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    Synthesis and rheology of thermoreversible polyurethane hydrogels

    Year: 2012

    Journal: Central European journal of chemistry, 2012, 10 (6) pp 1859-1866, 20130115

    Authors: Luiza M. Gradinaru, Constantin Ciobanu, Stelian Vlad, Maria Bercea, Marcel Popa

    Organizations: Petru Poni Institute of macromolecular chemistry, 700487 lasi, Romania, "Gh. Asachi" Technical university, Faculty of Chemical engineering and environmental protection, 700050 lasi, Romania

    Polyurethanes based on poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) triblock copolymer, succinic or citric acid, and ethyl ester L-lysine diisocyanate were synthesized and characterized by FT-IR and GPC. Wetting properties were evaluated by contact angle determinations. The critical micelle concentration was determined from surface tension measurements. Their abillity to undergo self-aggregation and temperature induced gelation was investigated through dynamic oscillatory measurements. The gelation point, sol-gel transitions, and gel structure are influenced by polymer structure, composition, molecular weight, concentration, and heating rate.