The Scientific World Journal / 2014 / Article / Fig 4

Research Article

Phase Diagrams of Smart Copolymers Poly(N-isopropylacrylamide) and Poly(sodium acrylate)

Figure 4

((a), (b)) TM-DSC thermogram of gel/water system in equilibrium swelling degree: (a) PNIPA/water (10%/90%) and (b) PNIPA-SA (40%/60%). Onset values of LCST were taken from the TM-DSC plots (reversing heat flow) upon first and second heating at 5°C/min. Cooling was performed with 10 K/min by standard DSC. Endotherms around 0°C on heating and exotherms around −30°C on cooling are related to melting and crystallization of water, respectively. (c) Experimental, reversing heat capacity of the 10%/90% PNIPA/water and their vibrational baseline, (vibrational) [44, 45].

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