Heat Resistance Modification Of Ultra-high Molecular Weight Polyethylene

Ultra-high molecular weight polyethylene has very excellent comprehensiveperformance, but its low thermal deformation temperature (85℃), which limits itsapplication in high temperature environment.To improve the heat resistantperformance of ultra-high molecular weight polyethylene based on the mainperformance of its, filling modification method was adopted for heat resistantmodification and kaolin, calcium carbonate, titanium dioxide and glass beads werechose as filler. Vicat softening point, tensile strength, elongation at break and notchedimpact strength of composite material is tested through experiments, Four kinds ofmaterials were compared, and the effect of different mass fraction of the same kind offiller were analyzed,changes of various performance indicators were analyzed inprinciple.The results show that Ultra-high molecular weight polyethylene heat resistancewas improved obviously by filling modification of four kinds material. Vicatsoftening temperature of the material increased with the increase of the content offiller, and the trend of rising gradually slow. When the mass fraction of10%, vicatsoftening temperature was all up to more than100℃, about20℃were increased;When the mass fraction of30%, vicat softening temperature was all up to more than110℃, about30℃were increased.Vicat softening temperature of the blend madeof titanium dioxide and UHMWPE is the lowest, about110℃; Vicat softeningtemperature of the blend made of kaoline and UHMWPE is the highest, about114℃. Its mechanical properties are reduced in different degree, the mechanicalproperties of composite materials is best, when the filler mass fraction is between10%and20%. Later, with the increase of adding proportion, its mechanical performancedecreases. In a word, the heat resistant performance of ultra-high molecular weightpolyethylene is greatly increased by four kinds of material filling modification.When the filler mass fraction is between10%and20%, it can satisfy the application of ultra-high molecular weight polyethylene under high temperature environment, and toguarantee the need of its mechanical properties and process performance.