Preparation of star-shaped polylactide with pentaerythritol and stannous octoate

The ring‐opening polymerization of L‐lactide with stannous octoate was investigated in the presence of pentaerythritol. By this way it was possible to prepare higher molecular weight star‐shaped poly(L‐lactide)s compared with the linear ones obtained by stannous octoate only. The weight‐average mole...

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Bibliographic Details
Published in:Die Makromolekulare Chemie 1993-12, Vol.194 (12), p.3229-3236
Main Authors: Kim, Soo Hyun, Han, Yang-Kyoo, Ahn, Kwang-Duk, Kim, Young Ha, Chang, Taihyun
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Polymerization
Preparation, kinetics, thermodynamics, mechanism and catalysts
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Summary:The ring‐opening polymerization of L‐lactide with stannous octoate was investigated in the presence of pentaerythritol. By this way it was possible 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 polymers were lower than those of the linear ones, which confirms the star‐shaped architecture.
ISSN:0025-116X
0025-116X
DOI:10.1002/macp.1993.021941202