关键词: 退火, 力学性能, 动态力学性能

Abstract: The effect of annealing on the mechanical and dynamic mechanical properties of injection mold polycarbonate part has been investigated. The results revealed that the residual stress of the polycarbonate injection products tend to reduce due to rearrangement of orientation molecular chains by annealing. Mechanical properties of the products were improved except breaking elongation, with yield strength increased by 14.86%, flexural strength by 12.7%, flexural modulus by 21.27%, impulse strength by17.93%. Dynamic mechanical analysis showed that distortion temperature was increased and residual stresses existed in the products. The change trend of storage modulus of annealed products with scanning temperature was smoother and steadier than that of unannealed products due to molecule chains relaxation. Residual stress in the products changed with scanning frequency at a range of 35HZ to 60HZ during frequency scanning. Residual stress in the products changed with scanning frequency at a range of 35HZ to 60HZ during frequency scanning. Due to residual stresses reducing, the capable of responding to residual stresses was decreased during the scanning temperature increasing.

Key words: annealing, mechanical property, dynamic mechanical property