ANIONIC POLYMERIZATION WITH COMPLEX BASE. I. POLYMERIZATION OF PHENYLISOCYANATE

• Published in: Journal of macromolecular science. Part A, Pure and applied chemistry Vol. 38; no. 5-6; pp. 559 - 576
• Main Authors: Usanmaz, Ali, Çevik, N. Nurçin
• Format: Journal Article
• Language: English
• Published: Colchester Taylor & Francis Group 30.04.2001; Taylor & Francis
• 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; Bulk polymerization; Molecular structure; Priming activity; Isocyanate polymer; Experimental study; Lattice parameters; Solution polymerization; Organic salt; Anionic catalyst; Carboxylate; Anionic polymerization; Sodium Amides; Crystalline structure
• ISSN: 1060-1325; 1520-5738
• DOI: 10.1081/MA-100103590

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.