ANIONIC POLYMERIZATION WITH COMPLEX BASE. I. POLYMERIZATION OF PHENYLISOCYANATE

In this work, phenylisocyanate was polymerized in bulk and in a solution of THF by the complex base (CB), NaNH 2 /(CH 3 ) 3 CONa catalyst under vacuum. The percent yield for bulk polymerization at −20°C first increased with a slow rate reaching 32% conversion in 3 hours, then with a greater rate up...

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Bibliographic Details
Published in:Journal of macromolecular science. Part A, Pure and applied chemistry Pure and applied chemistry, 2001-04, Vol.38 (5-6), p.559-576
Main Authors: Usanmaz, Ali, Çevik, N. Nurçin
Format: Article
Language:English
Subjects:
Applied sciences
Complex base
Exact sciences and technology
Ionic polymerization
Monoisocyanade
Organic polymers
Physicochemistry of polymers
Polymerization
Preparation, kinetics, thermodynamics, mechanism and catalysts
Sodium amide
Sodium isobutoxide
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Summary:In this work, phenylisocyanate was polymerized in bulk and in a solution of THF by the complex base (CB), NaNH 2 /(CH 3 ) 3 CONa catalyst under vacuum. The percent yield for bulk polymerization at −20°C first increased with a slow rate reaching 32% conversion in 3 hours, then with a greater rate up to 86% in 6 hours. However, at 0°C the yields were relatively smaller and not very reproducible. The product obtained was a high molecular weight polymer, insoluble in most solvents, and partially crystalline. The polymerization in THF at −20° gave 58% conversion in 9 hours with a high rate first, then a slower rate. The polymer samples were characterized by fractionation, FT-IR, DSC, NMR, TGA, and X-ray powder diffraction. The polymer samples in the solution polymerization contained trimer and oligomeric components. No glass transition temperature was observed at the temperature interval studied.
ISSN:1060-1325
1520-5738
DOI:10.1081/MA-100103590