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Well‐defined polyisocyanates via organotitanium(IV) catalyzed living polymerizations of isocyanates
Author(s) -
Patten Timothy E.,
Novak Bruce M.
Publication year - 1993
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19930670116
Subject(s) - catalysis , chemistry , polymer chemistry , organic chemistry
The development of living organotitanium(IV) catalyzed polymerizations is presented. A living polymerization of alkyl isocyanates was developed using TiCl 3 OCH 2 CF 3 , I, as a catalyst, through which large quantities of well‐defined (in terms of molecular weight and polydispersity) polyisocyanates are obtainable under ambient conditions. η 5 ‐CpTiCl 2 OCH 2 CF 3 (Cp = cyclopentadienyl), II, is also an excellent catalyst for the polymerization of isocyanates and, unlike I, will polymerize monomers containing Lewis basic functional groups in the side chain. Compound II was used to synthesize poly(allyl isocyanate) and poly(2‐isocyanatoethyl methacrylate). Both polymers were found to be soluble, in contrast to previous reports, and spectroscopic characterization showed that no crosslinking of the side chains had occurred.