协同改善BN/GO/PDMS复合材料的导热绝缘性能

Synergistically Enhancing the Thermal Conductivity and Insulation Properties of BN/GO/PDMS Composite

随着5G通讯技术、电子制造技术以及微电子组装技术的飞速发展,电子设备的功率和集成化程度越来越高,产品性能在提升的同时,散热需求显著提升。通过强制组装法制备了氮化硼/氧化石墨/聚二甲基硅氧烷(BN/GO/PDMS)导热绝缘复合材料,BN和GO对BN/GO/PDMS复合材料的热导率具有协同改善的作用。当BN含量为40%、GO含量为4%时,BN/GO/PDMS复合材料的热导率为4.161 W/(m·K),与BN/PDMS(1.843 W/(m·K))相比,增长了125.94%,为纯PDMS(0.27 W/(m·K))的14.41倍。同时,BN/GO/PDMS复合材料还具有优异的电绝缘性能(表面电阻率为1.12×10^(14)Ω·cm),及较好的力学性能,断裂伸长率及拉伸强度分别为92.8%、0.133 MPa。因此,BN/GO/PDMS复合材料在热界面材料应用中具有较大的发展前景。

With the rapid development of 5G communication technology,electronic manufacturing technology and microelectronic assembly technology,the power and integration of electronic devices were got higher,and the improvement of product performance also brought severe challenges to heat dissipation requirements.Boron nitride/graphite oxide/polydimethylsiloxane(BN/GO/PDMS)thermal insulation composite were prepared by forced assembly method.BN and GO had synergistic effect on the thermal conductivities of BN/GO/PDMS composite.When the content of BN was 40%and GO was 4%,the thermal conductivity of BN/GO/PDMS composite could reach 4.161 W/(m·K),which was 125.94%higher than BN/PDMS(1.843 W/(m·K))and 14.41 times higher than that of pure PDMS(0.27 W/(m·K)).At the same time,BN/GO/PDMS composite also had excellent electrical insulation properties(surface resistivity of 1.12×10^(14)Ω·cm)and excellent mechanical properties(elongation at break of 92.8%and tensile strength of 0.133 MPa).Therefore,BN/GO/PDMS composite had great potential in thermal interface materials.