Because of a large difference in storage modulus below and above the glass transition temperature, poly(acrylic acid- co -methyl methacrylate)/poly(ethylene glycol) (P(AA- co -MMA)/PEG) complexes show shape memory properties with a recovery ratio of nearly reach 99%. Before the shape memory testing, it was necessary to determine the conformational changes of the P(AA- co -MMA) gel induced by complexation with linear PEG. It was found that both the concentration and molecular weight of PEG have a strong effect on the complexation with P(AA- co -MMA) gel. In such a system the minimum molecular weight of PEG required for the complex formation lowers to 1000.
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Liu et al. (2004) studied this question.
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