化工新型材料

化工新型材料 ›› 2022, Vol. 50 ›› Issue (10) : 106-111. DOI: 10.19817/j.cnki.issn1006-3536.2022.10.021

新材料与新技术

聚间苯二甲酰间苯二胺基复合电介质的制备及其导热性能

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作者信息 +

Preparation and thermal conductivity of PMIA dielectric composite

Xin Changzheng^1,2, Hu Fengying¹, Chi Changlong^1,2, Duan Guangyu^1,2

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文章历史 +

Received		Published
2021-06-07		2022-10-20
Issue Date	Revised Date
2022-11-01	2021-06-07

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摘要

分别选用过氧化氢和聚多巴胺(PDA)改性钛酸钡纳米粒子和多壁碳管(MWCNTs),以六亚甲基二异氰酸酯为“桥联剂”将改性钛酸钡和MWCNTs构筑成钛酸钡-多壁碳管(BTCN)复合粒子。研究了BTCN复合粒子对聚间苯二甲酰间苯二胺(PMIA)基复合电介质热学性能、介电性能和导热性能的影响。结果表明,BTCN复合粒子并没有影响PMIA基复合电介质的热学性能,所制备的复合材料的玻璃化转变温度均超过275℃。同时,随着BTCN复合粒子含量的增加,PMIA基复合电介质的介电常数提升明显,当BTCN含量为10%(质量分数)时,PMIA电介质在10³Hz时的介电常数相较于纯PMIA提升了117%。此外,BTCN复合粒子的加入可有效改善PMIA基复合电介质的导热性,如含有10% BTCN复合粒子的PMIA基复合电介质的导热系数提升至0.62W/(m·K),相较于纯PMIA[0.23W/(m·K)]提升了169%,导热性能的改善可有效降低电介质内部热效应,避免热击穿的发生。

Abstract

Hydrogen peroxide (H₂O₂) and polydopamine (PDA) were utilized to modify barium titanate (BaTiO₃) nanoparticles and multi-walled carbon tubes (MWCNTs),respectively.Then hexamethylene diisocyanate was employed as “bridging agent” to form BTCN fillers by reacting with modified BaTiO₃ and MWCNTs.The effects of BTCN fillers on thermal property,dielectric property and thermal conductivity of poly(m-phenyleneisophthalamide)(PMIA) dielectrics were researched.The consequences indicated that BTCN fillers displayed little effect on thermal property,and the glass transition temperature of corresponding PMIA dielectrics were more than 275℃.In addition,with increasing content of BTCN,the dielectric constant of PMIA dielectric obviously increased.When the content of BTCN was 10wt%,the dielectric constant of PMIA dielectric manifested enhancement by 117% at 10³Hz compared with pure PMIA.Additionally,BTCN fillers can also effectively improve the thermal conductivity of manufactured PMIA dielectrics.For example,the thermal conductivity of PMIA dielectric with 10wt% BTCN increased to 0.62W/(m·K) compared with pure PMIA.[0.23W/(m·K)],and showing an improvement of 169%.The improved thermal conductivity was beneficial in reducing internal thermal effect and suppressed occurrence of thermal breakdown.

关键词

聚间苯二甲酰间苯二胺 / 钛酸钡 / 多壁碳管 / 介电性能 / 导热系数

Key words

poly(m-phenyleneisophthalamide) / barium titanate / multi-walled carbon tube / dielectric property / thermal conductivity

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聚间苯二甲酰间苯二胺基复合电介质的制备及其导热性能[J]. 化工新型材料, 2022, 50(10): 106-111 DOI:10.19817/j.cnki.issn1006-3536.2022.10.021

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