Abstract
To simultaneously endow thermal conductivity,high glass transition temperature(Tg)and healing capability to glass fiber/epoxy(GFREP)composite,dynamic crosslinked epoxy resin bearing reversible β-hydroxyl ester bonds was reinforced with boron nitride nanosheets modified glass fiber cloth(GFC@BNNSs).The in-plane heat conduction paths were constructed by electrostatic self-assembly of polyacrylic acid treated GFC and polyethyleneimine decorated BNNSs.Then,the GFC@BNNSs were impregnated with the mixture of lower concentration(3-glycidyloxypropyl)trimethoxysilane grafted BN micron sheets,3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate and hexahydro-4-methylphthalic anhydride,which accounted for establishing the through-plane heat transport pathways and avoiding serious deterioration of mechanical performances.The resultant GFREP composite containing less boron nitride particles(17.6 wt％)exhibited superior in-plane(3.29 W·m-1·K-1)and through-plane(1.16 W·m-1·K-1)thermal conductivities,as well as high Tg of 204 ℃(Tg of the unfilled epoxy=177 ℃).The re-versible transesterification reaction enabled closure of interlaminar cracks within the composite,achieving decent healing efficiencies estimated by means of tensile strength(71.2％),electrical breakdown strength(83.6％)and thermal conductivity(69.1％).The present work overcame the disadvantages of conventional thermally conductive composites,and provided an efficient approach to prolong the life span of thermally con-ductive GFREP laminate for high-temperature resistant integrated circuit application.
基金项目
国家自然科学基金(52033011)
国家自然科学基金(51973237)
国家自然科学基金(52373095)
Natural Science Foundation of Guangdong Province,China(2019B1515120038)
Natural Science Foundation of Guangdong Province,China(2021A1515010417)
广东省自然科学基金(2020B010179001)
广州市科技计划(202201011568)
GBRCE for Functional Molecular Engineering()
Fundamental Research Funds for the Central Universities,Sun Yatsen University(23yxqntd002)
万方数据