Study On Preparation And Properties Of H-BN/PP Thermal Conductive Polymer Composites

In recent years,with continuous development of scientific progress,each field in national economy has increasingly requirement for the performance of thermal conductive materials,while traditional thermal conductive materials have different insurmountable defects which is difficult to satisfy the requirement of modern industry for the functional diversity of thermal conductive materials.Therefore,developing new-type thermal conductive composites for different application fields has become the main research direction and active demand of thermal conductive materials.Polymer materials have played more and more important role in every field by excellent comprehensive performance.However,most polymer materials are poor conductor of thermal which restricts the their application in industry and national economy.So,giving certain thermal conductive property to polymer materials will widen their application fields especially in thermal conductive and thermal-dissipation industry.Usually take filling polymer materials with thermal conductive fillers to improve thermal conductive property of polymer materials to produce thermal conductive polymer composites with excellent comprehensive performance.This paper chooses polypropylene(PP)as the polymer matrix,filling with carbon nanotube,graphene and hexagonal boron nitride(h-BN)as fillers,preparing carbon nanotube/PP,graphene/PP and h-BN/PP composites by twin-screw extrusion reaction and tests the mechanical properties and thermal conductivity and researches the effects of filler variety,crystal form and filler rate on mechanical and thermal conductive property of the composites.According to the experiment,h-BN,graphene and carbon nanotube can increase parts of mechanical properties of the composites and with the same filler rates,h-BN shows more excellent comprehensive performance to increase mechanical properties of composites;high-crystallized,middle-crystallized,and low-crystallized h-BN can increase parts of mechanical properties of the composites and with the same filler rates,middle-crystallized structure shows more excellent comprehensive performance to increase mechanical properties of composites;the effects on mechanical properties of composites are different as h-BN filler rates increase;high-crystallized,middle-crystallized,and low-crystallized h-BN can increase thermal conductivity of composites and with the same filler rates,high-crystallized structure shows more excellent promotion performance to thermal conductivity of composites because of high thermal conductivity and large partical size;thermal conductivity of composites increases as filler rates increase.