Morphology development and superior mechanical properties of PP/PA6/SEBS ternary blends compatibilized by using a highly efficient multi-phase compatibilizer
Morphology development and superior mechanical properties of PP/PA6/SEBS ternary blends compatibilized by using a highly efficient multi-phase compatibilizer
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使用高效多相增容剂增容 PP/PA6/SEBS 三元共混物的形态发展和优异的机械性能
DOI：
10.1016/j.polymer.2016.11.044
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发表时间：
2017-01-13
期刊：
影响因子：
4.6
通讯作者：
Xie, Xu-Ming
中科院分区：
文献类型：
--
作者：
Li, Huanmin;Xie, Xu-Ming
多相相容剂不仅在制备高性能的三元或多相不相容聚合物共混物方面具有潜在的吸引力，而且在废塑料混合物的回收利用方面也具有潜在的吸引力。本研究制备了马来酸酐(MAH)和苯乙烯(St)双单体接枝PP，PP-g-(MAH-co-St)作为多相增容剂，对PP/PA6/SEBS(70/15/15)三元共混物表现出高效的增容作用。扫描电子显微镜(SEM)显示，随着相容剂用量的增加，PA6的形态由SEBS包覆的单个PA6粒子演变为部分SEBS包覆的多个较小尺寸的PA6粒子，然后演变为分散在PP中的细小的PA6粒子和一些较大尺寸的SEBS聚集体。由扩展系数预测的形貌发展与扫描电子显微镜观察到的形貌发展完全一致。此外，良好的相容性和相应的形态使力学性能得到了极大的提高。与未增容共混物相比，加入15wt多相增容剂的共混物力学性能最好，屈服应力、断裂应力、断裂应变和冲击破坏能分别提高了23%、132%、647%和220%。结果表明，SEBS(0.5~0.7µm)部分包覆了PA6小颗粒(03~0.4µm)的微区，对提高共混物的力学性能非常有效。为了提高共混物的力学性能，SEBS包裹的大尺寸PA6粒子和细小的PA6粒子以及分散在PP中的一些大尺寸的SEBS聚集体的形态非常有限。因此，增强界面相互作用和刚性粒子的形态对于三元共混物来说是至关重要的。(C)2016爱思唯尔有限公司。保留所有权利。
Multi-phase compatibilizers are potentially attractive, not only for the preparation of ternary or multi-phase immiscible polymer blends with high performance, but also for recycling and reuse of waste plastics mixture. In this study, the maleic anhydride (MAH) and styrene (St) dual monomers grafted PP, PP-g-(MAH-co-St) is prepared as a multi-phase compatibilizer, which exhibits highly effective compatibility on the PP/PA6/SEBS (70/15/15) ternary blends. Scanning electron microscopy (SEM) reveals that, with increasing the compatibilizer, the morphology evolves from the individual PA6 particle encapsulated by SEBS to several smaller-size PA6 particles partially encapsulated by SEBS phase, then to the tiny PA6 particles and some larger-size SEBS agglomerates predominantly dispersed separately in PP matrix. The morphology development predicted by spreading coefficients shows a consummate consistency with that observed by SEM. Moreover, the good compatibilization and corresponding morphologies result in superior enhancement of mechanical properties. Compared to the uncompatibilized blend, adding 15 wt multi-phase compatibilizer to the blend leads to the best mechanical properties with the yield stress, stress at break, strain at break and impact failure energy improved significantly by 23%, 132%, 647% and 220%, respectively. The results verify that the domains with small-size PA6 particles (03-0.4 mu m) partially encapsulated by SEBS (0.5-0.7 mu m) in PP matrix are very effective to enhance the mechanical properties of the blends. The morphologies of large-size PA6 particles encapsulated by SEBS or tiny PA6 particles and some larger-size SEBS agglomerates dispersed separately in PP matrix for the enhancement in mechanical properties of the blends are very limited. Consequently, the enhanced interfacial interactions and the morphology with the rigid particles partially encapsulated by a rubber-like phase in matrix are crucial for the ternary polymer.blends. (C) 2016 Elsevier Ltd. All rights reserved.