Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 34, Issue 2, Pages 180-184Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.201200594
Keywords
elastomers; natural rubber; shape memory; stimuli-sensitive polymers; stress-induced stabilizing
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Funding
- NRW Forschungsschule Forschung mit Synchrotronstrahlung in den Nano- und Biowissenschaften
- Ministry of Innovation, Science and Research of North Rhine-Westphalia in the frame of CLIB-Graduate Cluster Industrial Biotechnology
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In contrast to all known shape memory polymers, the melting temperature of crystals in shape memory natural rubber (SMNR) can be greatly manipulated by the application of external mechanical stress. As shown previously, stress perpendicular to the prior programming direction decreases the melting temperature by up to 40 K. In this study, we investigated the influence of mechanical stress parallel to prior stretching direction during programming on the stability of the elongation-stabilizing crystals. It was found that parallel stress stabilizes the crystals, which is indicated by linear increase of the trigger temperature by up to 17 K. The crystal melting temperature can be increased up to 126.5 degrees C under constrained conditions as shown by X-ray diffraction measurements.
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