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Living Ring‐Opening Polymerization of Cyclic Esters with Epoxide‐Derived Titanium Alkoxides
Author(s) -
Asandei Alexandru D.,
Saha Gobinda
Publication year - 2005
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200400644
Subject(s) - ring opening polymerization , polymerization , epoxide , ring (chemistry) , polymer chemistry , copolymer , living polymerization , catalysis , chemistry , living free radical polymerization , materials science , radical polymerization , organic chemistry , polymer
Summary: The Ti III Cp 2 Cl‐catalyzed radical ring opening of epoxides produces Ti alkoxides which initiate the ring‐opening polymerization of ε ‐caprolactone. A linear dependence of $\overline M _{\rm n}$ on conversion, linear kinetics, low $\overline M _{\rm w} /\overline M _{\rm n}$ values, and the synthesis of block copolymers demonstrate a living process, while NMR spectroscopy confirms the presence of the initiator chain end. Epoxides are thus introduced as a new class of initiators for the Ti‐catalyzed living ring‐opening polymerization of cyclic esters.The TiCp 2 Cl‐catalyzed radical ring opening of epoxides followed by the initiation of the living ring‐opening polymerization of ε ‐caprolactone.