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Ionic graft copolymerization. I. Homopolymerization of β‐propiolactone by sodium acetate catalyst
Author(s) -
Shiota Tetsuya,
Goto Yutaka,
Hayashi Koichiro
Publication year - 1967
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1967.070110601
Subject(s) - polymerization , monomer , chemistry , polymer chemistry , copolymer , catalysis , chain transfer , degree of polymerization , sodium , chain growth polymerization , polymer , organic chemistry , radical polymerization
The polymerization of β‐propiolactone (βPL) by sodium acetate catalyst has been investigated. The polymerization behavior with monomer purified with calcium chloride was found to be a little different from that previously reported for this monomer. That is, poly‐β‐propiolactone (PβPL) obtained from βPL dried with CaCl 2 has a higher degree of polymerization than that obtained from conventionally treated βPL, and its infrared spectrum shows type II configuration, which differs from that reported in previous papers. Some chain transfer reaction is observed even for the polymerization of the CaCl 2 –dried βPL; however, this is less important in toluene. The electronegativity of the anion or cation in catalyst greatly influences the rate of polymerization.