Please use this identifier to cite or link to this item: https://doi.org/10.1021/ma802437f
Title: Synthesis and characterization of three-arm poly(fi-caprolactone)-based poly(ester urethanes) with shape-memory effect at body temperature
Authors: Xue, L.
Dai, S. 
Li, Z. 
Issue Date: 24-Feb-2009
Source: Xue, L., Dai, S., Li, Z. (2009-02-24). Synthesis and characterization of three-arm poly(fi-caprolactone)-based poly(ester urethanes) with shape-memory effect at body temperature. Macromolecules 42 (4) : 964-972. ScholarBank@NUS Repository. https://doi.org/10.1021/ma802437f
Abstract: Novel biodegradable star poly(ester urethanes) containing three-arm poly(fi-caprolactone) (PCL) as switching segment were prepared as shape-memory polymers (SMPs) with switching temperature (Ts) around body temperature. PCL-triols with molecular weight (Mn) of 2700 4200 g/mol and Tm of 45 47 °C were synthesized in 55 67% yield by Novozym 435-catalyzed ring-opening polymerization of fi-caprolactone with glycerol as initiator, and their three-arm structures were confirmed by 1 H and 13 C NMR analysis. Reaction of the PCL-triols with methylene diphenyl 4,4fi-diisocyanate isocynate and 1,6-hexanediol gave three-arm PCL-based poly(ester urethane)s (tPCL-PUs) in 83 92% yield, with 65 75% soft segment. The structure of tPCL-Pus was confirmed by 1 H NMR analysis, and the thermal properties were analyzed by DSC with Ts of 36 39 °C. tPCL-PUs showed excellent shape-memory effects at 38 °C during cyclic thermomechanical tensile tests: shape recovery within 10 s, shape fixity rate of 92%, and shape recovery rate of 99%. The novel biodegradable star SMPs are potentially useful in biomedical applications. © 2009 American Chemical Society.
Source Title: Macromolecules
URI: http://scholarbank.nus.edu.sg/handle/10635/64662
ISSN: 00249297
DOI: 10.1021/ma802437f
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