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.
出处
《中国塑料》
CAS
CSCD
北大核心
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)
关键词
聚合物
聚碳酸酯
低密度聚乙烯
熔体
介电性能
polymer
polycarbonate
low-density polyethylene
melt
dielectric property
