Polymerization of lactams, 88. Copolymers poly(ϵ-caprolactam)-block-polybutadiene prepared by anionic polymerization, part III. Model polymerizations initiated with potassium salt of ϵ-caprolactam and accelerated with isocyanates and their derivatives
✍ Scribed by Roman Sobotík; Radim Šrubař; Jan Roda
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 856 KB
- Volume
- 198
- Category
- Article
- ISSN
- 1022-1352
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✦ Synopsis
Abstract
Anionic polymerization of ϵ‐caprolactam was initiated with the potassium salt of ϵ‐caprolactam and accelerated with phenyl isocyanate, toluylene diisocyanate, 4,4′‐diphenylmethane diisocyanate, some derivatives of these isocyanates (urethanes, ureas, and allophanates), or combinations of phenyl isocyanate with its derivatives at 150°C. The effect of individual structures on the polymerization kinetics and their contribution to the preparation of block copolymers of ϵ‐caprolactam with hydroxy‐terminated prepolymers, in‐situ functionalized with diisocyanates, are discussed on the basis of a detailed analysis of time functions of polymer yield and degree of polymerization.