微波辅助低温固化聚酰亚胺薄膜的制备及其力学和电学性能

IF 1.8 4区 化学 Q3 POLYMER SCIENCE High Performance Polymers Pub Date : 2022-11-01 DOI:10.1177/09540083221100366
K. Tao, Fei Qin, Yahui Li, Shuai Zhang, Shihui Han, Guangming Liu, Jun Wang, Junchang Shen, Zailin Yang, Yi Tang, Gaohui Sun
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引用次数: 1

摘要

采用微波辅助低温法制备了具有优良机械性能和电性能的聚酰亚胺薄膜。利用微波激发偶极子分子的往复运动,即使在低温下,也能促进官能团的旋转和构象变化。因此,羧基上的n -氢键与-OH之间的反应可以正常进行,从而实现聚酰胺的脱水和环化。结果表明,环境温度仅为70℃,微波功率为2000 W或更高,也可以制备出亚胺化度为100%的PI薄膜。对于PI- 2000w,与仅在300℃温度下生成的传统PI膜(PI-300℃)相比,在不改变分子结构、不添加填料的基础上,其抗拉强度、弹性模量、结晶度和表观密度分别提高了约21%、51%、37%和5%。电性能方面,与PI-300°C相比,电导率提高了一到两个数量级。结果表明,在保持PI膜原有分子结构不变的前提下,本研究为提高PI膜的力学性能和电性能提供了一种新的有效方法。
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Fabrication, mechanical and electrical properties of polyimide films cured at low-temperature assisted by microwave radiation
Polyimide (PI) films with excellent mechanical and electrical properties were produced at a low temperature assisted by microwave. Depending on the reciprocating movement of dipole molecules excited by microwave, even though under a low temperature, the rotation and conformational changes of functional groups could also be promoted. Thus, reaction between N-H bond and -OH in carboxyl which could realize dehydration and cyclization of polyamic acid proceeded normally. Results revealed that the combination between ambient temperature only at 70°C and microwave power at 2000 W or higher could also produce PI films with imidization degree of 100%. For PI-2000W, compared with traditional PI film (PI-300°C) that generated only at temperature of 300°C, even though on the basis of no any change in molecular structure and addition of filler, the tensile strength, elastic modulus, crystallinity, and apparent density increased by about 21%, 51%, 37%, and 5%, respectively. For electrical properties, conductivity enhanced by one to two orders of magnitude comparing with PI-300°C. Results indicated that while keeping the original molecular structure of PI films unchanged, this work provided a new and effective method to assist the enhancement in mechanical and electrical properties of PI films.
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来源期刊
High Performance Polymers
High Performance Polymers 化学-高分子科学
CiteScore
4.20
自引率
14.30%
发文量
106
审稿时长
1.2 months
期刊介绍: Health Services Management Research (HSMR) is an authoritative international peer-reviewed journal which publishes theoretically and empirically rigorous research on questions of enduring interest to health-care organizations and systems throughout the world. Examining the real issues confronting health services management, it provides an independent view and cutting edge evidence-based research to guide policy-making and management decision-making. HSMR aims to be a forum serving an international community of academics and researchers on the one hand and healthcare managers, executives, policymakers and clinicians and all health professionals on the other. HSMR wants to make a substantial contribution to both research and managerial practice, with particular emphasis placed on publishing studies which offer actionable findings and on promoting knowledge mobilisation toward theoretical advances. All papers are expected to be of interest and relevance to an international audience. HSMR aims at enhance communication between academics and practitioners concerned with developing, implementing, and analysing health management issues, reforms and innovations primarily in European health systems and in all countries with developed health systems. Papers can report research undertaken in a single country, but they need to locate and explain their findings in an international context, and in international literature.
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