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Lanthanoid isopropoxide as a novel initiator for anionic polymerization of isocyanates

✍ Scribed by Naoko Fukuwatari; Hiroshi Sugimoto; Shohei Inoue

Publisher: John Wiley and Sons
Year: 1996
Tongue: English
Weight: 390 KB
Volume: 17
Category: Article
ISSN: 1022-1336
DOI: 10.1002/marc.1996.030170101

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✦ Synopsis

Lanthanum isopropoxide was found to serve as a novel anionic initiator for the polymerization of hexyl isocyanate affording poly(hexy1 isocyanate) with very high molecular weight (M, > lo6) under appropriate conditions. Other lanthanoid alkoxides, such as samarium, ytterbium and yttrium isopropoxides, also brought about the polymerization of hexyl isocyanate. Butyl, isobutyl, octyl and m-tolyl isocyanates also underwent the polymerization reaction to form the corresponding polymers by using lanthanum isopropoxide as initiator, while polymerizations of tert-butyl and cyclohexyl isocyanates with lanthanum isopropoxide did not occur under identical conditions.

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