Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/30799
Title: Shape memory effect and reversible phase crystallization process in SMPU ionomer
Authors: Zhu, Y
Hu, J 
Choi, KF
Meng, Q
Chen, S
Yeung, KW
Keywords: Crystal growth
Ionomer
Isothermal crystallization
Polymers
Shape memory materials
Shape memory polyurethane
Issue Date: 2008
Publisher: John Wiley & Sons Ltd
Source: Polymers for advanced technologies, 2008, v. 19, no. 4, p. 328-333 How to cite?
Journal: Polymers for Advanced Technologies 
Abstract: It is the first attempt to reveal the effect of reversible phase crystallization process on shape memory effect in shape memory polyurethane (PU) ionomer. Thereof the cyclic tensile testing was conducted with various cooling time to fix the temporary deformation for assessing shape memory function. The crystallization process of the reversible phase, poly (ε-caprolactone) (PCL) in shape memory PU ionomers composed of different ionic group contents, 1,4-butanediol, 4,4′-methylenebis(phenyl isocyanate) and PCL, was investigated by using isothermal crystallization kinetics under the thermal routine similar to that for the cyclic tensile testing. The results demonstrate that the ionic groups within hard segments significantly slow down the crystal growth of the reversible phase. When the physical crosslink is strong enough, the crystallization rate would be a predominant factor determining the shape fixity ratio after various cooling time. Instead, when physical crosslink is weakening, the influence of crystallization rate is much less on the cooling time dependence of fixity.
URI: http://hdl.handle.net/10397/30799
DOI: 10.1002/pat.1001
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