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Emulsion Polymerization of Vinyl Acetate at Low Temperatures
Author(s) -
Shiau RhongChau,
Yamaguchi Tadashi
Publication year - 1970
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.197000022
Subject(s) - chemistry , polymerization , vinyl acetate , saponification , emulsion polymerization , ammonium persulfate , polymer chemistry , chain transfer , potassium persulfate , polyvinyl acetate , acetonitrile , persulfate , solution polymerization , radical polymerization , organic chemistry , polymer , copolymer , catalysis
Polymerization of vinyl acetate (VAc) was carried out with potassium persulfate (KS) and ammonium sulfite as redox initiator in the presence of acetonitrile for the purpose of preparation of polyvinyl alcohol (PVA) of desired degree of polymerization (DP). The PVA obtained by this method at 0°C showed higher DP and lower solubility in water. It was observed that acetonitrile was a useful chain transfer agent in this polymerization system. It was also observed that ZnCl 2 accelerated the polymerization of VAc and the over‐all activation energy of polymerization was 9.73 Kcal / mol . However, the stereoregularity of PVA obtained by the saponification of PVAc in this system was not improved by the presence of ZnCl 2 .