摘要
利用多巴胺(DA)的氧化自聚合特性,对六方氮化硼(h-BN)进行表面修饰,并以多巴胺改性后的氮化硼(h-BN@PDA)为导热填料,对基体芳纶沉析纤维(AF)进行填充,通过真空辅助抽滤法制备多巴胺改性氮化硼/芳纶沉析(h-BN@PDA/AF)复合薄膜,并对其微观形貌、表面官能团、导热性能、绝缘性能及力学性能进行研究.结果表明,聚多巴胺(PDA)包覆在h-BN表面,并引入活性基团,与AF纤维产生氢键,改善了两者的界面结合,显著提高了复合薄膜导热性能及绝缘性能.当h-BN@PDA含量为70%时,h-BN@PDA/AF复合薄膜的导热系数为1.36 W/(m·K),与纯芳纶沉析薄膜相比,导热系数的增幅约为697.65%,体积电阻率为5.96×10^14Ω·m,拉伸模量高达287.19 MPa.
To expand the application of aramid fibrid(AF)in the field of insulated and thermal conductive electronic devices,dopamine(DA)was used to modify the hexagonal boron nitride(h-BN)initially,which could oxidize self-polymerization under weak alkaline conditions and form the strong adhesive polydopamine(PDA).Then,the modified h-BN(h-BN@PDA)was used as the heat conductive filler to fill the AF matrix.Subsequently,h-BN@PDA/AF composite films were prepared by vacuum assisted filtration,and the microstructure,surface functional group,thermal conductivity,insulation properties and mechanical properties were also analyzed.The results showed that PDA was coated on the surface of h-BN,and plenty of active groups were introduced on the surface to form hydrogen bond with AF fiber.It was beneficial to increase the interfacial bonding and improve conductivity and insulation properties of composite films.When the h-BN@PDA mass fraction was 70%,thermal conductivity of h-BN@PDA/AF composite films could reach 1.36 W/(m·K),which increased by 697.65%compared to pure AF films.Additionally,the volume resistivity and tensile modulus of h-BN@PDA/AF composite films were 5.96×10^14Ω·m and 287.19 MPa,respectively.
作者
谢璠
王亚芳
卓龙海
秦盼亮
宁逗逗
王丹妮
陆赵情
XIE Fan;WANG Yafang;ZHUO Longhai;QIN Panliang;NING Doudou;WANG Danni;LU Zhaoqing(College of Bioresources Chemical and Materials Engineering,Shaanxi Province Key Laboratory of Paper-making Technology and Specialty Paper,National Demonstration Center for Experimental Light Chemistry Engineering Education,Key Laboratory of Paper Based Functional Materials of China National Light Industry,Shaanxi Collaborative Innovation Center of Industrial Auxiliary Chemistry and Technology,Shaanxi University of Science&Technology,Xi’an 710021,China)
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2020年第3期582-590,共9页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:51803110)
国家重点研发计划项目(批准号:2017YFB0308300,2017YFB0308302)
陕西省自然科学基础研究计划(批准号:2019JQ-010)
陕西省重点科技创新团队计划(批准号:2017KCT-02)资助~~
关键词
氮化硼
多巴胺
芳纶沉析
绝缘性能
导热性能
Hexagonalboron nitride
Dopamine
Aramid fibrid
Insulation property
Thermal conductivity
作者简介
联系人简介:陆赵情,男,博士,教授,主要从事高性能纸基功能材料研究.E-mail:luzhaoqing302@163.com。
