PREPARATION OF STAR-SHAPED POLYLACTIDE WITH PENTAERYTHRITOL AND STANNOUS OCTOATE

Authors
KIM SH HAN YK AHN KD KIM YH CHANG T
Citation
Sh. Kim et al., PREPARATION OF STAR-SHAPED POLYLACTIDE WITH PENTAERYTHRITOL AND STANNOUS OCTOATE, Die Makromolekulare Chemie, 194(12), 1993, pp. 3229-3236
Citations number
26
Categorie Soggetti
Polymer Sciences
Journal title
Die Makromolekulare Chemie → ACNP
ISSN journal
0025116X
Volume
194
Issue
12
Year of publication
1993
Pages
3229 - 3236
Database
ISI
SICI code
0025-116X(1993)194:12<3229:POSPWP>2.0.ZU;2-C
Abstract
The ring-opening polymerization of L-lactide with stannous octoate was investigated in the presence of pentaerythritol. By this way it was p ossible to prepare higher molecular weight star-shaped poly(L-lactide) s compared with the linear ones obtained by stannous octoate only. The weight-average molecular weights of linear and star poly(L-lactide)s were measured by light scattering analysis from hexafluoro-2-propanol solution, and the respective Mark-Houwink equations were derived. The second virial coefficient and the intrinsic viscosity of the star poly mers were lower than those of the linear ones, which confirms the star -shaped architecture.