Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/25203
Title: Influence of ionic groups on the crystallization and melting behavior of segmented polyurethane ionomers
Authors: Zhu, Y
Hu, JL 
Yeung, KW
Liu, YQ
Liem, HM
Keywords: Ionomers
Isothermal crystallization
Melting behavior
Phase separation
Polyurethanes
Issue Date: 2006
Publisher: John Wiley & Sons Inc
Source: Journal of applied polymer science, 2006, v. 100, no. 6, p. 4603-4613 How to cite?
Journal: Journal of Applied Polymer Science 
Abstract: The isothermal crystallization kinetics and melting behavior of the soft segment in polyurethane (PU) ionomer/nonionomer based on PCL-4000 (poly(ε-caprolactone)) were investigated using polarizing optical microscopy (POM) and differential scanning calorimetry (DSC). In general, the presence of ionic groups in PU ionomers can promote the formation of a more stable crystalline structure and lower the equilibrium melting temperature of the crystallizable phase. Comparison between the crystallization characteristics of PU nonionomers and ionomers suggests that the Coulombic Forces between ionic groups within hard segment can increase the crystallization rate and decrease the crystal size of soft segment when the total molecular weight (M w of PU ionomer is higher than -71,000. On the other hand, the opposite effect of ionic groups on the crystallization rate is observed in PU ionomers with M w below ∼20,000. The DSC thermograms illustrate that the ionic groups can significantly enhance the microphase separation in PU ionomers with higher M w values. By the control and manipulation of crystallization and microstructure formation in PU ionomer, it is possible to achieve shape memory PUs with superior physical property.
URI: http://hdl.handle.net/10397/25203
ISSN: 0021-8995
DOI: 10.1002/app.23009
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