Relationship between Annealing and Shape Memory Effect of Shape Memory Polyurethane

Jia Ying; Masaaki Nishikawa; Masaki Hojo

doi:10.4028/www.scientific.net/AMR.936.140

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 936Relationship between Annealing and Shape Memory...

Relationship between Annealing and Shape Memory Effect of Shape Memory Polyurethane

Abstract:

The relationship of annealing and shape memory effect of uniaxially oriented shape memory polyurethane was studied; meanwhile a new method of adjusting shape recovery ratio by annealing was proposed for further consideration. Experiments were designed to compare the influence on length change from annealing and shape memory effect with shape memory polyurethane film at 65°C. We found that for shape memory polyurethane which had residual strain from material processing procedure, annealing and shape memory effect have the same effect on its length change if they are both carried out at the same temperature. It is because annealing and shape memory effect have the same mechanism, which is the change of state from low conformational entropy states to the recovery of a stable high entropy state in the polymer. Moreover, it is proved by experiment that shape recovery ratio of shape memory polyurethane can be adjusted by annealing.

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Periodical:

Advanced Materials Research (Volume 936)

Pages:

140-144

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.936.140

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Online since:

June 2014

Authors:

Jia Ying*, Masaaki Nishikawa, Masaki Hojo

Keywords:

Annealing, Shape Memory Effects (SME), Shape Memory Polyurethane

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