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Organobase-Catalyzed Synthesis of Multiarm Star Polylactide With Hyperbranched Poly(ethylene glycol) as the Core

✍ Scribed by Martina Schömer; Holger Frey

Book ID
102941989
Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
830 KB
Volume
212
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Multiarm star copolymers consisting of the polyether‐polyol hyperbranched poly(ethylene glycol) (__hb__PEG) as core and poly(L‐lactide) (PLLA) arms are synthesized via the organobase‐ catalyzed ring‐opening polymerization of lactide using __hb__PEG as a multifunctional macroinitiator. Star copolymers with high molecular weights up to 792 000 g mol^−1^ are prepared. Detailed 2D NMR analysis provides evidence for the attachment of the PLLA arms to the core and reveals that the adjustment of the monomer/initiator ratio enables control of the arm length. Size exclusion chromatography measurements show narrow molecular weight distributions. Thermal analysis reveals a lower glass transition temperature, melting point, and degree of crystallization for the star‐shaped polylactides compared to linear polylactide.

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✍ Feng Qiu; Chunlai Tu; Yan Chen; Yunfeng Shi; Liang Song; Ruibing Wang; Prof. Xin 📂 Article 📅 2010 🏛 John Wiley and Sons 🌐 English ⚖ 445 KB 👁 2 views

## Abstract A self‐assembly approach to tuning the optical properties of a star copolymer is reported herein. The star copolymer HCP‐__star__‐PEG with a hyperbranched conjugated polymer (HCP) core and many linear poly(ethylene glycol) (PEG) arms has been prepared successfully. The HCP core was synt