Effect of perfluoroalkylmethacrylate ester-grafted-linear low-density polyethylene on the tribological property of polyoxymethylene-linear low-density polyethylene composites

In this work, perfluoroalkylmethacrylate ester (PFAMAE)-grafted-linear low-density polyethylene (LLDPE) was synthesized by UV-induced surface graft polymerization. The effect of PFAMAE-grafted-LLDPE on the tribological behavior of LLDPE-filled polyoxymethylene (POM) composite was investigated using a friction and abrasion testing machine. The results showed that LLDPE-g-PFAMAE was a more effective modifier in improving tribological property of LLDPE-filled POM composite than conventional maleic anhydride-grafted-polyethylene (PE-g-MAH). POM/LLDPE composite possessed much lower friction coefficient but higher wear rate than pristine POM. The incorporation of LLDPE-g-PFAMAE into POM/LLDPE further decreased the friction coefficient, which was 45% lower than that of POM. The wear rate of POM/LLDPE/LLDPE-g-PFAMAE composite was also reduced and was lower than that of pristine POM. The primary wear mechanisms of POM/ LLDPE composite with and without LLDPE-g-PFAMAE were adhesive and abrasive wear. POLYM. ENG. SCI., 51:925-930, 2011. [C]2011 Society of Plastics Engineers
INTRODUCTION As an engineering plastic, polyoxymethylene (POM) exhibits low friction coefficient, excellent wear resistance, good fatigue resistance, creep resistance, and high impact strength with a unique balance of mechanical, thermal, [...]