Effect of core‐shell morphology evolution on the rheology, crystallization, and mechanical properties of PA6/EPDM‐g‐MA/HDPE ternary blend
Effect of core‐shell morphology evolution on the rheology, crystallization, and mechanical properties of PA6/EPDM‐g‐MA/HDPE ternary blend
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DOI：
10.1002/app.38733
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发表时间：
2013-07
影响因子：
3
通讯作者：
Rui Dou;Wei Wang;Yan Zhou;Lan-peng Li;L. Gong;B. Yin;Ming‐bo Yang
中科院分区：
文献类型：
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作者：
Rui Dou;Wei Wang;Yan Zhou;Lan-peng Li;L. Gong;B. Yin;Ming‐bo Yang
将尼龙6(PA6)、三元乙丙橡胶接枝三元乙丙橡胶(EPDM-g-MA)、高密度聚乙烯(HDPE)同时加入密炼机中，熔融共混不同时间。研究了尼龙6/三元乙丙橡胶接枝甲基丙烯酸甲酯/高密度聚乙烯共混物的形态与流变行为、结晶性能和力学性能的关系。相形态观察表明，PA6/EPDM-g-MA/HDPE(70/15/15wt%)共混物是由分散的核壳液滴包裹在HDPE核中形成的，共混时间对核壳形态的演变起着决定性的作用。流变学测试表明，三元共混物的复数粘度和储能模数显着高于纯聚合物共混物和属于不同相形态的二元共混物。PA6/EPDM-g-MA/HDPE共混物的最大缺口冲击强度为80.7kJ/m2，是纯PA6的10~11倍。特别是差示扫描量热分析结果表明，由于高密度聚乙烯与三元乙丙橡胶接枝马来酸乙二醇酯共晶，使得高密度聚乙烯的本体结晶温度(114.6℃)有所降低，在102.2℃左右出现新的结晶峰。©2012威利期刊公司J.应用。波兰姆。《科学》，2013
In this article, polyamide 6 (PA6), maleic anhydride grafted ethylene-propylene-diene monomer (EPDM-g-MA), high-density polyethylene (HDPE) were simultaneously added into an internal mixer to melt-mixing for different periods. The relationship between morphology and rheological behaviors, crystallization, mechanical properties of PA6/EPDM-g-MA/HDPE blends were studied. The phase morphology observation revealed that PA6/EPDM-g-MA/HDPE (70/15/15 wt %) blend is constituted from PA6 matrix in which is dispersed core-shell droplets of HDPE core encapsulated by EPDM-g-MA phase and indicated that the mixing time played a crucial role on the evolution of the core-shell morphology. Rheological measurement manifested that the complex viscosity and storage modulus of ternary blends were notable higher than the pure polymer blends and binary blends which ascribed different phase morphology. Moreover, the maximum notched impact strength of PA6/EPDM-g-MA/HDPE blend was 80.7 KJ/m2 and this value was 10–11 times higher than that of pure PA6. Particularly, differential scanning calorimetry results indicated that the bulk crystallization temperature of HDPE (114.6°C) was partly weakened and a new crystallization peak appeared at a lower temperature of around 102.2°C as a result of co-crystal of HDPE and EPDM-g-MA. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013