Journal of Sol-Gel Science and Technology

, Volume 64, Issue 3, pp 549–556 | Cite as

Application of lateral sol–gel type crosslinking to a polyurethane copolymer

  • Yong-Chan Chung
  • Nguyen Duy Khiem
  • Jae Won Choi
  • Byoung Chul Chun
Original Paper


A triethoxysilyl (TES) group was attached to polyurethane (PU) as a side group through allophanate bonding. The PUs were crosslinked by a sol–gel reaction between the triethoxysilyl groups after acidic hydrolysis, and the tensile strength and shape memory properties were tested for a series of PUs with a different TES group contents. The tensile stress suddenly increased at a critical TES content level, and the tensile strain was rather increased with increasing stress. The shape recovery at 45 °C remained above 90 % for the entire range of TES group contents. The low temperature flexibility of the TES crosslinked PUs was better than that of the linear PU without crosslinking. The extraordinary characteristics of the sol–gel crosslinked PUs are discussed.


Side group Crosslinking Sol–gel Shape memory 



This research was supported by the Basic Science Research Program through the National Research Foundation (NRF) funded by the Ministry of Education, Science, and Technology (R11-2005-065).


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Copyright information

© Springer Science+Business Media New York 2012

Authors and Affiliations

  • Yong-Chan Chung
    • 1
  • Nguyen Duy Khiem
    • 2
  • Jae Won Choi
    • 3
  • Byoung Chul Chun
    • 3
  1. 1.Department of ChemistryThe University of SuwonHwasungKorea
  2. 2.Department of Polymer EngineeringThe University of SuwonHwasungKorea
  3. 3.School of Nano Engineering, Institute of Basic Science, Center for Nano ManufacturingInje UniversityGimhaeKorea

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