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Figure 5a and b shows the evolution of the storage modulus with temperature for PAMGA hydrogels prepared from different monomer and initiator concentrations.
The transition occurring at high temperatures implies an increase in the elastic modulus of the PAMGA gels due to an increasing compactness of the gel structure and it is probably related to a volume phase transition.
To demonstrate that hydrophobic interactions, rather than chemical or permanent modifications, were responsible for the transition in PAMGA gels, a study of the thermoreversibility of the transition was performed.
Figure 6 shows three consecutive temperature scans between 10 and 100[degrees]C for a PAMGA hydrogel: heating from 10 to 100 [degrees] C, cooling from 100 to 10 [degrees] C, and reheating from 10 to 100[degrees]C.