摘要
选用电导率、导热系数高的石墨(普通鳞片石墨FG、可膨胀石墨KP35、膨胀石墨EG35)对低密度聚乙烯(LDPE)进行填充改性,采用钛酸酯偶联剂NDZ101对石墨进行表面处理,提高石墨与聚合物基体的界面相互作用,制备出力学性能、导电、导热等综合性能优良的LDPE/石墨复合材料。结果表明:石墨的填充大大改善了聚乙烯的导电、导热和耐热性能,当石墨含量达20%时(文中的各种元素含量均指质量分数),LDPE/KP35的电导率达到1.91×10-7S/m,拉伸强度较LDPE有小幅提高,可作为导热抗静电材料推广应用。
The thermal conductive LDPE/graphite composites were prepared by melting low density polyethylene kneaded with flake graphite (FG) or expandable graphite (KP35) or expanded graphite (EG35) treated with couple agent NDZ101 on a roll mill. The thermal and electrical conductivity of LDPE were greatly improved because of filling with graphite, the thermal conductivity of LDPE/FG composites with 50 % FG is 1.04 W·m-1·K-1,as high as 3 times of that of LDPE, the electrical conductivity of composites with 30 % reaches 2.91×10-7 S/m, as high as 106 times of LDPE, and the mechanical performances and thermal stability are good too.
基金
国家重点研究发展规划基金项目(G1999064809)
关键词
低密度聚乙烯(LDPE)
石墨
复合材料
low density polyethylene (LDPE)
graphite
conductive composites
thermal conductivity
