Vermiculite (VMT) grafted polyisoprene (PIP) (VMT-g-PIP) was synthesized by thiol-ene click chemistry. An orthogonal experiment and range analysis showed that the optimum reaction parameters of VMT-g-PIP were as follows: reaction time 9 h, reaction temperature 60 °C, initiator azodiisobutyronitrile dosage 0.025 g and mass ratio of isoprene to VMT-SH 3:1. Due to the strong interfacial compatibility between poly(lactic acid) (PLA) and VMT-g-PIP, the impact strength and elongation at break of PLA/VMT-g-PIP (0.7 wt%) nanocomposites were increased by 1.33 and 5.20 times, respectively, compared with pure PLA. Thermogravimetric analysis and cone calorimeter analysis demonstrated that the thermal stability and fire resistance effect of PLA/VMT-g-PIP nanocomposites had been improved to a certain extent. Differential scanning calorimetry and Rheonaut technology for simultaneous rheometry and Fourier transform infrared spectroscopy demonstrated that the synergistic effect of shear field and heterogeneous nucleation of VMT-g-PIP induced faster crystallization of PLA. Accordingly, the crystallization properties of PLA were clearly improved, which enhanced its toughness. Enzymatic degradation behavior showed that VMT-g-PIP inhibited the biodegradation of PLA to a certain extent. © 2021 Society of Industrial Chemistry.

中文翻译：

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基于硫醇-烯点击化学的聚乳酸/蛭石-g-聚异戊二烯纳米复合材料：性能、剪切结晶和Rheonaut技术分析

蛭石 (VMT) 接枝聚异戊二烯 (PIP) (VMT- g - PIP)通过硫醇-烯点击化学合成。正交试验和极差分析表明，VMT- g- PIP的最佳反应参数为：反应时间9h，反应温度60℃，引发剂偶氮二异丁腈用量0.025g，异戊二烯与VMT-SH的质量比为3:1 . 由于聚乳酸 (PLA) 和 VMT- g- PIP之间的强界面相容性，PLA/VMT- g的冲击强度和断裂伸长率与纯 PLA 相比，-PIP (0.7 wt%) 纳米复合材料分别增加了 1.33 和 5.20 倍。热重分析和锥形量热分析表明，PLA/VMT- g- PIP纳米复合材料的热稳定性和耐火效果得到了一定程度的提高。差示扫描量热法和 Rheonaut 技术同时进行流变测量和傅里叶变换红外光谱表明，VMT- g- PIP的剪切场和异相成核的协同效应诱导了 PLA 的更快结晶。因此，PLA的结晶性能明显改善，增强了其韧性。酶促降解行为表明 VMT- g-PIP在一定程度上抑制了PLA的生物降解。© 2021 工业化学学会。