Simultaneous enhancement of electrical conductivity and impact strength via formation of carbon black-filler network in PP/EPDM blends
Simultaneous enhancement of electrical conductivity and impact strength via formation of carbon black-filler network in PP/EPDM blends
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通过在 PP/EPDM 共混物中形成炭黑填料网络，同时增强导电性和冲击强度
DOI：
10.1002/pat.1588
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发表时间：
2011-06-01
影响因子：
3.4
通讯作者：
Fu, Qiang
中科院分区：
文献类型：
--
作者：
Yang, Hong;Li, Bo;Fu, Qiang
研究了聚丙烯/三元乙丙橡胶/炭黑三元复合材料的导电性和冲击强度。采用两种不同的加工方法制备了这些三元复合材料。一种是将弹性体和填料直接熔融共混到PP基体中的一步法。另一种是两步法，即先将弹性体和填料混合，然后与纯PP熔融共混。为了获得有利于导电和冲击强度的最佳相形态，控制炭黑在PP/EPDM共混物中的分布是一个关键因素。因此，首先通过测量接触角计算了界面张力和粘附功，结果表明，炭黑倾向于聚集在三元乙丙橡胶相周围，形成填充网络结构。意想不到的是，两步法制备的PP/EPDM/CB(80/20/3)复合材料中观察到了填充网络结构。这种填充网络结构的形成降低了炭黑在聚合物中的渗流阈值，大大提高了复合材料的电导率和冲击强度。这项工作为制备导电性和冲击强度都得到提高的聚合物复合材料提供了一条新的途径。版权所有(C)2009 John Wiley&Sons，Ltd.
The electrical conductivity and impact strength of polypropylene(PP)/EPDM/carbon black ternary composites were investigated in this paper. Two processing methods were employed to prepare these ternary composites. One was called one-step processing method, in which the elastomer and the filler directly melt blended with PP matrix. Another one was called two-step processing method, in which the elastomer and the filler were mixed first, and then melt blended with pure PP. To get an optimal phase morphology that favors the electrical conductivity and impact strength, controlling the distribution of CB in PP/EPDM blend was a crucial factor. Thus the interfacial tension and the work of adhesion were first calculated based on the measurement of contact angle, and the results showed that CB tended to be accumulated around EPDM phases to form filler-network structure. Expectably, the filler-network structure was observed in PP/EPDM/CB(80/20/3) composite prepared by two-step processing method. The formation of this filler-network structure decreased the percolation threshold of CB particles in polymer matrix, and the electrical conductivity as well as Izod impact strength of the composite increased dramatically. This work provided a new way to prepare polymer composites with both improved conductivity and impact strength. Copyright (C) 2009 John Wiley & Sons, Ltd.