Preparation And Properties Of Highly Thermal Conductive Polyurethane Elastomer

Polyurethane is widely used in elastomers coatings, rubber rollers, rollers, adhesives,etc. because of its a series of excellent performance, such as high mechanical strength,chemical inertness, high wear resistance, good performance at high or low temperatures. Inaddition, in recent years due to the rapid development of science and technology,polyurethane has been more and more used in heavy machinery, high-power electricalappliances and electronic products, etc., and in the process of using these products willalways have a lot of heat, if this heat cannot timely export, is bound to have a negativeimpact on the effects of polyurethane elastomer material, not only can reduce the servicelife of polymer materials, it can also cause safety accidents. Therefore, the preparation withgood thermal conductivity and mechanical properties of polyurethane materials is a hot spotin the present study.Because of the weakness of thermal conductivity of polyurethane elastomers, thefillers based on carbon with outstanding mechanical properties and thermal conductivity,including carbon fiber, muti-wall carbon nanotubes and graphene oxide/muti-wall carbonnanotubes composites was used as fillers to be prepared polyurethane composites by in situpolymerization. The influence of fillers on the properties of polyurethane elastomers wasanalyzed by infrared spectrum (FTIR) testing, mechanical property testing, thermalperformance test, and scanning electron microscopy (SEM) test. Finally draws thefollowing conclusion:(1)The results of study of carbon fiber/polyurethane elastomer composites showed that:when the carbon fiber concentration was0.3wt%, the thermal conductivity was0.1385W/m· K with the increasment of26.4%. At the same time, the tensile strength increased by 27.8%,100%and300%stretching strength increased by76.4%and102.1%respectively,and tear strength increased by32.2%, while the elongation at break decreased only19.5%.(2) The results of study of multi-wall nanotubes/polyurethane elastomer compositesshowed that: when the multi-wall nanotubes concentration was0.5wt%, the thermalconductivity is0.1775W/m·K, increased by62%. The tensile strength increased by26.8%; the tear strength increased by44.6%; and the300%stretching strength increased by100%.(3) Graphene oxide/multi-walled carbon nanotube/polyurethane elastomer compositematerials research has shown that compared with pure polyurethane elastomer, when thecarbon nanotubes and graphene oxide ratio of1:1and filling amount of1wt%, the thermalconductivity increased by85.3%; the tensile strength can be increased by45.5%;100%and300%stretching strength increased by145%and145%respectively; the elongation at breakdecreased is only11%; and tear strength increased by38.2%.