Abstract
3-Triethoxysilylpropyl isocyanate was used to graft a triethoxysilyl group to polyurethane (PU), and the grafted triethoxysilyl groups were used to cross-link PU chains through a sol–gel process. The soft segment melting temperature and enthalpy change were not significantly altered by the sol–gel cross-linking. The sol–gel cross-linked PUs exhibited significantly increased tensile strength and better tensile strain compared to the plain linear PU: the maximum stress and strain increased to 41 MPa and 1,972 %, respectively. Control series containing tetraethyl orthosilicate, a series without cross-linking, was also prepared for comparison with the sol–gel cross-linked PU series. The control series did not exhibit the increased tensile strength shown by the sol–gel cross-linked PU series. The cyclic shape memory tests demonstrated that the shape recovery was as high as 97 %, and both shape recovery and shape retention remained high after the four repeated tests. The sol–gel cross-linked PU series exhibited enhanced low-temperature flexibility compared to the plain linear PU due to the flexible silyl cross-linking group.
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Acknowledgments
This study was supported by the R&D Center for Valuable Recycling (Global-Top Environmental Technology Development Program) funded by the Ministry of Environment (Project No.: 2014001190001).
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Chung, YC., Kang, K.S. & Chun, B.C. Lateral sol–gel cross-linking of polyurethane using the a grafted triethoxysilyl group. J Sol-Gel Sci Technol 72, 543–552 (2014). https://doi.org/10.1007/s10971-014-3471-9
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DOI: https://doi.org/10.1007/s10971-014-3471-9