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S. Kelch, N.-Y. Choi, Z. Wang and A. Lendlein Amorphous, Elastic AB Copolymer Networks from Acrylates and Poly[(L-lactide)-ran-glycolide]dimethacrylates Advanced Engineering Materials 10

Article first published online: 14 MAY 2008 | DOI: 10.1002/adem.200700339

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Three series of amorphous AB copolymer networks with shape-memory capabilities were obtained from poly[(L-lactide)-ran-glycolide]dimethacrylate (DM) as crosslinker and ethylacrylate-(AEt), butylacrylate-(ABu), or hexyl acrylate (AHe) as comonomers. The switching temperature Tsw of the shape-memory effect could be adjusted between 9 °C to 45 °C. Strain fixity rates and strain recovery rates above 96 % could be reached. Compared to the homonetwork from DM, the incorporation of polyacrylate segments into the network led to a significant improvement of mechanical properties. Reaching higher elasticity and the possibility to adjust Tsw to a temperature between room temperature and body temperature are considered to be substantial steps to improve the applicability of these polymer networks.

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