The optimal reaction temperature and reaction time for the synthesis of polyvinyl chloride PVC from vinyl chloride monomer VCM can vary depending on the specific polymerization process used. However, generally speaking, the polymerization of VCM to PVC is carried out through suspension, emulsion, or bulk polymerization processes.For suspension polymerization, the optimal reaction temperature is typically in the range of 40-60C 104-140F , and the reaction time can vary from a few hours to several days, depending on the desired molecular weight and degree of polymerization. A common reaction time for this process is around 8-12 hours.For emulsion polymerization, the optimal reaction temperature is usually between 50-70C 122-158F , and the reaction time can range from several hours to a few days, again depending on the desired properties of the final product. A typical reaction time for this process is around 12-24 hours.For bulk polymerization, the optimal reaction temperature is often higher, in the range of 60-90C 140-194F , and the reaction time can be shorter, from a few hours to a day. A common reaction time for this process is around 4-8 hours.It is important to note that these are general guidelines, and the specific optimal conditions for a given PVC synthesis may vary depending on factors such as the choice of catalyst, initiator, and other reaction parameters. To achieve the highest possible yield and purity, it is crucial to carefully control and optimize these factors for the specific polymerization process being used.