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Cationic ring‐opening polymerization behavior of an aliphatic seven‐membered cyclic carbonate, 1,3‐dioxepan‐2‐one
Author(s) -
Matsuo Jyuhou,
Sanda Fumio,
Endo Takeshi
Publication year - 1998
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(19980101)199:1<97::aid-macp97>3.0.co;2-d
Subject(s) - cationic polymerization , polymerization , chemistry , polymer chemistry , ring opening polymerization , chain growth polymerization , nitrobenzene , ionic polymerization , carbonate , radical polymerization , polymer , organic chemistry , catalysis
Synthesis and cationic ring‐opening polymerization of a seven‐membered cyclic carbonate, 1,3‐dioxepan‐2‐one ( 1 ), were examined. The cationic ring‐opening polymerization of 1 proceeded without decarboxylation at 20°C to give the corresponding polycarbonate, differently from a six‐membered cyclic carbonate ( 2 ), for which polymerization is generally accompanied by partial elimination of carbon dioxide. The observed polymerization rate of 1 in nitrobenzene was about 1.3 times faster than that in dichloromethane. The observed pseudo first‐order polymerization rate constants of 1 and 2 at 20°C were determined to be 4.15 × 10 −4 and 4.16 × 10 −6 S −1 , respectively. The observed polymerization rate of 1 was 100 times larger than that of 2 . The activation energies in the polymerization of 1 and 2 were estimated to be 6.27 and 8.52 kcal/mol, respectively.