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

被引:10
作者
Azevedo, Juliana V. C. [1 ,2 ,3 ,4 ]
Ramakers-van Dorp, Esther [2 ]
Grimmig, Roman [2 ]
Hausnerova, Berenika [1 ,4 ]
Moeginger, Bernhard [2 ]
机构
[1] Tomas Bata Univ Zlin, Fac Technol, Vavreckova 275, Zlin 76001, Czech Republic
[2] Univ Appl Sci Bonn Rhein Sieg, Dept Nat Sci, Liebig Str 20, D-53359 Rheinbach, Germany
[3] Branch AKRO Plast GmbH, BIO FED, BioCampus Cologne,Nattermannallee 1, D-50829 Cologne, Germany
[4] Tomas Bata Univ Zlin, Univ Inst, Ctr Polymer Syst, Nam TG Masaryka 5555, Zlin 76001, Czech Republic
关键词
poly(butylene adipate terephthalate); poly(lactic acid); chain-extending cross-linker; process-induced morphology; blown film extrusion; MECHANICAL-PROPERTIES; POLY(LACTIC ACID); ADIPATE-CO-TEREPHTHALATE); BLENDS; BIODEGRADATION; DEGRADATION;
D O I
10.3390/polym14101939
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Process-induced changes in the morphology of biodegradable polybutylene adipate terephthalate (PBAT) and polylactic acid (PLA) blends modified with various multifunctional chain-extending 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.
引用
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页数:11
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