Morphology and electrical conductivity of injection-molded polypropylene/carbon black composites with addition of high-density polyethylene
Morphology and electrical conductivity of injection-molded polypropylene/carbon black composites with addition of high-density polyethylene
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DOI：
10.1016/j.polymer.2006.03.064
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发表时间：
2006-05
期刊：
影响因子：
4.6
通讯作者：
H. Yui;Guozhang Wu;H. Sano;M. Sumita;K. Kino
中科院分区：
文献类型：
--
作者：
H. Yui;Guozhang Wu;H. Sano;M. Sumita;K. Kino
研究了炭黑（CB）对高密度聚乙烯（HDPE）/聚丙烯（PP）共混物微观结构的影响以及剪切变形对导电网络结构的影响。我们观察到HDPE分子与碳表面的强烈相互作用和CB颗粒选择性地位于HDPE域。注塑试样的形态由三部分组成，即CB-HDPE复合相畴、自由HDPE相畴和PP相畴。HDPE和CB浓度、CB结构和PP粘度显著影响自由HDPE域的体积和微观结构。我们还证实了CB颗粒能够在很短的时间内在高剪切速率下自组装形成无规导电网络。形态学变化最终与电导率的变化相关联。
This work attempts to clarify the influence of carbon black (CB) addition on the microstructure of injection-molded high-density polyethylene (HDPE)/polypropylene (PP) blends and effect of shear-induced polymer deformation on the conductive network structure. We observed that HDPE molecules are strongly interacted with carbon surfaces and CB particles are selectively located in HDPE domains. Morphology of the injection-molded specimen consists of three parts, namely, CB–HDPE complex domain, free HDPE domain and PP domain. The volume and microstructure of the free HDPE domain are significantly influenced by HDPE and CB concentration, CB structure, and PP viscosity. We also confirmed that the CB particles are capable of self-assembly to form random conductive networks even under high shear rate within very short time. The morphological changes were finally correlated to the variation of electrical conductivity.