title: Supertoughened Biobased Poly(lactic acid)-Epoxidized Natural Rubber Thermoplastic Vulcanizates: Fabrication, Co-continuous Phase Structure, Interfacial in Situ Compatibilization, and Toughening Mechanism.
abstract: In the presence of dicumyl peroxide (DCP), biobased thermoplastic vulcanizates (TPVs) composed of poly(lactic acid) (PLA) and epoxidized natural rubber (ENR) were prepared through dynamic vulcanization. Interfacial in situ compatibilization between PLA and ENR phases was confirmed by Fourier transform infrared spectroscopy (FT-IR). A novel "sea-sea" co-continuous phase in the PLA/ENR TPVs was observed through scanning electron microscopy (SEM) and differed from the typical "sea-island" morphology that cross-linked rubber particles dispersed in plastic matrix. A sharp, brittle-ductile transition occurred with 40 wt % of ENR, showing a significantly improved impact strength of 47 kJ/m(2), nearly 15 times that of the neat PLA and 2.6 times that of the simple blend with the same PLA/ENR ratio. Gel permeation chromatography (GPC) and dynamic mechanical analysis (DMA) results suggested that a certain amount of DCP was consumed in the PLA phase, causing a slight cross-linking or branching of PLA molecules. the effects of various DCP contents on the impact property were investigated. The toughening mechanism under impact testing was researched, and the influence factors for toughening were discussed.
authors: The Key Laboratory of Polymer Processing Engineering, Ministry of Education, South China University of Technology , Guangzhou, 510640 China.
authors: Youhong
authors: Y
authors: Wang
authors: The Key Laboratory of Polymer Processing Engineering, Ministry of Education, South China University of Technology , Guangzhou, 510640 China.
authors: Kunling
authors: K
authors: Chen
authors: The Key Laboratory of Polymer Processing Engineering, Ministry of Education, South China University of Technology , Guangzhou, 510640 China.|School of Chemistry and Chemical Engineering, Guangxi University , Nanning, 530004 China.
authors: Chuanhui
authors: C
authors: Xu
authors: The Key Laboratory of Polymer Processing Engineering, Ministry of Education, South China University of Technology , Guangzhou, 510640 China.
authors: Yukun
authors: Y
authors: Chen
mesh_terms: D001593:Benzyl Compounds / Q000737:chemistry; D004852:Epoxy Compounds / Q000737:chemistry*; D019344:Lactic Acid / Q000737:chemistry*; D055595:Mechanical Phenomena; D011091:Polyesters; D011108:Polymers / Q000737:chemistry*; D012408:Rubber / Q000737:chemistry*; D013696:Temperature
chemical_list: D001593:Benzyl Compounds; D004852:Epoxy Compounds; D011091:Polyesters; D011108:Polymers; D019344:Lactic Acid; C033616:poly(lactide); D012408:Rubber; C037517:dicumyl peroxide