Photocurable biodegradable poly(ε-caprolactone)/poly(ethylene glycol) multiblock copolymers showing shape-memory properties

被引:36
作者
Nagata, M [1 ]
Kitazima, I [1 ]
机构
[1] Kyoto Prefectural Univ, Fac Human Environm, Dept Environm Informat, Sakyo Ku, Kyoto 6068522, Japan
关键词
multiblock biodegradable copolymers; poly(epsilon-caprolactone); poly(ethylene glycol); photocrosslinking; shape-memory property;
D O I
10.1007/s00396-005-1393-3
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Biodegradable multiblock copolymers were synthesized by a polycondensation of poly(epsilon-caprolactone) (PCL) diols of molecular weight (MW)=3,000 and poly(ethylene glycol)s (PEG) of MW=3,000 with 4,4'-(adipoyldioxy)dicinnamic acid (CAC) dichloride as a chain extender in diphenyl ether at 180 degrees C for 2 h, and were characterized by GPC, H-1-NMR, FTIR, UV, DSC, and WAXS. These photosensitive copolymers were irradiated by a 400-W high-pressure mercury lamp (lambda>280 nm) from 5-60 min to form a network structure. The gel contents increased with irradiation time, and attained ca. 90% after 60 min for all copolymers. The degree of swelling in a distilled water at ambient temperature, and the rate of degradation in a phosphate buffer solution (pH 7.2) at 37 degrees C increased with increasing PEG components. The shape-memory tests were performed by a cyclic thermomechanical experiments for the photocured CAC/PCL/PEG (75/25) films. The film with a gel content of 57% showed the best shape-memory property with strain fixity rate of 100% and strain recovery rate of 88%.
引用
收藏
页码:380 / 386
页数:7
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