ABSTRACT

High-density polyethylene (HDPE) conductive polymer composites are prepared using carbon fillers, such as natural flake graphite (FG), carbon black (CB), and carbon fibre (CF). Here, micro-sized FG as the main conductive filler, nano-sized CB as assistant conductive filler, and short CF as flexibility-enhanced materials are internally mixed with HDPE in a certain weight ratio. Commercial conductive polymer composite is prepared by hot pressing technology. Two kinds of conductive composites are selected by optimising the ratio of carbon fillers and HDPE. CF_4%(CB + FG)_1:5HDPE_27% composite has the higher volume conductivity of 20.76 S cm⁻¹ with a bending strength of 39.5 MPa. CF_4%(CB + FG)_1:4HDPE_30% composite has the larger bending strength of 53.6 MPa with a volume conductivity of 18.82 S cm⁻¹. The electrochemical corrosion resistances of those two composite electrodes are investigated over 900 charging/discharging cycles in the lead methanesulfonate flow cell. CF_4%(CB + FG)_1:4HDPE_30% composite exhibits better durability than CF_4%(CB + FG)_1:5HDPE_27% composite.

摘要

高密度聚乙烯 (HDPE) 导电聚合物复合材料是使用天然鳞片石墨 (FG)、炭黑 (CB) 和碳纤维 (CF) 等碳填料制备的。此处以微米级FG为主要导电填料，纳米级CB为辅助导电填料，短CF为柔韧性增强材料，与HDPE按一定重量比内混。商业导电聚合物复合材料是通过热压技术制备的。通过优化碳填料与HDPE的配比，选择了两种导电复合材料。CF _4% (CB + FG) _1:5 HDPE _27%复合材料具有更高的体积电导率 20.76 S cm ^-1和弯曲强度 39.5 MPa。CF _4% (CB + FG) _1:4HDPE _30%复合材料具有 53.6 MPa 的较大弯曲强度和 18.82 S cm ^-1的体积电导率。在甲磺酸铅流通池中研究了这两个复合电极的电化学耐腐蚀性超过 900 次充电/放电循环。CF _4% (CB + FG) _1:4 HDPE _30%复合材料的耐久性优于 CF _4% (CB + FG) _1:5 HDPE _27%复合材料。