Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.polymer.2007.12.017
Title: Controlled synthesis and characterizations of amphiphilic poly[(R,S)-3-hydroxybutyrate]-poly(ethylene glycol)-poly[(R,S)-3-hydroxybutyrate] triblock copolymers
Authors: Liu, K.L. 
Goh, S.H. 
Li, J. 
Keywords: Anionic ring opening polymerization
Poly(ethylene glycol)
Poly[(R)-3-hydroxybutyrate]
Issue Date: 4-Feb-2008
Citation: Liu, K.L., Goh, S.H., Li, J. (2008-02-04). Controlled synthesis and characterizations of amphiphilic poly[(R,S)-3-hydroxybutyrate]-poly(ethylene glycol)-poly[(R,S)-3-hydroxybutyrate] triblock copolymers. Polymer 49 (3) : 732-741. ScholarBank@NUS Repository. https://doi.org/10.1016/j.polymer.2007.12.017
Abstract: Well-defined biodegradable amphiphilic triblock copolymers consisting of atactic poly[(R,S)-3-hydroxybutyrate] (PHB) and poly(ethylene glycol) (PEG) as the side hydrophobic block and middle hydrophilic block were synthesized via ring opening polymerization of (R,S)-β-butyrolactone from PEG macroinitiators and characterized using NMR, GPC, FT-IR, XRD, DSC and TG analyses. The controlled synthesis was made possible by the facile synthesis of pure PEG macroinitiators through a TEMPO-mediated oxidation. Constituting 40-70 wt% of the copolymer content, PHB blocks grown were amorphous while PEG formed crystalline phase when segment was sufficiently long. While hindering PEG crystallization, atactic PHB mixed well with amorphous PEG to give single Tg in all the copolymers. The copolymers exhibited two-step thermal degradation profile starting with PHB degradation from 210 to 300 °C, then PEG from 350 to 450 °C. © 2008 Elsevier Ltd. All rights reserved.
Source Title: Polymer
URI: http://scholarbank.nus.edu.sg/handle/10635/87745
ISSN: 00323861
DOI: 10.1016/j.polymer.2007.12.017
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