Bio-based thermoplastic vulcanizates (TPV) from poly(lactide) (PLA) and ethylene-co-vinyl acetate rubber (EVA) were fabricated using dicumyl peroxide (DCP) as a curing agent; it is the first time that the application of PLA in elastic materials is demonstrated. A two-stage competing reaction mechanism as a function of peroxide content is revealed via gel analysis. The crosslinking of EVA is dominant at low DCP content (<1 wt%), which levels off when the DCP content exceeds 1 wt%. The gel fractions of the EVA and PLA phases can be tuned by the DCP content and fabrication technique. A desirable phase inversion of the PLA/EVA blends due to selective dynamic curing was monitored by both atomic force microscopy (AFM) and dynamic mechanical analysis (DMA). Consequently, PLA/EVA thermoplastic vulcanizates with high strength, high elongation at break, low tensile set and intermediate hardness were obtained. Moreover, their mechanical properties can be tuned by the DCP content and plasticization. The correlation between their structures and properties was investigated.

中文翻译：

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动态交联的 生物基聚（丙交酯）/乙烯-共-乙酸乙烯酯热塑性硫化橡胶：结构与性能

使用过氧化二枯基（DCP）作为固化剂，由聚丙交酯（PLA）和乙烯-乙酸乙烯酯共聚橡胶（EVA）制成生物基热塑性硫化橡胶（TPV）；这是首次证明PLA在弹性材料中的应用。通过过氧化氢揭示了两阶段竞争反应机理与过氧化物含量的关系凝胶分析。EVA的交联在低DCP含量（<1 wt％）时占主导地位，当DCP含量超过1 wt％时趋于稳定。EVA和PLA相的凝胶分数可以通过DCP含量和制造技术进行调整。通过原子力显微镜（AFM）和动态力学分析（DMA）监控了由于选择性动态固化而产生的理想PLA / EVA共混物的相转化。因此，获得了具有高强度，高断裂伸长率，低拉伸永久变形和中等硬度的PLA / EVA热塑性硫化橡胶。而且，它们的机械性能可以通过DCP含量和增塑来调整。研究了它们的结构和性质之间的相关性。