Mechanical and Rheological Properties of HDPE/Graphite Composite with Enhanced Thermal Conductivity

摘要

Having been treated with coupling agent and pan-milling, graphite is incorpc rated into HDPE to make a HDPE/graphite composite with enhanced thermal COI1 ductivity as well as good mechanical properties and processibility .This paper fc cuses on the study of mechanical properties, thermal stability and rheologic~ behavior ofHDPE/graphite composite. The experimental results show that with iI1 crease of the graphite content, Young's modulus of HDPE/graphite increases an the elongation at break and impact strength decrease. However, when the graphit content is 35% in HDPE/graphite, the elongation at break and impact strength sti remain 22.4% and 85.&1 /m, respectively. Also, the yield strength increases wit the increase of the graphite content, and reaches the maximum at 55% graphit content, and reduces afterwards. The crystallization temperature and thermal sic bility of HDPE/ graphite increase with the increase of the graphite content. The me viscosity of the filled HDPE remains almost unchanged, but the shear sensitivity ir creases, and the temperature sensitivity decreases with the increase of the graphi1 content. By optimizing the experimental conditions, a HDPE/graphite composi1 with fairly good comprehensive properties such as enhance3 thermal conductivi1 and stability , good mechanical properties, and processability could be prepare( which has potential application in the field of heat transfer .