Study On The Enhanced Heat Conduction Of Polyurethane Membrane By Constructing BNNSs/CNTs Thermal Network

With the rapid development of information society,all kinds of semiconductor devices are developing rapidly in the direction of power miniaturization and integration.However,people has drawn attention to how to solve the problem of heat dissipation of electronic components.Thermal interface materials(TIMs)play an important role in thermal management,which display the advantages of flexibility,high thermal conductivity and electrical insulation.In this paper,we used ultra-thin hexagonal boron nitride nanosheets(h-BNNSs)and carbon nanotubes(CNTs)to build thermal conductivity network in order to improve the thermal conductivity of composite membrane.Thermoplastic polyurethane elastomer(TPU)was added to enhance excellent mechanical properties of h-BNNSs/CNTs/TPU ternary composite membrane.Hence,the main research contents are as follows:1.Here we list the main characteristics of thermal interface materials.Then we come to conclude that ternary composite membrane as an ideal thermal interface material has some advantages.At the same time,the related researches on functional application of thermal conductive fillers as well as elastomer polymers are also listed in the first chapter.2.We described a construction method of thermally conductive composite filler h-BNNSs/CNTs.The exfoliation optimization experimentof boron nitride nano sheet and acidification optimization experiment of carbon nanotube were carried out.And the composite filler was used to improve the thermal conductivity of thermally conductive composite filler.3.We described the synthesis methods and main properties of h-BNNSs/CNTs/TPU ternary composite membrane,and reported a kind of ternary composite membrane material based on thermoplastic polyurethane,two-dimensional boron nitride nano sheet and one-dimensional carbon nanotube as composite thermal conductive filler network.The composite membrane showed excellent performance expression.The maximum thermal conductivity of(h-BNNS30/CNTs70)65/TPU35 ternary composite mebmbrane was 1.35 W·m-1·K-1,which was 513%higher than that of pure thermoplastic polyurethane elastomer.In terms of thermal stability,the quality of the h-BNNSs/CNTs/TPU composite membrane was stable before 345?.When talking about mechanical properties,the h-BNNSs/CNTs/TPU composite membrane had excellent tensile properties,which can be extended to 300%of the original length,and excellent elastic as well as flexible properties.In addition,the ternary composite membrane also had excellent electrical insulation and arbitrary machinability.So as an ideal thermal interface material,h-BNNSs/CNTs/TPU ternary composite membrane may have wide application prospect.