PMMA的摩尔质量对其介电性能的影响  

Effect of Molecular Weight on Dielectric Performance of PMMA

作　　者：胡波[1] 钟力生[1] 马素德[1] 王朋国[1] 徐传骧[1] 

机构地区：[1]西安交通大学电力设备电气绝缘国家重点实验室,陕西西安710049

出　　处：《塑料工业》2006年第1期35-37,共3页China Plastics Industry

摘　　要：向塑料光纤纤芯材料纯PMMA中引入链转移剂正丁硫醇(nBM)以控制摩尔质量。研究了正丁硫醇用量对PMMA介电性能(相对介电常数εr、介质损耗因素、松弛频率fτ与体积电阻率ρv)的影响。结果表明,PMMA的介电性能几乎不受影响,同时还发现,PMMA的摩尔质量和摩尔质量分布的变化对其密度影响不大,说明塑料光纤在控制摩尔质量时可以兼顾力学性能与介电性能。Chain transfer agents （n-BM） was applied to pure PMMA, which was used as the core materials in polymer optical fiber （POF）, to control the molecular weight of PMMA. The effect of the mass concentration of the chain transfer agents on the dielectric performance such as relative permittivity εr, tanδmax of β-peak loss value, relaxation frequency fτ and conductor volume resistivity were studied. The results showed the dielectric performance of PMMA was hardly affected, and the changes of the molecular weight and the distribution of the molecular weight had little effect on the density of PMMA, which showed both the mechanical properties and dielectric performance of POF could be taken into account in the control of the molecular weight of PMMA.

关 键 词：聚甲基丙烯酸甲酯(PMMA) 介电性能 链转移剂 光纤 

分 类 号：TQ320.7[化学工程—合成树脂塑料工业]