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首页> 外文期刊>Journal of Applied Polymer Science >Economical conductive graphite-filled polymer composites via adjustable segregated structures: Construction, low percolation threshold, and positive temperature coefficient effect
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Economical conductive graphite-filled polymer composites via adjustable segregated structures: Construction, low percolation threshold, and positive temperature coefficient effect

机译：通过可调节隔离结构的经济性导电石墨的聚合物复合材料：结构，低渗透阈值和正温度系数效应

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摘要

The economical graphite-filled thermoplastic urethane/ultra-high molecular weight polyethylene (TPU/UHMWPE) composites with the segregated structure were constructed by the combination of mechanical crushing and melt blending method. The low percolation threshold of 1.89 wt% graphite in the adjustable segregated composites was obtained and high electrical conductivity was about 10(-1) S m(-1) at 10 wt% graphite loadings owing to the formation of three-dimensional conductive networks. Moreover, when the graphite loadings were over the percolation threshold, the remarkable positive temperature coefficient (PTC) effect of electrical resistivity for TPU/UHMWPE-Graphite composites were achieved, originating from the combined thermal motion of TPU and UHMWPE. Meanwhile, the outstanding repeatability of PTC effects was obtained after 5-time cycles. Therefore, economical conductive polymer composites were still the promising field in the practical application of PTC materials.
机译：采用机械破碎和熔融共混相结合的方法制备了具有分离结构的石墨填充热塑性聚氨酯/超高分子量聚乙烯（TPU/UHMWPE）复合材料。在可调偏析复合材料中，石墨含量为1.89%（质量分数）的低渗透阈值得到了提高，在石墨含量为10%（质量分数）的情况下，由于形成了三维导电网络，导电率约为10（-1）S m（-1）。此外，当石墨负载量超过逾渗阈值时，TPU/UHMWPE石墨复合材料的电阻率产生了显著的正温度系数（PTC）效应，这源于TPU和UHMWPE的联合热运动。同时，经过5次循环后，PTC效应获得了优异的重复性。因此，在PTC材料的实际应用中，经济型导电聚合物复合材料仍然是一个很有前途的领域。

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