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1 April 2015 The effect of cross linker concentration in the physical properties of shape memory gel
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The shape memory hydrogels were synthesized and studied the physical properties. The gels were made by a hydrophilic monomer named N, N-dimethyl acrylamide (DMAAm) and a hydrophobic monomer named stearyl acrylate (SA). The water-swollen hydrogels show well transparency and shape memory property while gels absorb large water content. The properties were characterized by varying the cross-link concentration, whereas the concentration of other chemical components was remained constant. In this study, the DMAAm and the SA ratio was 3:1 to make one mole solution. It is observed that the swelling ratio slightly depends on the cross-link concentration at certain amount. However, mechanical properties strongly depend on the cross-link concentration. Thermal properties were investigated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). DSC spactra of dried samples exhibits complex crystalline nature, while swollen samples show homogeneous crystallinity. A well thermal stability is observed regard less of cross-link concentration.
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M. Hasnat Kabir, Kumkum Ahmed, Jin Gong, and Hidemitsu Furukawa "The effect of cross linker concentration in the physical properties of shape memory gel", Proc. SPIE 9432, Behavior and Mechanics of Multifunctional Materials and Composites 2015, 94320Q (1 April 2015);

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