Living ring-opening polymerization of ?-caprolactone with combinations of tert-butyllithium and bilky aluminium phenoxides |
| |
| Authors: | Tatsuki Kitayama Hiroko Yamaguchi Takeshi Kanzawa Tomohiro Hirano |
| |
| Affiliation: | (1) Department of Chemistry, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan e-mail: kitayama@chem.es.osaka-u.ac.jp; Tel: 06-6850-6230; Fax: 06-6841-0104, JP |
| |
| Abstract: | Summary
The polymerization of ɛ-caprolactone (ɛ-CL) with a combination of tert-butyllithium (t-BuLi) and bis(2,6-di-t-butylphenoxy)methylaluminum MeAl(ODBP)2] in toluene at 0°C proceeded in a living manner to give polymers with narrow molecular weight distributions (MWD) within
a few minutes, while the polymerization with t-BuLi alone gave a polymer with much broader MWD. The yield of the polymer did not reach 100 % at the Al/Li ratio of 5, because
the excess MeAl(ODBP)2 coordinates with ɛ-CL to protect it from the attack by the propagating species. The polymerization with t-BuLi/EtAl(ODBP)2 gave polymers in quantitative yields regardless of Al/Li ratio, and also narrower MWD even for higher molecular weight polymers.
Received: 1 August 2000/Accepted: 11 August 2000 |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
