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Ring-opening polymerization of chloromethylthiirane with SO42−/TiO2/Nd3+ as initiator

✍ Scribed by Zhiquan Shen; Weishi Li; Fuyao Zhang; Yifeng Zhang; Lianfang Shen; Hanzhen Yuan

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
216 KB
Volume
18
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

A new type of solid superacid (SO~4~^2−^/TiO~2~/Nd^3+^) was used for the ring‐opening polymerization of chloromethylthiirane (CMT). TiO~2~ · H~2~O immersed in a sulfuric acid solution containing Nd^3+^ ions and calcined at 600°C gave the solid superacid for initiating the polymerization of CMT. The effects of polymerization temperature and amount of the initiator on the CMT polymerization were studied. Poly(CMT) obtained has higher molecular weight (M̄~w~ = 52 000) than ever reported.

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Poly (1,3-dioxepane) [PDOP] triol was prepared by cationic ring-opening polymerization with [C 2 H 5 C(CH 2 OCH 2 CH 2 CO ϩ ClO 4 Ϫ ) 3 ], trioxocarbenium perchlorate, as an initiator. The structures of the PDOP triols obtained were verified by 1 H-NMR, FTIR, and GPC results. Initiation, propagation