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Synthesis and characterization of poly(carbonate urethane) networks with shape‐memory properties
Author(s) -
Feng Yakai,
Xue Yan,
Guo Jintang,
Cheng Lei,
Jiao Licai,
Zhang Yu,
Yue Jinlong
Publication year - 2009
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.29426
Subject(s) - isophorone diisocyanate , polyurethane , differential scanning calorimetry , thermogravimetric analysis , fourier transform infrared spectroscopy , polycarbonate , materials science , glass transition , polymer chemistry , dynamic mechanical analysis , diol , chemical engineering , polymer , composite material , physics , engineering , thermodynamics
In this study, a series of shape‐memory polyurethanes were prepared from polycarbonate diol (PCDL) with a molecular weight of 2000, trimethylol propane, and isophorone diisocyanate (IPDI). The properties of crosslinked poly(carbonate urethane) (PCU) networks with various compositions were investigated. The chemical structures and thermal properties were determined with Fourier transform infrared (FTIR) spectroscopy, differential scanning calorimetry, and thermogravimetric analysis. FTIR analysis indicated that PCU had the structures of IPDI and PCDL and the amido formyl ester in polyurethanes. The gel content of PCU showed that PCU could be effectively formed as crosslinked polyurethane networks. The glass‐transition temperatures of the PCU networks increased slightly with decreasing soft‐segment content in the networks. The values of Young's modulus in the networks at 25°C increased with decreasing soft‐segment content, whereas the tensile stress and breaking elongation decreased significantly. PCU showed shape‐memory effects with a high strain fixity rate. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009