Fabrication of polypropylene blends with excellent low-temperature toughness and balanced toughness-rigidity by a combination of EPR and SEEPS
Fabrication of polypropylene blends with excellent low-temperature toughness and balanced toughness-rigidity by a combination of EPR and SEEPS
复制标题
EPR与SEEPS结合制备低温韧性优异、韧刚平衡的聚丙烯共混物
DOI：
10.1002/app.45714
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发表时间：
2018
影响因子：
3
通讯作者：
Zheng Qiang
中科院分区：
文献类型：
--
作者：
Jia Erwen;Shangguan Yonggang;Xiong Junwen;Chen Feng;Zheng Qiang
为了克服橡胶增韧塑料刚性下降严重的问题，制备刚性-韧性平衡的热塑性塑料，采用苯乙烯-[乙烯-（乙烯-丙烯）]-苯乙烯嵌段共聚物（SEEPS）和乙丙橡胶（EPR）复合增韧聚丙烯。研究了聚丙烯（PP）/乙丙橡胶（EPR）/SEEPS共混物的动态力学性能、结晶熔融行为和力学性能。结果表明，SEEPS和EPR的组合可以实现低温韧性的巨大改善，而没有显着的强度和刚度损失。动态力学性能和相形态研究结果表明，SEEPS具有良好的界面强度，并增加了由EPR组分和EP结构域组成的复合橡胶相的损失。与PP/EPR二元共混物相比，PP/EPR/SEEPS共混物的橡胶相玻璃化转变温度（Tg）和PP基体玻璃化转变温度（Tg）均未降低，但其脆坚韧转变温度（Tbd）却有所降低，表明增强PP基体与复合橡胶相之间的界面相互作用也是降低共混物Tbd从而提高低温韧性的有效途径。PP/EPR/SEEPS共混体系的刚性与韧性平衡归因于EPR和SEEPS对PP增韧的协同效应。© 2017 Wiley Periodicals，Inc. J.应用聚合物Sci.2018，135，45714.
To overcome serious rigidity depression of rubber‐toughened plastics and fabricate a rigidity‐toughness balanced thermoplastic, a combination of styrene‐[ethylene‐(ethylene‐propylene)]‐styrene block copolymer (SEEPS) and ethylene‐propylene rubber (EPR) was used to toughen polypropylene. The dynamic mechanical properties, crystallization and melting behavior, and mechanical properties of polypropylene (PP)/EPR/SEEPS blends were studied in detail. The results show that the combination of SEEPS and EPR can achieve the tremendous improvement of low‐temperature toughness without significant strength and rigidity loss. Dynamic mechanical properties and phase morphology results demonstrate that there is a good interfacial strength and increased loss of compound rubber phase comprised of EPR component and EP domain of SEEPS. Compared with PP/EPR binary blends, although neither glass transition temperature (Tg) of the rubber phase norTgof PP matrix in PP/EPR/SEEPS blends decreases, the brittle‐tough transition temperature (Tbd) of PP/EPR/SEEPS blends decreases, indicating that the increased interfacial interaction between PP matrix and compound rubber phase is also an effective approach to decreaseTbdof the blends so as to improve low‐temperature toughness. The balance between rigidity and toughness of PP/EPR/SEEPS blends is ascribed to the synergistic effect of EPR and SEEPS on toughening PP. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci.2018,135, 45714.