Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/25532
Title: Influence of heat treatment on the properties of shape memory fibers. I. crystallinity, hydrogen bonding, and shape memory effect
Authors: Meng, Q
Hu, J 
Keywords: Polyurethanes
Stimuli-sensitive polymers
Issue Date: 2008
Publisher: John Wiley & Sons
Source: Journal of applied polymer science, 2008, v. 109, no. 4, p. 2616-2623 How to cite?
Journal: Journal of applied polymer science 
Abstract: Shape memory fibers (SMFs) were prepared via melt spinning. The fibers underwent different heat treatments to eliminate internal stress and structure deficiency caused during melt spinning. The influences of heat treatments on the SMF crystallinity, molecular orientation, hydrogen bonding, and shape memory behavior were studied. It was found with increasing heat-treatment temperature, the soft segment crystallinity, crystallite dimension, and microphase separation increased, and the hydrogen bonding in the hard segment phase increased. Low temperature heat treatments decreased the shape recovery ratios while increasing the shape fixity ratios as a result of internal stress releasing and molecules disorientation. High temperature heat treatments increased the hard segment stability. Increasing heat-treatment temperature resulted in the improvement of both the shape recovery and fixity, because it promoted the phase separation. The results from DSC, DMA, XRD, and FTIR were used to illustrate the mechanism governing these properties difference.
URI: http://hdl.handle.net/10397/25532
ISSN: 0021-8995
EISSN: 1097-4628
DOI: 10.1002/app.28363
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