基于空间限域强制组装法制备短切碳纤维/乙烯-醋酸乙烯导电复合材料性能

Properties of short carbon fiber/ethylene-vinyl acetate copolymer high conductivity composites prepared by spatial confining forced network assembly method

采用空间限域强制组装法(SCFNA)制备短切碳纤维/乙烯-醋酸乙烯共聚物(SCF/EVA)导电复合材料,研究SCFNA方法制备SCF/EVA复合材料中导电填料分布形态的演变规律及该方法对复合材料导电性能和力学性能的影响。与传统共混方法相比,采用SCFNA方法制备的SCF/EVA复合材料,导电网络上SCF的间距变小,网络密实度显著提高,导电性能得到大幅度提升并具有良好的力学性能。实验表明:通过SCFNA方法制备的SCF/EVA复合材料的逾渗阈值为6.5 wt%,低于共混自组装法的8.2 wt%。相同SCF质量分数下,SCF/EVA复合材料的电导率比共混法自组装最高提高4个数量级。随着SCF质量分数的增加,SCF/EVA复合材料的力学性能呈先提高后降低的趋势,其中10 wt%SCF/EVA复合材料的力学性能最优,拉伸强度达到19.86 MPa。

Short carbon fiber/ethylene-vinyl acetate copolymer(SCF/EVA)conductive composites were prepared by spatial confining forced network assembly(SCFNA).The evolution of the distribution of conductive fillers in SCF/EVA composites prepared by SCFNA method and the effect of the method on the electrical and mechanical properties of composites were investigated.Compared with the traditional blending method,the spacing of SCF on the conductive network of SCF/EVA composites prepared by SCFNA method is reduced,and the network compactness,electrical conductivity and mechanical properties are improved.The experimental results show that the percolation threshold of SCF/EVA composites prepared by SCFNA method is 6.5 wt%,which is lower than the blending self-assembly method which is 8.2wt%.At the same SCF mass fraction,SCF/EVA composites is up to 4 orders of magnitude higher than that of self-assembly by blending method.The mechanical properties of SCF/EVA composites increase first and then decrease with the increase of SCF mass fraction.The mechanical properties of 10 wt%SCF/EVA composites are the best,and the tensile strength reaches 19.86 MPa.