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Constitutive modeling of nonlinear rheological behavior of carbon nanotube-filled polypropylene nanocomposites / S. S. Pole in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 3 (2021)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 3 (2021) . - p. 233-254 Titre : Constitutive modeling of nonlinear rheological behavior of carbon nanotube-filled polypropylene nanocomposites Type de document : texte imprimé Auteurs : S. S. Pole, Auteur ; Avraam I. Isayev, Auteur ; J. Zhong, Auteur Année de publication : 2021 Article en page(s) : p. 233-254 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cisaillement (mécanique) Matériaux hybrides Nanotubes de carbone à parois multiples Un nanotube de carbone multifeuillet est constitué de plusieurs feuillets de graphènes enroulés les uns autour des autres. Il existe deux modèles pour décrire la structure des nanotubes multifeuillets : - le modèle poupée russe: les plans de graphène sont arrangés en cylindres concentriques ; - le modèle parchemin: un seul feuillet de graphène est enroulé sur lui-même, comme une feuille de papier. Polypropylène Rhéologie Index. décimale : 668.4 Plastiques, vinyles Résumé : The rheological behavior of multi-walled carbon nanotube (MWCNT)-filled polypropylene (PP) nanocomposites with different filler loadings was experimentally studied and simulated using constitutive modeling. Rheological behavior was characterized in small amplitude oscillatory shear (SAOS) flow, large amplitude oscillatory shear (LAOS) flow, startup of shear flow, steady shear flow, and stress relaxation after the imposition of a step shear strain. Virgin PP and PP with CNT loadings of 1, 3, and 5 wt% were used. The formation of a rheological percolation network was observed at these loadings. The Leonov and Simhambhatla-Leonov models were used to simulate the rheological behavior. In the linear region, the simulations provided good predictions of the experimental data for both the unfilled and filled PP. In the nonlinear region, the simulations also provided good results for the virgin PP and satisfactory results for the PP/1 wt%CNT nanocomposite under most flow conditions. However, for the other two nanocomposites the model showed mixed results. Note de contenu : - SIMULATING RHEOLOGICAL BEHAVIOR USING THE LEONOV AND SIMHAMBHATLA-LENOV CES : Modeling SAOS - Modeling LAOS - Modeling startup and steady shear flow - Modeling stress relaxation after a step strain - MATERIALS AND METHODS : Materials - Composite preparation - Rheological testing - Model parameters - RESULTS AND DISCUSSION : SAOS - LAOS - Startup shear - Steady shear - Cox-Merz rule - Philippoff approach - Stress relaxation after a step strain - Table 1 : Matrix modes for the virgin PP - Table 2 : The parameters f, Zc, and Gp for the PP/CNT nanocomposites for the Leonov model - Table 3 : The parameters f , Zc, Gp, and r for the PP/CNT nanocomposites for the Simhambhatla-Leonov model - Table 4 : Particle modes for the PP/CNT nanocomposites for the Leonov model DOI : https://doi.org/10.1515/ipp-2020-4055 En ligne : https://drive.google.com/file/d/1klfXR0nsF7XyiVbq-SM8CCc7eIFZOJYa/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36367 [article]

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Modeling short-range interactions in concentrated newtonian fiber bundle suspensions / N. Meyer in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 3 (2021)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 3 (2021) . - p. 255-263 Titre : Modeling short-range interactions in concentrated newtonian fiber bundle suspensions Type de document : texte imprimé Auteurs : N. Meyer, Auteur ; Andrew N. Hrymak, Auteur Année de publication : 2021 Article en page(s) : p. 255-263 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composés de moulage en feuille Composites à fibres discontinues Dispersions et suspensions Simulation, Méthode de Index. décimale : 668.4 Plastiques, vinyles Résumé : Sheet Molding Compounds (SMC) offer a cost efficient way to enhance mechanical properties of a polymer with long discontinuous fibers, while maintaining formability to integrate functions, such as ribs, beads or other structural reinforcements. During SMC manufacturing, fibers remain often in a bundled configuration and the resulting fiber architecture determines part properties. Accurate prediction of this architecture by simulation of flow under consideration of the transient rheology and transient fiber orientations can speed up the development process. In particular, the interaction of bundles is of significance to predict molding pressures correctly in a direct simulation approach, which resolves individual fiber bundles. Thus, this work investigates the tangential short-range lubrication forces between fiber bundles with analytical and numerical techniques. A relation between the effective sheared gap between bundles and the bundle separation distance at the contact point is found and compared to experimental results from literature. The result is implemented in an ABAQUS contact subroutine to incorporate short-range interactions in a direct bundle simulation framework. Note de contenu : - INTRODUCTION : Long-range interactions - Short-range interactions - ANALYTICAL CONSIDERATIONS ON THE SHEARED GAP - PARAMETRIC STUDY : Model results - APPLICATION TO DIRECT BUNDLE SIMULATION - Table 1 : Simulation parameters DOI : https://doi.org/10.1515/ipp-2020-4051 En ligne : https://drive.google.com/file/d/1B2Omn_i8VU9uuP9x82jzggo2bEz1989n/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36368 [article]

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The polymer film casting process - An overview / Y. Demay in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 3 (2021)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 3 (2021) . - p. 264-275 Titre : The polymer film casting process - An overview Type de document : texte imprimé Auteurs : Y. Demay, Auteur ; Jean-François Agassant, Auteur Année de publication : 2021 Article en page(s) : p. 264-275 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Films coulés Films plastiques Matières plastiques -- Défauts Matières plastiques -- Extrusion Modèles numériques Index. décimale : 668.4 Plastiques, vinyles Résumé : Cast film extrusion allows producing technical polymer films for packaging and coating applications. Different kinds of defects may be observed. For packaging applications, the challenge is to obtain very thin films in stable conditions at the highest throughput. For coating applications, the challenge is to master the film width reduction (called neck-in) and the induced non-uniform film thickness (called dog-bone defect). Well instrumented experiments point out the influence of the polymer and of the processing conditions on the occurrence of these defects. Numerical models of increasing complexity allow capturing the main experimental features and this makes possible to propose technological solutions to delay or even to suppress defects occurrence. Note de contenu : - EXPERIMENTS : Non-dimensional numbers - Stationary experiments - Non-stationary experiments - NUMERICAL MODELLING : Constant width models - Membrane models - Coupled extrusion-stretching models DOI : https://doi.org/10.1515/ipp-2020-4061 En ligne : https://drive.google.com/file/d/10LVeORGEFd57b0lFCu0vJuBG-RavhAvT/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36369 [article]

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Micro-injection molding of polymer nanocomposites composition-process-properties relationship in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 3 (2021)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 3 (2021) Titre : Micro-injection molding of polymer nanocomposites composition-process-properties relationship Type de document : texte imprimé Année de publication : 2021 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Composites à fibres -- Moulage par micro-injection Composites à fibres de carbone -- Propriétés électriques Composites à fibres de carbone -- Propriétés mécaniques Composites à fibres de carbone -- Propriétés thermiques Matériaux hybrides Microstructures Plan d'expérience Polyamide 66 Polycarbonates Rhéologie Index. décimale : 668.4 Plastiques, vinyles Résumé : The mechanical, electrical, thermal, and rheological properties of micro injection molded nanocomposites comprising 2% and 5% carbon nanotubes (CNTs) incorporated in polycarbonate (PC), and polyamide 66 (PA) were studied. The design of experiments method was used to investigate the composition-process – properties relationship. Results indicated that the process variables significantly affected the flow patterns and resulting morphology during the filling stage of the microinjection molding (lIM) process, using 0.45 mm diameter lIM samples. Two distinct flow regimes have been identified in lIM using the low cross-section samples. The first was a conventional “fountain flow,” which resulted in a skin/core structure and reduced volume resistivity up to 10 X cm in the case of 5% CNTs and up to 100 X cm in 2% CNTs, in both polymers, respectively. In addition, inferior mechanical properties were obtained, attributed to polymer degradation under high shear rate conditions, when practicing high injection speeds, high mold temperatures, and high screw rotation velocities. The second was a “plug flow” due to wall slippage, obtained under low injection speeds, low mold temperatures, and low rotation velocities, leading to a substantial increase in modulus of elasticity (60%) with increased electrical resistivity up to 103 X cm for 5% CNTs and 105 X cm for 2% CNTs, respectively. The rheological percolation threshold was obtained at 2% CNTs while the electrical threshold was attained at 0.4% CNTs, in both polymers. It was concluded that in lIM, the process conditions should be closely monitored. In the case of high viscous heating, degradation of mechanical properties was obtained, while skin- core morphology formation enhanced electrical conductivity. Note de contenu : - EXPERIMENTAL : Materials - Preparation of microparts - Characterization - RESULTS AND DISCUSSION : Rheological properties - Flow analysis - Design of experiments - Electrical properties - Microstructure - Table 1 : Micro molding vs. conventional molding - Table 2 : DOE scheme - Table 3 : The main parameters with the highest significance on mechanical properties of μIM DOI : https://doi.org/10.1515/ipp-2020-4065 En ligne : https://drive.google.com/file/d/1wsZNRlMh8sy7_TbAxv4oovCgnP2Mipp9/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36370 [article]

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Nanoclay migration and the rheological response of PBAT-LDPE blends / M. Nofar in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 3 (2021)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 3 (2021) . - p. 287-296 Titre : Nanoclay migration and the rheological response of PBAT-LDPE blends Type de document : texte imprimé Auteurs : M. Nofar, Auteur ; M. Mohammadi, Auteur ; P. J. Carreau, Auteur Année de publication : 2021 Article en page(s) : p. 287-296 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Argile Cloisite Energie de surface Morphologie (matériaux) Nanoparticules Polybutylène-adipate-téréphtalate Polyéthylène basse densité Rhéologie Tension superficielle Index. décimale : 668.4 Plastiques, vinyles Résumé : Blends of a poly(butylene adipate-co-terephthalate) (PBAT) and a low density polyethylene (LDPE) (80 wt%/20 wt%) were prepared through a twin screw extruder while incorporating 3 wt% Cloisite 30B (C30B) nanoclay that possessed a much higher affinity with PBAT. The blends were processed through three melt mixing strategies: ( i) direct mixing of all three components, (ii) mixing C30B and PBAT followed by mixing with LDPE, and (iii) mixing C30B and LDPE followed by mixing with PBAT. The rheological properties of each system were determined in small amplitude oscillatory shear (SAOS) experiments. The migration of C30B nanoparticles from the LDPE minor phase towards the PBAT matrix was then monitored in the blend nanocomposites prepared through strategy (iii) via SAOS time sweep experiments. It was firstly understood that the C30B migration could be detected during time sweep SAOS experiments. The migration time was observed to be frequency dependent due to the smaller length scales probed at larger frequencies. Such migration occurred even faster when the SAOS time sweep experiments were conducted at a higher temperature due to the viscosity reduction. Note de contenu : - EXPERIMENTAL : Materials - Melt compounding and blend nanocomposite preparation - Surface energy, interfacial tension, and localization analysis - Morphological analysis - Rheological measurements - RESULTS AND DISCUSSION : Characteristics of neat polymers and c30b localization - Morphological and rheological properties of the blend and blend nanocomposites - Monitoring C30B migration through SAOS experiments - Relationship between nanoparticle migration, applied frequency, and LDPE viscosity DOI : https://doi.org/10.1515/ipp-2020-4057 En ligne : https://drive.google.com/file/d/1XhPD0BX6SWTIUyaH0mkZ-xOdYeN3qEoS/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36371 [article]

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Composites of cysteamine functionalised graphene oxide and polypropylene / S. S. Abbas in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 3 (2021)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 3 (2021) . - p. 297-313 Titre : Composites of cysteamine functionalised graphene oxide and polypropylene Type de document : texte imprimé Auteurs : S. S. Abbas, Auteur ; T. McNally, Auteur Année de publication : 2021 Article en page(s) : p. 297-313 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anhydride maléique Caractérisation Composites -- Propriétés mécaniques Copolymères greffés Cystéamine La cystéamine est le plus simple aminothiol stable. Naturellement présente dans le corps humain, elle est un produit de la dégradation de l'acide aminé cystéine. Elle est utilisée dans le traitement de la cystinose sous le nom commercial Cystagon. La cystéamine est un antioxydant naturel qui est produit dans presque toutes les cellules mammifères. Elle est également connue pour son effet dépigmentant depuis quelques dizaines d'années. En crème, la cystéamine a une certaine efficacité pour le traitement de l'hyperpigmentation cutanée. Greffage (chimie) Mélanges (chimie) Oxyde de graphène Polypropylène Transition vitreuse Index. décimale : 668.4 Plastiques, vinyles Résumé : Cysteamine functionalised reduced graphene oxide (rGO) was grafted to polypropylene-graft-maleic anhydride (PP-g-MA) and subsequently melt blended with PP. The covalent bridging of rGO to PP-g-MA via the cysteamine molecule and co-crystallization are routes to promoting interfacial interactions between rGO and the PP matrix. A rheological percolation threshold was achieved for a nanofiller loading between 3 wt% and 5 wt%, but none detected for the composites prepared with un-functionalized rGO. At low loadings (0.1 wt%), functionalized rGO is well dispersed in the PP matrix, an interconnecting filler-filler, polymer-filler and polymer-polymer network is formed, resulting in increased tensile toughness (1 500%) and elongation at break (40%) relative to neat PP. Irrespective of whether the rGO was functionalised or not, it had a significant effect on the crystallization behavior of PP, inducing heterogeneous nucleation, increasing the crystallisation temperature (Tm) of PP by up to 10°C and decreasing the crystalline content (Xc) by ∼30% for the highest (5 wt%) filler loading. The growth of the monoclinic a-phase of PP is preferred on addition of functionalised rGO and b crystal growth suppressed. Note de contenu : - Materials - Synthesis of PP-g-MA-rGOcyst - Composite preparation - Characterisation - Table 1 : Nomenclature and composition of blends studied - Table 2 : Thermal parameters for neat PP, PP/NF, PP/C/NF and PP/C/NF-F composites determined from DSC measurementsFWHM and ACS values calculated from XRD peaks for (100), (300), and (040) crystal planes. Kβ values tabulated for neat PP, PP/NF, PP/C/NF and PP/C/NF-F composites - Table 3 : Glass transition temperature (Tg) determined from tan δ and Eʺ plots as a function of temperature, and tan δ values at Tg for neat PP, PP/NF, PP/C/NF and PP/C/NF-F composites DOI : https://doi.org/10.1515/ipp-2020-4079 En ligne : https://drive.google.com/file/d/1ShZCNSk1QDvSAea3VelY1Njef3716PSD/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36372 [article]

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Effect of uniaxial stretching on molecular orientation, crystallinity and oxygen permeability of ethylene vinyl alcohol / L. Wang in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 3 (2021)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 3 (2021) . - p. 314-321 Titre : Effect of uniaxial stretching on molecular orientation, crystallinity and oxygen permeability of ethylene vinyl alcohol Type de document : texte imprimé Auteurs : L. Wang, Auteur ; E. Jalali Dil, Auteur ; Abdellah Ajji, Auteur Année de publication : 2021 Article en page(s) : p. 314-321 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse thermique Copolymère éthylène alcool de vinyle C'est aujourd'hui le matériau le plus utilisé dans l'emballage rigide alimentaire. Il peut être utilisé avec des matériaux de structure comme le polyéthylène, polypropylène ou polystyrène. Ce copolymère présente une excellente imperméabilité à l'oxygène, au gaz carbonique et aux arômes, à condition de protéger de l'influence de l'humidité qui fait chuter fortement ses performances. Pour palier cet inconvénient, il est souvent pris en sandwich dans des structures multicouches à base de polyoléfines PE ou PP peu sensibles à l'humidité. Il est utilisé pour les emballages de compotes, jus de fruits, fromages, sauces, crèmes et yaourts, mayonnaise, sauce tomate... Diffraction des rayons X à grand angle Etirement (mécanique) Films plastiques Orientation moléculaire (matériaux) Oxygène Perméabilité Structures multicouches Index. décimale : 668.4 Plastiques, vinyles Résumé : This work studies the effects of uniaxial stretching on molecular orientation, crystallinity, crystallography and oxygen permeability of high barrier multilayer films based on EVOH barrier layer. Film samples were prepared using two different blow-up ratios (BUR) of 1 and 3. Uniaxial stretching was applied at 100°C using a tensile machine equipped with an environmental chamber. Fourier transform infrared (FTIR) spectroscopy was used to examine the molecular orientation in the EVOH layer before and after stretching and confirmed a considerable increase in the molecular orientation in the EVOH layer. Dynamic scanning calorimetry (DSC) and wide-angle X-ray diffraction (XRD) results point to the perfection of EVOH crystal structure by applying uniaxial stretching at high temperatures. Oxygen permeability results showed a considerable 25% decrease after stretching of the sample with lower BUR while a significant 80% reduction in oxygen permeability was observed for the sample prepared at higher BUR. The mechanism involved in increasing oxygen permeability due to the uniaxial stretching at high temperature is discussed in detail. Note de contenu : EXPERIMENTAL : Materials - Film and sheet preparation - Uniaxial stretching - Scanning electron microscopy (sem) - Oxygen transmission - Differential scanning calorimetry (DSC) - Wide angle X-ray diffraction (WAXD) - Orientation index RESULTS AND DISCUSSION : Effect of stretching on layer thicknesses in the multilayer films - Effect of uniaxial stretching on molecular orientation - Effect of stretching on EVOH crystallinity and crystallography - Effect of uniaxial stretching on oxygen permeability of EVOH - Table 1 : Thickness of the layers in multilayer film samples measured from SEM image analysis - Table 2 : Calculated orientation indices of the film samples - Table 3 : Summary of DSC results for film samples before and after stretching DOI : https://doi.org/10.1515/ipp-2020-4062 En ligne : https://drive.google.com/file/d/1aV48yWOxkqVWcsGUygndhOcYux8ywd9r/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36373 [article]

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Investigation of microstructure and air permeability of aerogel-coated textile fabric materials / A. Fonner in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 3 (2021)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 3 (2021) . - p. 322-331 Titre : Investigation of microstructure and air permeability of aerogel-coated textile fabric materials Type de document : texte imprimé Auteurs : A. Fonner, Auteur ; Sadhan C. Jana, Auteur Année de publication : 2021 Article en page(s) : p. 322-331 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Aérogels Air Caractérisation Enduction textile Filtration Matériaux poreux Microstructures -- Analyse Perméabilité Polyesters Polyimides Polystyrène Séchage Textiles et tissus synthétiques Index. décimale : 668.4 Plastiques, vinyles Résumé : This study focuses on fabrication of aerogel-coated macroporous polyester fabrics for the purposes of filtration of nanometric airborne particles and potential application in facemasks. Syndiotactic polystyrene (sPS) and polyimide (PI) gels that provide respectively majority macropores (diameter > 50 nm) and mesopores (diameter 2 to 50 nm) are coated onto woven polyester fabrics via a dip coating process. The resultant materials are supercritically dried to obtain aerogelcoated fabrics. The results show that sPS is more suitable for the dip coating process. However, evaporation of the solvent during handling of gel-coated fabrics leads to closure of the surface pores that are later recovered via solvent annealing. The resultant aerogel-coated fabrics offer high air permeability (∼10–10 m2) and high filtration efficiency (> 99.95%) of airborne sodium chloride test particles of size 25 to 150 nm. Note de contenu : - EXPERIMENTAL : Materials - Preparation of sol - Preparation of aerogel-coated fabric - Supercritical drying - Characterization - Air permeability and filtration efficiency - RESULTS AND DISCUSSION : Quality of aerogel-coated fabric substrates - Aerogel coating thickness - Density and porosity - Specific surface area and porosity - Permeability - Effects of solvent annealing - Table 1 : Thickness of sPS aerogel coating as function of retraction rate from solution followed by drying for 3 min - Table 2 : BET surface area and pore fractions - Table 3 : Air permeability and filtration efficiency - Table 4 : Effect of annealing in THF vapor on fabric thickness - Table 5 : Density and porosity data of solvent annealed specimens - Table 6 : Surface area and pore volume fraction of annealed aerogelcoated fabric - Table 7 : Permeability values of annealed aerogel coated fabric and commercially available personal filtration devices DOI : https://doi.org/10.1515/ipp-2020-4095 En ligne : https://drive.google.com/file/d/1PQEzJCBqaEWmWWTzTat875yHMb-Pl-W2/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36374 [article]

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In situ visualization for control of nano-fibrillation based on spunbond processing using a polypropylene-polyethylene terephthalate system / A. N. Md. Shahin in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 3 (2021)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 3 (2021) . - p. 332-344 Titre : In situ visualization for control of nano-fibrillation based on spunbond processing using a polypropylene-polyethylene terephthalate system Type de document : texte imprimé Auteurs : A. N. Md. Shahin, Auteur ; V. Shaayegan, Auteur ; P. C. Lee, Auteur ; C. B. Park, Auteur Année de publication : 2021 Article en page(s) : p. 332-344 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Fibres textiles synthétiques Fibrillation Filature Liage Microfibres Nanofibres Nanotechnologie Polyéthylène téréphtalate Polypropylène Rhéologie Index. décimale : 668.4 Plastiques, vinyles Résumé : In situ generation of polyethylene terephthalate (PET) nanofibrils in polypropylene (PP) microfibers via fiber spinning in a spunbond process was studied in this work. The effects of polymer flow rate and air speed in the drafter on the formation of PET fibrils were investigated using a pilot scale machine. An in-situ visualization technique was applied to examine the fiber evolution events and stretch profile at die exit. A scanning electron microscope was used to analyze and investigate the morphology of the dispersed domain. The PET dispersed phase was fibrillated within the PP matrix such that a nonofibrillated composite containing fibrils with an average size around 100 nm was obtained. It was found that the final fibril size directly depends on the degree of die swell, the air speed and the polymer flow rate. It was also found that the in situ observed size of the micro-scale PP/PET fibers was well correlated to the size of the nano-scale PET fibers formed in the PP matrix. The visualization results revealed that a smaller fibril diameter was obtainable by increasing the stretching on the spin line and/or decreasing the die swell. Note de contenu : - EXPERIMENTAL : Materials - Rheological measurements - Fiber spinning setup - Scanning electron microscopy (SEM) and optical microscope - In situ visualization of the die swell phenomenon - RESULTS AND DISCUSSION : In situ visualization of macroscopic fibrillation of PP/PET fibers at die exit - Investigation of the collected PP/PET microfibrils - Investigation of pet nanofibrils formed within the PP/PET microfibril - Correlation between the PP/PET microfibril size and the pet nanofibril size DOI : https://doi.org/10.1515/ipp-2020-4072 En ligne : https://drive.google.com/file/d/1PQEzJCBqaEWmWWTzTat875yHMb-Pl-W2/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36375 [article]

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