One of the methods to improve the thermal stability of resins
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According to the \"Comprehensive Guide to Polyvinyl Chloride,\" adding 1% to 1.5% of ethylene or copolymerizing propylene with vinyl chloride results in the formation of block copolymers. This copolymer has basically the same processing properties as the homopolymer of vinyl chloride, but its thermal stability is significantly improved. The principle is as follows: the degradation of polyvinyl chloride, and the dehydrochlorination reaction, are autocatalytic \"zipper-like\" reactions. By introducing ethylene or propylene units into the PVC polymer chain (approximately 25–50 structural units), such \"zipper-like\" dehydrochlorination reactions are prevented. Discussion: 1. Have any companies or research institutions in China attempted to do this? How effective is it? 2. If experiments are to be conducted, how can copolymerization be achieved?
There are many methods to improve the thermal stability of PVC resin, but this method is theoretically feasible; however, no PVC manufacturer has yet been known to have experience in applying it in practice. There is too little research and development, as well as too limited investment, in specialized PVC resins in our country, which is detrimental to the development of this industry.