Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/12387
Title: Shape memory effect of PU ionomers with ionic groups on hard-segments
Authors: Zhu, Y
Hu, JL 
Yeung, KW
Fan, HJ
Liu, YQ
Keywords: Cyclic tensile test
Cyclic thermo-mechanical investigations
Ionomers
Polyurethane
Shape memory effect
Strain recovery test
Issue Date: 2006
Source: Chinese journal of polymer science (english edition), 2006, v. 24, no. 2, p. 173-186 How to cite?
Journal: Chinese Journal of Polymer Science (English Edition) 
Abstract: SMPU (shape memory polyurethane) non-ionomers and ionomers, synthesized with poly(ε-caprolactone) (PCL), 4, 4′-diphenylmethane diisocyanate (MDI), 1,4-butanediol (BDO), dimethylolpropionic acid (DMPA) were measured with cyclic tensile test and strain recovery test. The relations between the structure and shape memory effect of these two series were studied with respect to the ionic group content and the effect of neutralization. The resulting data indicate that, with the introduction of asymmetrical extender, the stress at 100% elongation is decreased for PU non-ionomer and ionomer series, especially lowered sharply for non-ionomer series; the fixation ratio of ionomer series is not affected obviously by the ionic group content; the total recovery ratio of ionomer series is decreased greatly. After sufficient relaxation time for samples stretched beforehand, the switching temperature is raised slightly, whereas the recovery ratio measured with strain recovery test method is lowered with increased DMPA content. The characterization with FT-IR, DSC, DMA elucidated that, the ordered hard domain of the two series is disrupted with the introduction of DMPA which causes more hard segments to dissolve in soft phase; ionic groups on hard segment enhance the cohesion between hard segments especially at high ionic group content and significantly facilitate the phase separation compared with the corresponding non-ionomer at moderate ionic group content.
URI: http://hdl.handle.net/10397/12387
ISSN: 0256-7679
DOI: 10.1142/S0256767906001187
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

SCOPUSTM   
Citations

34
Last Week
0
Last month
0
Citations as of Jun 19, 2017

WEB OF SCIENCETM
Citations

34
Last Week
0
Last month
0
Citations as of Jun 23, 2017

Page view(s)

33
Last Week
3
Last month
Checked on Jun 25, 2017

Google ScholarTM

Check

Altmetric



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.