Photocurable biodegradable poly(ɛ-caprolactone)/poly(ethylene glycol) multiblock copolymers showing shape-memory properties |
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Authors: | Minoru Nagata Iyo Kitazima |
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Institution: | (1) Department of Environmental Information, Faculty of Human Environment, Kyoto Prefectural University, Shimogamo, Sakyoku, Kyoto 606-8522, Japan |
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Abstract: | Biodegradable multiblock copolymers were synthesized by a polycondensation of poly(ɛ-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 °C for 2 h, and were characterized by GPC, 1H-NMR, FTIR, UV, DSC, and WAXS. These photosensitive copolymers were irradiated by a 400-W high-pressure mercury lamp (λ>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 °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%. |
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Keywords: | Multiblock biodegradable copolymers Poly(ɛ -caprolactone) Poly(ethylene glycol) Photocrosslinking Shape-memory property |
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