To enhance the toughness and electrical insulation properties of cured epoxy,carboxyl-terminated polybutadiene(CTPB)liquid rubber was used to modify epoxy in this study,and the thermal conductivity,mechanical and diel...To enhance the toughness and electrical insulation properties of cured epoxy,carboxyl-terminated polybutadiene(CTPB)liquid rubber was used to modify epoxy in this study,and the thermal conductivity,mechanical and dielectric properties of modified epoxy were investigated.The results indicate that the CTPB-epoxy exhibits higher impact strength and lower dielectric constant and loss compared with pure epoxy.Further,hexagonal boron nitride(hBN)was used to reinforce epoxy modified with 20 phr CTPB.It is found that compared with the hBN/epoxy under the same filler loading,the heat conductive hBN/CTPB/epoxy possesses a lower dielectric permittivity and dissipation factor in all frequency ranging from 10^(2)–10^(7)Hz,a higher electrical resistivity and dielectric breakdown strength,and improved mechanical toughness.Therefore,the prepared hBN/CTPB/epoxy composites are potentially useful in practical electrical insulation applications.展开更多
基金supports from the National Science Foundation of China(grant no.51577154)the Key Laboratory of Engineering Dielectrics and Its Application,Ministry of Education,Harbin University of Science and Technology(grant no.KF20151111)Shaanxi Provincial Natural Science Foundation,China(grant no.2016JM5014)。
文摘To enhance the toughness and electrical insulation properties of cured epoxy,carboxyl-terminated polybutadiene(CTPB)liquid rubber was used to modify epoxy in this study,and the thermal conductivity,mechanical and dielectric properties of modified epoxy were investigated.The results indicate that the CTPB-epoxy exhibits higher impact strength and lower dielectric constant and loss compared with pure epoxy.Further,hexagonal boron nitride(hBN)was used to reinforce epoxy modified with 20 phr CTPB.It is found that compared with the hBN/epoxy under the same filler loading,the heat conductive hBN/CTPB/epoxy possesses a lower dielectric permittivity and dissipation factor in all frequency ranging from 10^(2)–10^(7)Hz,a higher electrical resistivity and dielectric breakdown strength,and improved mechanical toughness.Therefore,the prepared hBN/CTPB/epoxy composites are potentially useful in practical electrical insulation applications.
