摘要
为了研究等离子体改性初期聚酰亚胺的热力学性能变化,基于分子模拟的方法建立了纯聚酰亚胺模型和含不同百分比接枝极性基团分子链的聚酰亚胺模型,计算了力学和热学性能的重要指标变化。结果表明,改性后的聚酰亚胺分子弹性模量和玻璃化温度随着极性基团占比增加而增大,其力学和热学性能在等离子体改性初期随着改性时间的增加得到改善,当接枝极性基团分子链占比为25%时,相较于纯聚酰亚胺,弹性模量提升了19%,力学性能得到显著改善,玻璃化温度提升了1.53%,热学性能有所提升,但提升效果并不显著。
In order to study the thermodynamic properties of polyimide at the initial stage of plasma modification,in this paper,based on the molecular simulation method,the pure polyimide model and the polyimide model with different percentage of grafted polar groups are established,and the changes of important mechanical and thermal properties are calculated.The results show that the molecular elastic modulus and glass transition temperature of the modified polyimide increase with the increase of the proportion of polar groups,and the mechanical and thermal properties of the modified polyimide are improved with the increase of modification time at the initial stage of plasma modification.When the proportion of grafted polar group molecular chain is 25%,compared with pure polyimide,the elastic modulus is increased by 19%.The mechanical properties are significantly improved,the glass transition temperature is increased by 1.53%,and the thermal properties are improved,but the improvement effect is not significant.
作者
吴泽棐
杨雁
张鹏鹏
陈晓玄
WU Zefei;YANG Yan;ZHANG Pengpeng;CHENG Xiaoxuan(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《电工技术》
2022年第3期117-121,共5页
Electric Engineering
关键词
聚酰亚胺
等离子体改性
分子动力学模拟
弹性模量
玻璃化温度
polyimide
plasma modification
molecular dynamics simulation
elastic modulus
glass transition temperature
