Three types of special material for polyethylene(PE)pipe(PEX-1,PE100,PERT-I)were used as research objects to conduct water bath aging tests at 95℃.Their thermal-oxydative aging property,thermal deformation behavior and tensile strength were studied using differential scanning calorimeter(DSC),Vicat softening temperature tester,and universal testing machine.The results show that after being aged in a water bath at 95℃ for 1 440 h,among the three samples,PERT-I has the smallest change in crystallinity(2.16%),the smallest change in oxidation induction time(OIT)(2.70%)and the smallest change in Vicat softening point temperature(0.28%),showing excellent heat and oxygen aging properties and thermal deformation properties.At the same time,the tensile strength change rate and yield strength change rate of PERT-I are 15.06%and 15.16%respectively,It can be used as an alternative material for the inner lining of high-temperature resistant PE pipes.
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