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Process-Induced Morphology of Poly(Butylene Adipate Terephthalate)/Poly(Lactic Acid) Blown Extrusion Films Modified with Chain-Extending Cross-Linkers

  • Process-induced changes in the morphology of biodegradable polybutylene adipate terephthalate (PBAT) and polylactic acid (PLA) blends modified with various multifunctional chainextending cross-linkers (CECLs) are presented. The morphology of unmodified and modified films produced with blown film extrusion is examined in an extrusion direction (ED) and a transverse direction (TD). While FTIR analysis showed only small peak shifts indicating that the CECLs modify the molecular weight of the PBAT/PLA blend, SEM investigations of the fracture surfaces of blown extrusion films revealed their significant effect on the morphology formed during the processing. Due to the combined shear and elongation deformation during blown film extrusion, rather spherical PLA islands were partly transformed into long fibrils, which tended to decay to chains of elliptical islands if cooled slowly. The CECL introduction into the blend changed the thickness of the PLA fibrils, modified the interface adhesion, and altered the deformation behavior of the PBAT matrix from brittle to ductile. The results proved that CECLs react selectively with PBAT, PLA, and their interface. Furthermore, the reactions of CECLs with PBAT/PLA induced by the processing depended on the deformation directions (ED and TD), thus resulting in further non-uniformities of blown extrusion films.

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Document Type:Article
Author:Juliana V. C. Azevedo, Esther Ramakers-van Dorp, Roman Grimmig, Berenika Hausnerova, Bernhard Möginger
Parent Title (English):Polymers
Article Number:1939
Number of pages:11
Publishing Institution:Hochschule Bonn-Rhein-Sieg
Date of first publication:2022/05/10
Copyright:© 2022 by the authors. This article is an open access article distributed under the terms andconditions of the Creative Commons Attribution (CC BY) license.
Funding:The author B.H. acknowledges the Ministry of Education, Youth and Sports of the Czech Republic - DKRVO (RP/CPS/2022/003).
Keyword:blown film extrusion; chain-extending cross-linker; poly(butylene adipate terephthalate); poly(lactic acid); process-induced morphology
Departments, institutes and facilities:Fachbereich Angewandte Naturwissenschaften
Institut für Technik, Ressourcenschonung und Energieeffizienz (TREE)
Dewey Decimal Classification (DDC):5 Naturwissenschaften und Mathematik / 54 Chemie / 540 Chemie und zugeordnete Wissenschaften
Entry in this database:2022/05/19
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International