聚合物熔体的介电性能研究  

Dielectric Properties of Polymer Melts

作　　者：钟亮[1] 杨艳娟[1] 

机构地区：[1]华南理工大学机械与汽车学院机械电子研究所,广东广州510640

出　　处：《中国塑料》2009年第9期40-43,共4页China Plastics

基　　金：国家自然科学基金项目(60801034)

摘　　要：研究了聚碳酸酯（PC）、低密度聚乙烯（PE-LD）两种聚合物熔体的介电性能。结果表明，PC熔体在220-320℃范围内，PE-LD熔体在120-300℃范围内，两种聚合物熔体的介电常数在低频时随频率的增加而显著减小；频率为10Hz时，PC熔体的介电常数在220～320℃范围内随温度的升高而增大，介电常数变化较大，而频率为100-1000Hz时，PC熔体的介电常数在此温度范围内随温度的升高变化较小；频率为10Hz时，PE-LD熔体的介电常数在120-300℃范围内随温度的升高表现出先增大后减小，再增大的复杂关系，频率为1000Hz时，PE-LD熔体的介电常数受温度的影响较小。In this paper, the dielectric property of PC and PE-LD melts were studied. For PC melt between 220 and 320℃, increasing temperature increased considerably the 10 Hz dielectric constant, but marginally affected the values between 100 Hz and 1 000 Hz. For PE-LD melt between 120 and 300℃, the 10 Hz dielectric constant first increased, then decreased and finally increased again. When the frequency was 1 000 Hz, the temperature had little influence on its dielectric constant. At low frequency zone, the dielectric constants of both melts decreased with increasing frequency.

关 键 词：聚合物 聚碳酸酯 低密度聚乙烯 熔体 介电性能 

分 类 号：O631.3[理学—高分子化学]