Abstract
In suspension polymerization of vinyl chloride a emulsion which contains polyvinyl chloride powder is formed, because polyvinyl chloride is insoluble in vinyl chloride monomer and it is separated out. In order to investigated mechanism of formation of this emulsion, authors observed the phase inversion of emulsion which involves benzene and vinyl chloride monomer as oil phase, polyvinyl chloride power as solid phase, and various surface active agents as suspending agents. Type of emulsion is changed from water in oil (W/O) to oil in water (O/W), as wettability of polyvinyl chloride powder to the oil phase varies with content of suspending agent. Nonionic and anionic synthetic surface active agents have a wider range for the W/O type formation and have a lower stability of emulsion than the high polymeric surface active agents. Also, authors recognized that these phenomenons are reproduced in the suspension polymerization of vinyl chloride whereby the same surface active agents are used as suspending agenst.
