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Polyurethane foam/silica chemical hybrids for shape memory effects

Published online by Cambridge University Press:  23 October 2012

S.M. Kang ,
M.J. Kim ,
S.H. Kwon ,
H. Park ,
H.M. Jeong  and
B.K. Kim
S.M. Kang
Affiliation:
Department of Polymer Science and Engineering, Pusan National University, Busan 609-735, Korea
M.J. Kim
Affiliation:
Department of Polymer Science and Engineering, Pusan National University, Busan 609-735, Korea
S.H. Kwon*
Affiliation:
Department of Naval Architecture and Ocean Engineering, Pusan National University, Busan 609-735, Korea
H. Park
Affiliation:
Global Core Research Center for Ships and Offshore Plants, Pusan National University, Busan 609-735, Korea
H.M. Jeong
Affiliation:
Department of Chemistry, University of Ulsan, Ulsan 680-749, Korea
B.K. Kim*
Affiliation:
Department of Polymer Science and Engineering, Pusan National University, Busan 609-735, Korea
*
a)Address all correspondence to these authors. e-mail: shkwon@pnu.edu
b)e-mail: bkkim@pnu.edu
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Abstract

The isocyanate-functionalized silica nanoparticles were chemically incorporated into the polyurethane (PU) during the synthesis of flexible PU foam from polypropylene glycol and toluene diisocyanate following the one-shot method with water as the blowing agent. Chemical incorporations of silica nanoparticles augmented hardness, initial modulus, and strength for tensile and compression loading. As results, shape fixity, shape recovery, and strain energy storage significantly increased with reduced hysteresis loss. It was found that the chemically incorporated silica particles effectively reinforce the PUs with improved dispersion and act as multifunctional cross-links, elastic energy storage, and relaxation retarder, which are beyond the conventional reinforcing filler. The maximum increases of dynamic properties and shape memory performances with 2% silica are an indication that the chemical incorporation is also limited by particle aggregations, though it appears at higher content than the simple blend.

Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 22 , 22 November 2012 , pp. 2837 - 2843
Copyright
Copyright © Materials Research Society 2012

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References

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