Fully Biobased and Supertough Polylactide-Based Thermoplastic Vulcanizates Fabricated by Peroxide-Induced Dynamic Vulcanization and Interfacial Compatibilization

A fully biobased and supertough thermoplastic vulcanizate (TPV) consisting of polylactide (PLA) and a biobased vulcanized unsaturated aliphatic polyester elastomer (UPE) was fabricated via peroxide-induced dynamic vulcanization. Interfacial compatibilization between PLA and UPE took place during dyn...

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Bibliographic Details
Published in:Biomacromolecules 2014-11, Vol.15 (11), p.4260-4271
Main Authors: Liu, Guang-Chen, He, Yi-Song, Zeng, Jian-Bing, Li, Qiu-Tong, Wang, Yu-Zhong
Format: Article
Language:English
Subjects:
Applied sciences
Biocompatible Materials - chemistry
Biodegradable Plastics - chemistry
Elastomers - chemistry
Exact sciences and technology
Organic polymers
Peroxides - chemistry
Physicochemistry of polymers
Polycondensation
Polyesters - chemistry
Preparation, kinetics, thermodynamics, mechanism and catalysts
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Summary:A fully biobased and supertough thermoplastic vulcanizate (TPV) consisting of polylactide (PLA) and a biobased vulcanized unsaturated aliphatic polyester elastomer (UPE) was fabricated via peroxide-induced dynamic vulcanization. Interfacial compatibilization between PLA and UPE took place during dynamic vulcanization, which was confirmed by gel measurement and NMR analysis. After vulcanization, the TPV exhibited a quasi cocontinuous morphology with vulcanized UPE compactly dispersed in PLA matrix, which was different from the pristine PLA/UPE blend, exhibiting typically phase-separated morphology with unvulcanized UPE droplets discretely dispersed in matrix. The TPV showed significantly improved tensile and impact toughness with values up to about 99.3 MJ/m3 and 586.6 J/m, respectively, compared to those of 3.2 MJ/m3 and 16.8 J/m for neat PLA, respectively. The toughening mechanisms under tensile and impact tests were investigated and deduced as massive shear yielding of the PLA matrix triggered by internal cavitation of VUPE. The fully biobased supertough PLA vulcanizate could serve as a promising alternative to traditional commodity plastics.
ISSN:1525-7797
1526-4602
DOI:10.1021/bm5012739