乙烯导热复合材料制备与性能 材料学VIP免费

聚乙烯导热复合材料的制备与性能摘要：科研工作者们主要通过两种方法来提高高分子材料的导热性能。一是制备本征型导热高分子材料使材料本身具备高导热性能；二是加入填料制备填充型导热复合材料。本征型导热高分子材料对工艺要求高，难以工业化生产。相比之下，向基体中添加导热填料则是简单而有效的方法。石墨烯由于其独特的二维结构和性质，如零隙带结构、高电子迁移率和高热导率，作为导热填料进行聚合物改性前景广阔。因此，本项目以石墨烯为填料加入聚乙烯基体中，以熔融共混的方法制备导热复合材料。改性后的复合材料与聚乙烯相比导热系数明显提高，其力学强度和热稳定性也有很大程度的提高。关键词：聚乙烯；石墨烯；高分子导热材料；复合材料毕业设计（论文）外文摘要TitlePreparationandpropertiesofpolyethylenethermalconductivecompositesAbstractAtpresent,researchersmainlyusetwomethodstoimprovethethermalconductivityofpolymermaterials.Thefirstoneistoprepareintrinsicheat-conductingpolymermaterial,sothatthematerialitselfhashighthermalconductivity.Thesecondoneistoaddfillerstopreparefillerthermalconductivecomposites.Theintrinsicheat-conductingpolymermaterialhashighrequirementsontechnologyandisdifficulttobeindustrialized.Incontrast,addingthermalconductivityfillertothematrixisasimpleandeffectivemethod.Duetoitsuniquetwo-dimensionalstructureandproperties,suchaszero-gapstructure,highelectronmobilityandhighthermalconductivity,graphenehasapromisingprospectforpolymermodificationasathermalconductivefiller.Therefore,inthisproject,graphenewasusedasthefillertoaddpolyethylenematrixtopreparethermalconductivecompositesbymeltingandblending.Comparedwithpolyethylene,thethermalconductivityofthemodifiedcompositematerialwasobviouslyimproved,anditsmechanicalstrengthwasalsogreatlyimproved.Keywords：Polyethylene;graphene;polymerheatconductingmaterial;compositematerials目录1引言.................................................................................................................................11.1研究背景......................................................................................................................11.2聚乙烯..........................................................................................................................21.3石墨烯..........................................................................................................................31.3.1机械剥离法...............................................................................................................31.3.2外延生长法...............................................................................................................31.3.3化学剥离法...............................................................................................................31.3.4气相沉积法...............................................................................................................41.3.5还原石墨烯氧化物...................................................................................................41.4导热机理......................................................................................................................41.4.1石墨烯导热机理.......................................................................................................41.4.2聚合物的导热机理...................................................................................................51.4.3石墨烯在聚合物中的导热机理..............................................