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Manufacturing of Blends based on Biopolyesters and Polylactides: Process-induced Structure and Properties

  • Process-induced changes in thermo-mechanical viscoelastic properties and the corresponding morphology of biodegradable polybutylene adipate terephthalate (PBAT) and polylactic acid (PLA) blown film blends modified with four multifunctional chain-extending cross-linkers (CECL) were investigated. The introduction of CECL modified the properties of the reference PBAT/PLA blend significantly. The thermal analysis showed that the chemical reactions were incomplete after compounding, and that film blowing extended them. SEM investigations of the fracture surfaces of blown extrusion films reveal the significant effect of CECL on the morphology formed during the processing. The anisotropic morphology introduced during film blowing proved to affect the degradation processes as well. Furthermore, the reactions of CECL with PBAT/PLA induced by the processing depend on the deformation directions. The blow-up ratio parameter was altered to investigate further process-induced changes proving synergy with mechanical and morphological features. Using blown film extrusion, the elongational behavior represents a very important characteristic. However, its evaluation may be quite often problematic, but with the SER Universal Testing Platform it was possible to determine changes in the duration of time intervals corresponding to the rupture of elongated samples.

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Document Type:Doctoral Thesis
Author:Juliana Vanessa Cardoso Azevedo
Title translated (Czech):Zpracování PBAT/PLA směsí: vliv procesních podmínek na strukturní a užitné vlastnosti
Referee:Berenika Hausnerová, Bernhard Möginger
Place of publication:Zlin
Contributing Corporation:Tomas Bata University
Publication year:2024
Copyright:© Juliana Vanessa Cardoso Azevedo
Keyword:blown film extrusion; chain extender cross-linker; compost disintegration; morphology; poly(butylene adipate-co-terephthalate); poly(lactic acid); process-induced structure; thermo-mechanical properties
Departments, institutes and facilities:Fachbereich Angewandte Naturwissenschaften
Dewey Decimal Classification (DDC):6 Technik, Medizin, angewandte Wissenschaften / 62 Ingenieurwissenschaften / 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten
Entry in this database:2024/03/21