Synthesis and rheology of thermoreversible polyurethane hydrogels

Luiza Gradinaru, Constantin Ciobanu 1 , Stelian Vlad 1 , Maria Bercea 1 , and Marcel Popa 2
  • 1 ”Petru Poni” Institute of Macromolecular Chemistry, 700487, Iasi, Romania
  • 2 Faculty of Chemical Engineering and Environmental Protection, ”Gh. Asachi” Technical University, 700050, Iasi, Romania

Abstract

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.

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