Thermal analysis of water in reinforced plasma-polymerised poly(2-hydroxyethyl acrylate) hydrogels

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[1] Aroca, A. Serrano
[2] 2,Pradas, M. Monleón
[3] 2,Ribelles, J.L. Gómez
[4] Rault, J.
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Aroca, A. Serrano (angel.serrano@ucv.es) | 1600年 / Elsevier Ltd卷 / 72期
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Thermal analysis of water in reinforce hydrogels of plasma-polymerised poly(2-hydroxyethyl acrylate) (plPHEA) grafted onto macroporous poly(methyl methacrylate) (PMMA) are explained in a simple thermodynamic framework based on the transition diagram. Water in bulk PHEA was also analysed for comparison with plPHEA. These two hydrophilic polymers were prepared with a broad range of water mass fractions from 0.05 to 0.72. Thermal transition diagrams of water/PHEA and water/plPHEA were determined showing less undercooling of water crystallisation in plPHEA than in PHEA. Kinetics of water crystallisation for high and low water contents were studied in both hydrophilic systems following several thermal treatments. Water crystallises much faster in plPHEA than in PHEA for high water contents. For low water contents; crystallisation becomes possible holding at -30°C for some time due to water segregation in both PHEA systems. However; much less water is segregated from the water/plPHEA mixture due to the influence of the hydrophobic component. © 2015 Elsevier Ltd;
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