Issue 7, 2007
From the journal:

Soft Matter

Degradable shape-memory polymer networks from oligo[(l-lactide)-ran-glycolide]dimethacrylates

Nok-young Choia  and  Andreas Lendlein*bc  

* Corresponding authors

a BASF AG, Sales Engineering Plastics, 67056 Ludwigshafen, Germany

b Center for Biomaterial Development, Institute of Polymer Research, GKSS Research Center Geesthacht GmbH, Kantstr. 55, 14513 Teltow, Germany
E-mail: andreas.lendlein@gkss.de

c Berlin-Brandenburg Center for Regenerative Therapies, Charité - Universitätsmedizin Berlin, Campus Virchow-Klinikum, Augustenburger Platz 1, 13353 Berlin, Germany

Abstract

In this paper degradable shape-memory polymer networks synthesized from oligo[(L-lactide)-ran-glycolide]dimethaycrylates are introduced. The macrodimethacrylates are prepared via a two-step synthesis: hydroxy telechelic oligo[(L-lactide)-ran-glycolide]s with number average molecular weights Mn ranging from 1000 to 5700 g mol−1 were synthesized by ring-opening polymerization from L,L-dilactide, diglycolide and ethylene glycol as initiator using dibutyltin oxide as the catalyst. These oligodiols are reacted with methacryloyl chloride resulting in terminal methacrylate groups. Crosslinking of macrodimethacrylates is performed under exposure to UV light without applying a photo initiator. The polymer networks obtained are transparent and hydrolytically degradable. While the mechanical properties at temperatures higher than Tg depend on crosslinking density, Tg is almost constant at about 55 °C. The shape-memory functionality of the amorphous polymer network was investigated by cyclic, thermomechanical tests under the systematic variation of different programming parameters. Good shape-memory properties with strain recovery rates close to 100% were obtained under stress-controlled programming. Under strain-controlled conditions, it needs to be considered that relatively high stresses can be generated during programming. Potential biomedical applications are intelligent implants or smart drug release systems.

Graphical abstract: Degradable shape-memory polymer networks from oligo[(l-lactide)-ran-glycolide]dimethacrylates

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Article information

DOI
https://doi.org/10.1039/B702515G
Article type
Paper
Submitted
16 Feb 2007
Accepted
23 Apr 2007
First published
14 May 2007

Soft Matter, 2007,3, 901-909

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Degradable shape-memory polymer networks from oligo[(L-lactide)-ran-glycolide]dimethacrylates

N. Choi and A. Lendlein, Soft Matter, 2007, 3, 901 DOI: 10.1039/B702515G

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