Premium
Anionic and ionic coordinative polymerization of ϵ‐caprolactone
Author(s) -
Stere Cristina,
Iovu MihaelaCorina,
Iovu Horia,
Boborodea Adrian,
Vasilescu Dan Sorin,
Read Simon James
Publication year - 2001
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.68
Subject(s) - polymerization , polymer chemistry , caprolactone , crown ether , ether , ionic polymerization , materials science , chain transfer , polyester , potassium , carbazole , polymer , chemistry , organic chemistry , radical polymerization , ion
The polymerization of ϵ‐caprolactone initiated by two catalyst systems was studied: (1) carbazole‐potassium in the presence of 18‐crown‐6 ether and (2) NdCl 3 / TBP / TIBA (neodymiumtrichloride/tri‐n‐butyl‐phosphate/triisobutylaluminium) at the molar ratio 1/3/1. For both initiator systems conversion/time plots were determined and the polymers were characterized by IR, GPC and by 1 H ‐ and 13 C − NMR spectroscopy. Polyesters with the highest molecular weight ( M n ≅44 000 g/mol) were obtained for the polymerizations initiated by the carbazole‐potassium/18‐crown‐6 ether system. The features of the polymerization initiated by the carbazole‐potassium/18‐crown‐6 ether system are discussed on the basis of a simple scheme. The nature of this polymerization is non‐living. Copyright © 2000 John Wiley & Sons, Ltd.