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Issue 17, 2010
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Organic–inorganic chemical hybrids having shape memory effect

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Vinyltrimethoxysilane (VTMS)-modified silica particles were incorporated into the chain of amorphous polyurethane (PU) by covalent bonds, to synthesize an organic–inorganic hybrid material with an extremely long relaxation time. At 1% silica, the PUsilica chemical hybrids gave over 99% shape fixity and shape recovery with <2% hysteresis during the four thermomechanical cycles. As silica content increases (2, 3%) shape memory performance slightly decreased with repeated cycles. Results were favorably compared with PUs cross-linked by hydroxyl ethylacrylate (HEA) and VTMS, and physical blends with silica particles. The results were interpreted based on the triple effects of silica particles as multifunctional cross-linkers, reinforcing fillers, and relaxation retarders of the polymer chains during loading and unloading.

Graphical abstract: Organic–inorganic chemical hybrids having shape memory effect

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The article was received on 03 Nov 2009, accepted on 14 Jan 2010 and first published on 19 Feb 2010

Article type: Paper
DOI: 10.1039/B922775J
J. Mater. Chem., 2010,20, 3458-3466

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    Organic–inorganic chemical hybrids having shape memory effect

    D. H. Jung, H. M. Jeong and B. K. Kim, J. Mater. Chem., 2010, 20, 3458
    DOI: 10.1039/B922775J

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