Preparation method of polyvinyl chloride and chlorinated polyvinyl chloride

The invention provides an improved method for realizing vinyl chloride monomer polymerization in a supercritical carbon dioxide system, and the method can adopt traditional supercritical carbon dioxide polymerization equipment without additionally increasing device investment; the obtained polyvinyl chloride has relatively high molecular weight and relatively narrow molecular weight distribution, and the polymer maintains good heat resistance by adopting reasonable type and input amount of the chain transfer agent; the invention further provides a method for preparing chlorinated polyvinyl chloride in a one-pot mode, and the chlorination rate of polyvinyl chloride is high. 本发明提供一种改进的在超临界二氧化碳体系中实现氯乙烯单体聚合的方法，所述方法可以采用传统的超临界二氧化碳聚合设备，不额外增加装置投资；所得聚氯乙烯具有较高的分子量、分子量分布相对较窄，并且通过采用合理的链转移剂种类与投入量而使聚合物维持了良好的耐热性；进一步提供采用"一锅煮"的方式制备氯化聚氯乙烯的方法，聚氯乙烯的氯化率较高。