中国塑料 ›› 2009, Vol. 23 ›› Issue (09): 40-43 .DOI: 10.19491/j.issn.1001-9278.2009.09.009

• 材料与性能 • 上一篇    下一篇

聚合物熔体的介电性能研究

钟亮 杨艳娟   

  1. 华南理工大学机械与汽车学院
  • 收稿日期:2009-06-01 修回日期:1900-01-01 出版日期:2009-09-26 发布日期:2009-09-26

Dielectric Properties of Polymer Melts

ZHONG Liang;YANG Yan-juan   

  • Received:2009-06-01 Revised:1900-01-01 Online:2009-09-26 Published:2009-09-26
  • Contact: zhong liang

摘要: 研究了聚碳酸酯(PC)、低密度聚乙烯(LDPE)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 ℃温度范围内,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10 Hz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100~1 000 Hz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10 Hz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1 000 Hz时,PE-LD熔体的介电常数受温度的影响较小。

关键词: 聚合物, 熔体, 介电性能, 聚碳酸酯, 低密度聚乙烯

Abstract: 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 10Hz dielectric constant, but marginally affect the values between 100 Hz and 1 000 Hz. For PE-LD melt between 120 and 300 ℃, the 10Hz 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.

Key words: polymer, melt, dielectric property, polycarbonate, low-density polyethylene