The role of extrusion conditions on the mechanical properties of thermoplastic protein / Casparus Johannes Reinhard Verbeek in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIII, N° 2 (05/2018)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXIII, N° 2 (05/2018) . - p. 180-190 Titre : The role of extrusion conditions on the mechanical properties of thermoplastic protein Type de document : texte imprimé Auteurs : Casparus Johannes Reinhard Verbeek, Auteur ; S. C. P. Izuchukwu, Auteur ; J. M. Bier, Auteur Année de publication : 2018 Article en page(s) : p. 180-190 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse mécanique dynamique Diffraction des rayons X à grand angle Fourier, Spectroscopie infrarouge à transformée de Polymères -- Teneur en eau Résistance à la traction Thermoplastiques -- Extrusion Thermoplastiques -- Propriétés mécaniques Index. décimale : 668.4 Plastiques, vinyles Résumé : Mechanical properties of Novatein thermoplastic protein compounded at different extrusion temperatures and processing water contents have been examined in a factorial experiment. Thermoplastic proteins are moisture sensitive and can be prone to thermal degradation during processing. Processing water was varied between 30 and 45 parts per hundred parts bloodmeal while the extrusion temperature was varied between 120 and 150 °C to identify a processing window suitable for process scale up. To resolve any effects processing water had on protein-protein interactions from its plasticising effect, injection molded specimens were mechanically tested both as molded and after conditioning at controlled temperature and humidity. Despite all conditioned samples having approximately the same moisture content, mechanical properties were different. Tensile strength and modulus decreased with increasing processing water at the same equilibrium moisture content. DMA and WAXS suggested this was due to changes in chain mobility within the amorphous phase of the material, rather than conformational change towards a more ordered state. Properties of unconditioned specimens were mostly dependent on the plasticising effect of different amounts of processing water remaining in the material after injection molding. Extrusion temperature had very little effect on mechanical properties, suggesting that Novatein is robust enough to handle some temperature variations during processes such as injection molding. Note de contenu : - Moisture content - Mechanical properties - Mechanical properties without conditioning - Mechanical properties after conditioning - Wide angle X-ray scattering (WAXS) - Dynamic Mechanical Analysis - Thermally resolved synchrotron (FT-IR) DOI : 10.3139/217.3391 En ligne : https://drive.google.com/file/d/1faFy5nOjK1hm-w0hAa1PotUd0vAWalk5/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30566 [article]

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