Toughening polylactide by dynamic vulcanization with castor oil and different types of diisocyanates
Toughening polylactide by dynamic vulcanization with castor oil and different types of diisocyanates
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用蓖麻油和不同类型的二异氰酸酯动态硫化增韧聚丙交酯
DOI：
10.1016/j.polymertesting.2017.03.009
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发表时间：
2017-05
期刊：
影响因子：
5.1
通讯作者：
Zeng Jian-Bing
中科院分区：
文献类型：
--
作者：
He Yan;Zhao Tong-Hui;Li Yi-Dong;Wang Ming;Zeng Jian-Bing
采用4，4 ′-二苯基甲烷二异氰酸酯（MDI）、异佛尔酮二异氰酸酯（IPDI）和蓖麻油（CO）3种二异氰酸酯对聚乳酸（PLA）进行动态硫化，研究了不同二异氰酸酯对PLA/CO聚氨酯共混物的形态结构和力学性能的影响。三种二异氰酸酯与蓖麻油反应的活性顺序为MDI > HDI > IPDI。当使用反应性较低的HDI和IPDI时，PLA和CO基聚氨酯之间发生界面增容。在所有共混物中，PLA/CO-IPDI表现出最细的形态和最好的增韧效果。加入20wt%的CO-IPDI可使PLA的断裂伸长率和缺口冲击强度分别提高47.3倍和6.6倍。聚乳酸与钴基聚氨酯共混物的增韧机制是空泡诱导的基体塑性变形。详细研究了CO-IPDI含量对聚乳酸的形态结构和力学性能的影响。随着CO-IPDI含量从5wt%增加到30wt%，分散态CO-IPDI的粒径和断裂伸长率逐渐增大，拉伸强度和杨氏模量逐渐减小，冲击强度先增大后减小。当共混物中CO-IPDI含量为20wt%时，冲击强度最大。
Dynamic vulcanization of polylactide (PLA) with castor oil (CO) and three different diisocyanates, namely 4,4′-diphenylmethane diisocyanate (MDI), hexamethylene diisocyanate (HDI) and isophorone diisocyanate (IPDI), was performed to study the effect of diisocyanate type on the vulcanization process and on the morphology as well as mechanical properties of the PLA/CO-based polyurethane blends. The reactivity of the three diisocyanate followed the order of MDI > HDI > IPDI when reacting with castor oil. Interfacial compatibilization between PLA and the CO-based polyurethane occurred when the less reactive HDI and IPDI was used. Among all the blends, PLA/CO-IPDI showed the finest morphology and the best toughening efficiency. Incorporation of 20 wt% CO-IPDI increased the elongation at break and notched impact strength of PLA by 47.3 and 6.6 times, respectively. Cavitation induced matrix plastic deformation was observed as the toughening mechanism for the PLA blends with CO-based polyurethane. The effect of CO-IPDI content on the morphology and mechanical properties of PLA was studied in detail. The particle size of dispersed CO-IPDI and the elongation at break increased gradually, the tensile strength and Young's modulus decreased gradually, while the impact strength first increased and then decreased with increasing CO-IPDI content from 5 to 30 wt%. The maximum impact strength appeared for the blends with 20 wt% CO-IPDI.
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影响因子：
4.2
作者：
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通讯作者：
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通讯作者：
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影响因子：
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作者：
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