Stress optical behavior and structure development in melt spun PEEK/PEI blends / R. Ozisik in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIII, N° 3 (07/2018)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXIII, N° 3 (07/2018) . - p. 425-434 Titre : Stress optical behavior and structure development in melt spun PEEK/PEI blends Type de document : texte imprimé Auteurs : R. Ozisik, Auteur ; Miko Cakmak, Auteur Année de publication : 2018 Article en page(s) : p. 425-434 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) Calorimétrie Diffraction des rayons X à grand angle Extrusion filage Fibres textiles -- Propriétés mécaniques Fibres textiles synthétiques Mélanges de fibres Microscopie Polyéther éther cétone Polyéther imide Production Index. décimale : 668.4 Plastiques, vinyles Résumé : Stress optical behavior as influenced by blend composition has been investigated by on–line stress monitoring during melt spinning of a series of melt miscible PEEK/PEI blends. At low stresses/draw downratios, the fibers are found to be amorphous. In this range, the linear stress optical rule is obeyed and stress optical constant was found to be composition dependent. Beyond a critical drawdown, the PEEK chains first form very highly oriented ordered domains that exhibit significant translational disorder along the fiber axis. In the processing range observed, this structure persists even at high spinline deformation/stresses. While the stress optical behavior remains linear for those compositions where no stress crystallization was detected, negative deviation from initial linearity was observed when these ordered PEEK regions began to be observed indicating that birefringence saturation is approached while stresses are increased. Note de contenu : - MATERIALS AND EXPERIMENTAL METHODS : Blend preparation - Fiber production - Differential scanning calorimeter - Optical microscopy - Wide angle X-ray scattering - Mechanical properties - RESULTS : Thermal properties - Evolution of structure - Birefringence and spinline stress - Wide angle X-ray scattering - Mechanical properties - DISCUSSION : Birefringence and orientation - Wide angle X-ray scattering - Mechanical properties DOI : 10.3139/217.3655 En ligne : https://drive.google.com/file/d/1Oqe8o049fhHqXyqPaCMluiTlOQLt1PZ9/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30811 [article]

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Synergistic material extrusion 3D-printing using core–shell filaments containing polycarbonate-based material with different glass transition temperatures and viscosities / Fang Peng in INTERNATIONAL POLYMER PROCESSING, Vol. 37, N° 4 (2022)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 37, N° 4 (2022) . - p. 406-414 Titre : Synergistic material extrusion 3D-printing using core–shell filaments containing polycarbonate-based material with different glass transition temperatures and viscosities Type de document : texte imprimé Auteurs : Fang Peng, Auteur ; Bryan D. Vogt, Auteur ; Miko Cakmak, Auteur Année de publication : 2022 Article en page(s) : p. 406-414 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Etat fondu (matériaux) Filaments Fibre de longueur infinie ou extrême comme celle qu'on trouve dans la soie à l'état naturel. Les fibres manufacturées sont extrudées en filaments qui sont transformés en fils continus, en fibres courtes ou en câbles. Impression tridimensionnelle Matières plastiques -- Extrusion Matières plastiques -- Propriétés mécaniques Polycarbonates Index. décimale : 668.4 Plastiques, vinyles Résumé : The application of 3D printing of thermoplastics by Material Extrusion (MatEx) has commonly been limited by their poor mechanical strength that results from voids and weak interfaces between printed layers. Here, we demonstrate that core–shell structured filaments made of polycarbonate-based thermoplastics can achieve synergistic improvement in their interfacial bonding from the combination of high-glass transition temperature (T g)/high-viscosity core and low-T g/low-viscosity shell. Tensile strength along the printing direction was enhanced with the core–shell filaments. Layer-interfacial bonding strength as determined by Izod impact tests of the 3D printed parts is significantly improved by using filaments either with only a core–shell T g mismatch or both T g/viscosity core–shell mismatch. The mechanical behavior can be rationalized in terms of improved inter-layer molecule diffusion by a low T g/viscosity shell, better printability at higher temperature due to the core with higher melt strength, and better bulk mechanical strength of high-viscosity/T g core. Note de contenu : - EXPERIMENTAL : Filament extrusion - 3D printing - Characterization - RESULTS AND DISCUSSION : Material properties - Core-shell structure - Tensile properties - Table 1 : Temperature profile for filament extrusion using Rheomex 252p. - Table 2 : Temperature profile for filament extrusion using M-PAK125 - Table 3 : Temperature profile for filament co-Extrusion DOI : https://doi.org/10.1515/ipp-2022-4217 En ligne : https://drive.google.com/file/d/1t-UNX1-sKaib9Np8EPRGlMqfrDgCAjXm/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37916 [article]

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