PEI samples extracted from process-affected regions of the joints were characterized in terms of their molecular weight distribution (MWD) and glass transition temperature (Tg), while mechanical strength of the joints was evaluated by cross tensile testing. PEI samples produced by the most severe joining condition showed decrease of 37 % of number-average molecular weight (Mn) and 17 % of weight-average molecular weight (Mw), while polydispersity index (Mw/Mn) increased 33 % as compared with as-received polymer. The chain scission distribution function (CSDF) indicated non-random multiple scissions as the main degradation mechanism of PEI due to F-ICJ. From the dependence of Tg with Mn the parameters of the Fox-Flory equation for PEI were obtained. A fractional factorial design of experiments was adopted to analyze the influence of the process parameters on the polymer degradation, based on Tg values. High level of PEI degradation and microstructural defects caused by high energy inputs have combined negative effect on the ultimate cross tensile force and displacement of joints. In general, these results can contribute to the knowledge of thermomechanical degradation of PEI and help with the optimization of F-ICJ. Note de contenu : - EXPERIMENTAL : Materials - Joining process - Energy input - Size exclusion chromatography (SEC) - Differential scanning calorimetry (DSC) - Statistical analysis - Fractional factorial design (2 5-1) - Quasi-static mechanical testing - RESULTS AND DISCUSSION : Energy input provided by the friction welding - Thermomechanical degradation effect on the molecular distribution curve - Thermomechanical degradation effect on the glass transition temperature - Quasi-static mechanical strength of the joints DOI : 10.3139/217.3679 En ligne : https://drive.google.com/file/d/1MlgCiKm2DqYxBs9hljhWSDhPp0L3-gAZ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31920 [article]

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