隔离-双逾渗结构GNS／HDPE／UHMWPE导电复合材料研究

Study on GNS/HDPE/UHMWPE Conductive Composites with the Segregated and Double-percolated Structure

通过溶液和机械搅拌混合的方法,成功制备出具有隔离-双逾渗结构的GNS/HDPE/UHMWPE复合材料,使用低含量的高密度聚乙烯(HDPE)作为石墨烯(GNS)载体,分布于超高摩尔质量聚乙烯(UHMWPE)粒子界面。形貌观察显示:在复合材料中形成一种特殊的二维隔离-双逾渗结构导电网络,在极低GNS含量下(体积分数0.05%)达到导电逾渗值。GNS/HDPE/UHMWPE复合材料的拉伸强度随着GNS含量的增加,呈现先增后减的趋势,而其拉伸模量则随GNS增加而提高。

A conductive graphene （UHMWPE） composite with segregated nanosheet （ GNS ）/HDPE/ultrahigh molecular weight polyethylene and a double-percolated structure were prepared by a solution and mechanically stirred mixing method. A very small amount of high density polyethylene （HDPE） was used as the percolated phase to load the GNS which dispersed on the surface of UHMWPE. OM and SEM observations revealed the formation of a two-dimensional segregated and double-percolated structure conductive network, resulting in an ultralow percolation of 0. 05 vol. %. The tensile strength of GNS/HDPE/UHMWPE composites increased and then decreased with the increasing content of GNS, while the tensile modulus increased with the GNS content.