Bio-Based PLA/NR-PMMA/NR Ternary Thermoplastic Vulcanizates with Balanced Stiffness and Toughness: “Soft–Hard” Core–Shell Continuous Rubber Phase, In Situ Compatibilization, and Properties,ACS Sustainable Chemistry & Engineering

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Bio-Based PLA/NR-PMMA/NR Ternary Thermoplastic Vulcanizates with Balanced Stiffness and Toughness: “Soft–Hard” Core–Shell Continuous Rubber Phase, In Situ Compatibilization, and Properties
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-03-27 00:00:00 , DOI: 10.1021/acssuschemeng.8b00267
Yukun Chen ₁ , Wentao Wang ₁ , Daosheng Yuan ₁ , Chuanhui Xu _{1,

2} , Liming Cao ₁ , Xingquan Liang ₂

Affiliation

Stiffness and toughness are two mutually exclusive attributes of polymer materials that contribute to significant improvements in impact strength, usually accompanied by a reduction in tensile strength. In this study, ternary thermoplastic vulcanizates (TPVs) consisting of poly(lactic acid) (PLA), poly(methyl methacrylate)-grafted natural rubber (NR-PMMA), and natural rubber (NR) with balanced stiffness and toughness were successfully prepared via peroxide-induced dynamic vulcanization. With 10 wt% of NR and NR-PMMA, the PLA/NR-PMMA/NR ternary TPV displayed an enhanced yield stress of 41.7 MPa (only 38% loss compared to neat PLA) and a significantly higher impact strength of 91.30 kJ/m² (nearly 32 times that of neat PLA). The in situ compatibilization between PLA and rubber phases was confirmed by Fourier transform infrared spectroscopy. Interfacial, rheological, and calorimetric measurements confirmed that the NR was encapsulated by NR-PMMA in the PLA phase. It was found that the flexibility of the “soft” NR core and outer “hard” NR-PMMA shell with excellent PLA/rubber interfacial adhesion are responsible for the super toughness and considerable tensile strength of the PLA/NR-PMMA/NR ternary TPVs.

中文翻译：

具有平衡刚度和韧性的生物基PLA / NR-PMMA / NR三元热塑性硫化橡胶：“软-硬”核-壳连续橡胶相，原位相容性和性能

刚度和韧性是聚合物材料的两个相互排斥的属性，它们有助于显着提高冲击强度，通常伴随着拉伸强度的降低。在这项研究中，成功地制备了由聚乳酸（PLA），聚甲基丙烯酸甲酯接枝的天然橡胶（NR-PMMA）和具有平衡的刚度和韧性的天然橡胶（NR）组成的三元热塑性硫化橡胶（TPV）。通过过氧化物引起的动态硫化。使用10 wt％的NR和NR-PMMA，PLA / NR-PMMA / NR三元TPV的屈服应力提高了41.7 MPa（与纯PLA相比仅损失了38％），冲击强度明显提高了91.30 kJ / m ^2个（几乎是纯PLA的32倍）。PLA和橡胶相之间的原位相容性通过傅立叶变换红外光谱法得到证实。界面，流变学和量热法测量结果证实，NR被NR-PMMA包裹在PLA相中。发现“软” NR核和“硬” NR-PMMA外壳的柔韧性以及优异的PLA /橡胶界面粘合性决定了PLA / NR-PMMA / NR三元TPV的超韧性和相当大的拉伸强度。

更新日期：2018-03-27

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