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Photocurable Shape-Memory Copolymers of ε-Caprolactone and L-Lactide

✍ Scribed by Minoru Nagata; Yu Yamamoto

Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
494 KB
Volume
211
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Biodegradable and photocurable block copolymers of ε‐caprolactone and L‐lactide were synthesized by polycondensation of PLLA diol ($\overline {M} _{{\rm n}} $ = 10 000 g · mol^−1^), PCL diol ($\overline {M} _{{\rm n}} $ = 10 000 g · mol^−1^), and a chain extender bearing a coumarin group. The effect of copolymer composition on the thermal and mechanical properties of the photocured copolymers was studied by means of DSC and cyclic tensile tests. An increase in Young's modulus and a decrease in the tensile strain with increasing PLLA content was observed for the block copolymers. Block copolymers with high PCL content showed good to excellent shape‐memory properties. Random copolymers exhibited R~f~ and R~r~ values above 90% at 45 °C for an extremely large tensile strain of 1 000%.

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