Development of UHMWPE Modified PP/PET Blends and Their Mechanical and Abrasive Wear Behavior

摘要

In this study,polypropylene and polyethylene terephtha-late blend were modified by incorporating different percentages of ultrahigh molecular weight polyethylene(UHMWPE)ranging from 1 to 5 phr.Modified blends were prepared by melt mixing the PP/PET blend and UHMWPE.Ultimate tensile strength of UHMWPE filled blend was determined at 10,20,50,and 100 mm/min cross head speeds of testing.It was found that increase of cross head speed from 10 to 100 mm/min increases the tensile strength of PP/PET/UHMWPE blends.Maximum ultimate tensile strength is exhibited by the blend containing 2 phr UHMWPE.Breaking strain of the UHMWPE modified and unmodified PP/PET blend increased with the increase of cross head speed due to the highly entangled chain structure of UHMWPE.Shore A hardness of the filled blends also increased from 341 to 356,which is highest for 2 phr UHMWPE.High stress abrasive wear of UHMWPE modified blend was determined by using Suga abrasion tester,model NUS-1 Japan.Wear rate of the PP/PET(90/10)blends having 1,2,and 5 phr of UHMWPE was determined at different loads such as 1,3,5,and 7 N and sliding distances from 6.4 m to 25.6 m.Wear rate values show that UHMWPE has prominent effect on abrasive wear of PP/PET blends.Addition of 2 and 5 phr UHMWPE improved the wear resistance of PP/PET blends at different loads,which has been explained on the basis of improved bonding as compared with pure PP/PET blend and increased hardness.Maximum abrasive wear rate reduction was achieved by adding 2 phr UHMWPE in PP/PET(90/10)blend.