摘要
以双溶液共混的方法制备了不同浓度的纳米SiOx／LDPE聚合物复合材料，并利用x射线衍射（XRD）对复合材料的结晶形态进行了测量。测量结果表明，纳米SiOx粒子的添加，使低密度聚乙烯（LDPE）的晶粒尺寸变小、结晶度变大。利用微电流计对不同浓度的纳米SiOx／LDPE聚合物复合材料在293-353K的温度范围内进行电导测量。结合计算机曲线拟舍技术，对空间电荷限制电流、肖特基效应、普尔．弗兰凯尔效应、离子跳跃电导模型进行了研究。研究表明，纯LDPE的电导模型以空间电荷限制电流为主，纳米SiOx／LDPE复合材料的电导以离子跳跃电导为主，并且其跳跃距离随温度的增加而增加。
Molecular structure and morphology of a composite of low-density-polyethylene （LDPE） and nano-SiOx prepared by the method of double-solution mixture were studied by X-ray Diffraction （ XRD）. It can been seen that the degree of crystallization increases, and the size of crystal become small, when the nano-SiO particles are added in LDPE. High-electric-field conduction in the composites was investigated in the range of 293 - 353 K. In order to find out the mechanism of high field conduction in nano-SiO /LDPE, Schottky effect, Poole-Frenkel effect, spacecharge-limited conduction （SCLC） , and ion hoppingconduction are studied. It is pointed out that space-charge-limited conduction fits well for pure LDPE. Both Schottky effect and Poole-Frenkel effect do not fit well for all of the sampies. Ion hopping conduction fits for the composite of LDPE/nano-SiO~, and the hopping distances of the composite increases with increasing temperature.
出处
《电线电缆》
2009年第6期21-24,共4页
Wire & Cable
