The mechanochemical degradation, morphology and crystalline structure changes of PVC during jet milling as well as their effects on mechanical properties of PVC were studied through GPC, FT IR, SEM, physical and mechanical property tests. The experimental results show that during jet milling, the molecular weight of PVC will be decreased; its crystalline structure shanges somewhat, the particle size and apparent density of PVC will be decreased, the specific surface area is increased, the processability ...