Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/7782
Title: Effect of cationic group content on shape memory effect in segmented polyurethane cationomer
Authors: Zhu, Y
Hu, J 
Yeung, KW
Choi, KF
Liu, Y
Liem, H
Keywords: Cationomer
Cyclic tensile test
Polyurethane
Shape memory effect
Issue Date: 2007
Publisher: John Wiley & Sons
Source: Journal of applied polymer science, 2007, v. 103, no. 1, p. 545-556 How to cite?
Journal: Journal of applied polymer science 
Abstract: To illustrate the importance of cationic groups within hard segments on shape memory effect in segmented polyurethane (PU) cationomers, the shape memory polyurethane (SMPU) cationomers composed of poly(ε-caprolactone) (PCL), 4,4′-diphenylmethane diisocyanate (MDI), 1,4-butanediol (BDO), and N-methyldiethanolamine (NMDA) or N,N-bis(2-hydroxyethyl)isonicotinamide (BIN) were synthesized. The comparison of shape memory effect between NMDA series and BIN series was made. The relations between the structure and shape memory effect of the two series of cationomers with various ionic group contents were investigated. It is observed that the stress at 100% elongation is reduced for these two series of PU cationomers with increasing ionic group content. Especially for NMDA series, the stress reduction is more significant. The fixity ratio and recovery ratio of the NMDA series can be improved simultaneously by the insertion of cationic groups within hard segments, but not for the BIN series. Characterizations with DSC and DMA suggest that the crystallibility of soft segment in SMPU cationomers was enhanced by incorporation of ionic groups into hard segments, leading to a relative high degree of soft segment crystallization; compared with the corresponding nonionomers, incorporation of charged ionic groups within hard segments can enhance the cohesion force among hard segments particularly at high ionic group content. This methodology offers good control of the shape memory characteristic in thin films and is believed to be beneficial to the shape memory textile industries.
URI: http://hdl.handle.net/10397/7782
ISSN: 0021-8995
EISSN: 1097-4628
DOI: 10.1002/app.24820
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