Preparation and application of low molecular weight poly(vinyl chloride). II. Thermal stability of blended poly(vinyl chloride)

摘要

AbstractThe blending effect of poly(vinyl chloride) (PVC) with relatively higher molecular weight (HMW‐PVC) and relatively lower molecular weight (LMW‐PVC) has been investigated by measuring various thermal stability and fusion times. The thermal stability of the blended PVC is improved when the small amount of LMW‐PVC obtained using mercapto compounds as a chain‐transfer agent is blended into PVC with HMW‐PVC. At the LMW‐PVC content from about 5–30 wt , the thermal stability of the blended PVC is much more improved. Furthermore, the blended PVC with LMW‐PVC, obtained using mercapto compounds, exhibits significant improvement in the discoloration time. The fusion time of the blended PVC is related to the weight‐average polymerization degree of LMW‐PVC and the LMW‐PVC content. © 199