pv Limit and Frictional Surface Behavior of Bronze Powder Filled Polyacetal/Polyethylene(LDPE, HDPE, HMWHDPE) Blends
Hiromasa TAKAHASHI and Atsushi SAITO
Abstract:To improve the pv limit of polymers, filled polyacetal （POM） and POM/polyethylene （PE） blends were studied. The fillers used were amino silane coupling agent treated and untreated bronze powder. And low density polyethylene （LDPE）, high density polyethylene （HDPE） and high molecular weight high density polyethylene （HMWHDPE） were used as blended polymers in POM. Sliding tests were performed in a thrust washer type testing apparatus under unlubricated conditions. Frictional surfaces of a slider and specimens were investigated by XPS, EPMA and FT-IR. The additions of bronze powder and PE （LDPE, HDPE） in POM remarkably improved pv limit. The inclusion of bronze powder in POM/PE （LDPE, HDPE, HMWHDPE） blends and treating its bronze powder with amino silane coupling agent raised pv limit. And the pv limit of POM+25mass%HDPE+20mass%Br （treated） was approximately six times higher than that of POM. It was suggested that the POM film and the POM/PE mixed film produced in the frictional interface contributed to the elevation of pv limit. Key Words:pv limit, POM，POM/PE （LDPE，HDPE，HMWHDPE） blends，Bronze powder, Coupling agent, Transfer film