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Anionic polymerization with complex base. I. Polymerization of phenylisocyanate
Date
2001-01-01
Author
Usanmaz, Ali
Cevik, NN
Metadata
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In this work, phenylisocyanate was polymerized in bulk and in a solution of THF by the complex base (CB), NaNH2/(CH3)(3)CONa catalyst under vacuum. The percent yield for bulk polymerization at -20 degreesC 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 degreesC 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 degrees 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.
Subject Keywords
Monoisocyanade
,
Complex base
,
Ionic polymerization
,
Sodium amide
,
Sodium isobutoxide
URI
https://hdl.handle.net/11511/57426
Journal
JOURNAL OF MACROMOLECULAR SCIENCE-PURE AND APPLIED CHEMISTRY
DOI
https://doi.org/10.1081/ma-100103590
Collections
Graduate School of Natural and Applied Sciences, Article