TPU/EVA/CNT双逾渗导电复合材料的制备和性能

Preparation and Properties of Thermoplastic Elastomer/Ethylene-Vinyl Acetate Copolymer/Carbon Nanotube Double-Percolation Conductive Composite

利用熔融共混法制备了以热塑性聚氨酯(TPU)、乙烯-醋酸乙烯共聚物(EVA)为基体,碳纳米管(CNT)为填料的导电复合材料,并研究了加料方式、组分比和CNT含量对复合材料电性能与力学性能的影响。研究表明,CNT会优先选择分散在TPU相中,并且随着EVA含量增加,电性能呈现先增加后降低的趋势。当TPU和EVA质量比为45/55,采用TPU先与CNT共混,再与EVA熔融共混时,体系电性能最佳。此时TPU/CNT-EVA复合材料的逾渗阈值仅为1.42%(质量分数),比TPU/CNT和EVA/CNT分别降低了25%和52%。而力学性能研究表明,随着CNT含量的增加,复合材料的力学性能变差。

Thermoplastic polyurethane(TPU)/ethylene-vinyl acetate copolymer(EVA)/carbon nanotube(CNT)conductive composites were fabricated through melt blending.The influence of addition method,composition ratio and CNT content on the electrical and mechanical properties of the composites was investigated.The results show that CNT is selectivity distributed in the TPU phase,and the electrical conductivity of the composites first increase and then decrease with increasing EVA contents.When TPU is first blended with CNT and then blended with EVA,double-percolation conducting networks could be generated at the TPU/EVA mass ratio of 45/55.At the same time,the percolation threshold of TPU/CNT-EVA composite is only 1.42%by mass,which is 25%and 52%lower than TPU/CNT and EVA/CNT.With the increase of CNT contents,the mechanical properties gradually become worsen.