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First observation of equilibrium polymerization of cyclic sulfite

✍ Scribed by Natsuhiro Azuma; Fumio Sanda; Toshikazu Takata; Takeshi Endo

Publisher: John Wiley and Sons
Year: 1997
Tongue: English
Weight: 170 KB
Volume: 35
Category: Article
ISSN: 0887-624X
DOI: 10.1002/(sici)1099-0518(19971115)35:15<3235::aid-pola16>3.0.co;2-c

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✦ Synopsis

Cationic polymerization of a seven-membered cyclic sulfite ( 7CS) was carried out with methyl trifluoromethanesulfonate as a catalyst in chlorobenzene. The final conversions of 7CS were 22, 41, 52, and 60% in the polymerizations at 25ЊC with the initial monomer concentrations of 3, 4, 5, and 6 M, respectively. The calculated monomer concentration at equilibrium was evaluated as 2.4M in any case. The conversion of 7CS decreased as the polymerization temperature rose. These results support the fact that this polymerization is an equilibrium one. DH 0 and DS 0 in the polymerization were evaliuated as 00.765 kcal/mol and 04.18 cal/mol by Dainton's equation, respectively.

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