Thermo-responsive Ionogels with Tunable Positive Volume Phase Transition Temperature
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초록
내용
Polymer gels are formed from three-dimensional network which host certain types of solvent and bear the combined properties of the polymer and solvent. Here, we prepared gels with ionic liquids (ionogels) which has a reversed behavior compared to its hydrogels system, poly(N-isopropylacrylamide) (PNIPAm) ionogels show a positive volume phase transition upon heating which swell and increasing its dimension. However, the limitation of PNIPAm ionogels in real-life application is its high volume phase transition temperature (VPTT). We managed to tune down the high VPTT by altering ionogel structure with solvatophilic comonomer, widening its application to be used in milder temperature. We observed other different properties of the ionogels such as drastic volume transition, greater swelling ratio and swelling-deswelling kinetics. We further improved the mechanical properties of ionogels by enforcement with additional network to realize tougher and more stretchable ionogels.