Effect of annealing on mechanical and dynamic mechanical properties of polycarbonate injection molding product

The effect of annealing on the mechanical and dynamic mechanical properties of injection mold polycarbonate part was investigated.The results revealed that the residual stress of the polycarbonate injection products tended 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 by 17.93%.Dynamic mechanical analysis showed that distortion temperature increased and residual stresses existed in the products.The change 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 35 Hz to 60 Hz during frequency scanning.Residual stress in the products changed with scanning frequency at a range of 35 Hz to 60 Hz during frequency scanning.Due to residual stress reduction,the capability responding to residual stresses decreased with increasing scanning temperature.