The Aging of Modified Glass Fiber-Reinforced Polypropylene in Air and in Antifreeze

摘要

Comparative behavior of modified and unmodified glass-reinforced polypropylene during aging in air (135degC) and in antifreeze(1150degC) with the exposure up to 80 days was in-vestigated.Mechanical properties(tensile strength,flexural strength,impact strength)and melt flow were measured for original and aged samples.According to Hg-porosimetry data,unmodified composite has a loose macroporous structure.Aging leads to progressive phase separation.On the contrary,original modified composite is characterized by a dense separation.On the contrary,original modified composite is characterized by a dense structure;aging leads to the structure compacting,pore size decreasses.Unmodified composite displays a drastic decrease of mechanical properties after 10 days of heating.Modified thermostabilized glass-filled polypropylene holds its thermooxidative stability during aging in air and in antifreeze,its molecular weight characteristics remain practically constant.