Fig. 7

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DSC curves and temperature resistance of HPAM/Al3+ gel samples under the different salinities. (a) DSC curve of HPAM/Al3+ system 1; (b) DSC curve of HPAM/Al3+ system 2; (c) DSC curve of HPAM/Al3+ system 3; (d) Temperature resistance of HPAM/Al3+ systems.