Anionic polymerization with complex base. I. Polymerization of phenylisocyanate

Date

2001-01-01

Author

Usanmaz, Ali
Cevik, NN

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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

Collections

Graduate School of Natural and Applied Sciences, Article