Shape-memory behaviors of biodegradable poly(L-lactide-co-Ε- caprolactone) copolymers

被引：0
|
作者：
Lu, X.L. [1 ]
Cai, W. [2 ]
Gao, Z.Y. [2 ]
机构：
[1] Center for Biomedical Materials and Engineering, Harbin Engineering University, Harbin 150001, China
[2] School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
来源：
Journal of Applied Polymer Science | 2008年 / 108卷 / 02期
关键词：
A series of biodegradable poly(L-lactide-co-Ε-caprolactone) (PCLA) copolymers with different chemical compositions are synthesized and characterized. The mechanical properties and shape-memory behaviors of PCLA copolymers are studied. The mechanical properties are significantly affected by the copolymer compositions. With the Ε-caprolactone (Ε-CL) content increasing; the tensile strength of copolymers decreases linearly and the elongation at break increases gradually. By means of adjusting the compositions; the copolymers exhibit excellent shape-memory effects with shape-recovery and shape-retention rate exceeding 95%. The effects of composition; deformation strain; and the stretching conditions on the recovery stress are also investigated systematically. A maximum recovery stress around 6.2 MPa can be obtained at stretching at Tg - 15°C to 200% deformation strain for the PCLA70 copolymer. The degradation results show that the copolymers with higher Ε-CL content have faster degradation rates and shape-recovery rates; meanwhile; the recovery stress can maintain a relative high value after 30 days in vitro degradation. © 2008 Wiley Periodicals; Inc;
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页码：1109 / 1115
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