title: Fully biobased and supertough polylactide-based thermoplastic vulcanizates fabricated by peroxide-induced dynamic vulcanization and interfacial compatibilization.
abstract: 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/m(3) and 586.6 J/m, respectively, compared to those of 3.2 MJ/m(3) 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.
authors.affiliation: Center for Degradable and Flame-Retardant Polymeric Materials, College of Chemistry, State Key Laboratory of Polymer Materials Engineering, National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), Sichuan University , Chengdu 610064, China.
authors.forename: Guang-Chen
authors.initials: GC
authors.lastname: Liu
authors.forename: Yi-Song
authors.initials: YS
authors.lastname: He
authors.forename: Jian-Bing
authors.initials: JB
authors.lastname: Zeng
authors.forename: Qiu-Tong
authors.initials: QT
authors.lastname: Li
authors.forename: Yu-Zhong
authors.initials: YZ
authors.lastname: Wang
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D063566:Biodegradable Plastics / Q000737:chemistry*; D020724:Elastomers / Q000737:chemistry; D010545:Peroxides / Q000737:chemistry*; D011091:Polyesters / Q000737:chemistry*
chemical_list: D001672:Biocompatible Materials; D063566:Biodegradable Plastics; D020724:Elastomers; D010545:Peroxides; D011091:Polyesters; C033616:poly(lactide)