Abstract The thermoplastic vulcanizates (TPVs) of Polylactide (PLA)/Epoxidized natural rubber (ENR) were prepared by dynamic vulcanization technology. The processing torque, crosslink density, morphology of PLA/ENR blends, and PLA's molecular weight during the processing were investigated by HAAKE rheometer, swelling measurement, scanning electron microscopy (SEM), and gel permeation chromatography (GPC). It was found that the vulcanization of ENR completed at the turning point after torque peak. After the turning point, the torque and crosslink density decreased with the processing time increasing. Moreover, the morphology of PLA/ENR blends showed bi-continuous structure during the dynamic vulcanization processing, and the phase size of PLA/ENR was increased with processing time and temperature. GPC results showed PLA degradation mainly happened after torque turning point. Thermal gravimetric analysis (TGA) results indicated that some parts of PLA would graft on ENR during processing, and the higher the processing temperature, the more the PLA was grafted.

中文翻译：

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动态硫化过程中生物基PLA/ENR热塑性硫化胶的结构演变

摘要 采用动态硫化技术制备了聚乳酸（PLA）/环氧化天然橡胶（ENR）的热塑性硫化橡胶（TPVs）。通过 HAAKE 流变仪、溶胀测量、扫描电子显微镜 (SEM) 和凝胶渗透色谱 (GPC) 研究了加工过程中的加工扭矩、交联密度、PLA/ENR 共混物的形态和 PLA 的分子量。发现ENR的硫化在扭矩峰值后的转折点完成。在转折点之后，扭矩和交联密度随着加工时间的增加而降低。此外，PLA/ENR 共混物的形态在动态硫化过程中表现出双连续结构，PLA/ENR 的相尺寸随着加工时间和温度的增加而增加。GPC 结果表明 PLA 降解主要发生在扭矩转折点之后。热重分析(TGA)结果表明，PLA在加工过程中的某些部分会接枝在ENR上，加工温度越高，PLA接枝的越多。