Effect Of Aln On The Thermal Conductivity And Mechanical Properties Of EPDM Rubber

With science and technology developing, the thermal conductive rubbers with good comprehensive properties have become an important research direction in the field of rubber. In this article,40nm and1μm AlN were used as thermal conductive fillers of EPDM rubber, and the influence of filler amount and particle size on the thermal conductivities and mechanical properties of EPDM rubber was studied. In order to improve the thermal conductivities of composites, the surface of AlN (40nm/1μm) was coated by phenol formaldehyde resin (PF) and treated by silane coupling agent A-171. Through tested the contact angle and surface free energy, TGA and FTIR analysis of AlN and modified AlN, the influence filler amount and the surface treatment of AlN on the thermal conductivities and mechanical properties of composites material were also investigated.The results show that with the increase of the AlN, the thermal conductivities of composites are all on the rise, while the tensile strength decreased in different degree and hardness increase. And the thermal conductivities difference of the two kinds of composites was very close.Through the surface of AlN coated by phenol formaldehyde resin, the surface free energy of modified AlN was reduced, while thermal stability increased. The thermal conductivities of the two kinds of composites were both improved, while the tensile strength decreased in different degree and hardness increase. When the mass ratio of AlN to PF was4:1, the two kinds of composites have the best comprehensive performance. The thermal conductivities of EPDM rubber filled40nm AlN was better than composites filled1μm AlN.The surface free energy of40nm and1μm modified AlN were lower than unmodified. The Al-O-Si covalence bond was formed on the surface of AlN. The thermal conductivities of the two kinds of composites were both increased, while the tensile strength decreased and hardness increase. When silane coupling agent A-171content is2%, the two kinds of EPDM rubber have the best comprehensive performance. The thermal conductivities of EPDM rubber filled40nm AlN was better than composites filled1μm AlN.