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The temperature memory and multiple shape memory effect in temperature-driven and solvent-driven recovery

Rui Xiao's picture

http://pubs.rsc.org/en/content/articlelanding/2014/ra/c4ra11412d#!divAbstract

R. Xiao, J. Guo, T. D. Nguyen RSC Adv., 2015,5, 416-423

http://pubs.rsc.org/en/content/articlelanding/2015/sm/c5sm00543d#!divAbstract

R. Xiao, J. Guo, D. L. Safranski, T. D. Nguyen Soft Matter, 2015,11, 3977-3985

Amorphous polymers achieve shape memory behavior through the large change in the chain mobility above the glass transition.  Above the glass transition temperature, the polymer chains are mobile and can recover quickly to equilibrium when unloaded. Below the glass transition, the chains slow to recover when unloaded.  The temperature span of the glass transition has a direct effect on the shape memory behavior.  Materials with broad glass transition region can store and recover multiple shapes and remember not just the deformation but also the programming temperature.  Since the glass transition is the underlying mechanism of shape memory behavior in amorphous materials, shape recovery can be achieved by either increasing the temperature in the material above the glass transition temperature or by decreasing the glass transition temperature to below the temperature of the material. The latter can be achieved with the absorption of solvents. In recent works, we have demonstrated the temperature memory and multiple shape memory effect for both temperature and solvent driven shape recovery.  Specifically,we have shown the correspondence between solvent and temperature driven recovery phenomenon. For solvent-driven shape recovery, the programming temperature and solvent type both strongly influence on the shape recovery behavior.  Thus, the temperature memory effect can be used to program multiple shapes for multi-staged recovery in solvent.  Analogous to the temperature memory effect, different solvents can also induce different shape recovery  and can also provide a mechanism for multi-staged and multiple shape memory recovery in solvent.

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