Synthesis and rheology of thermoreversible polyurethane hydrogels |
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| Authors: | Luiza M. Gradinaru Constantin Ciobanu Stelian Vlad Maria Bercea Marcel Popa |
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| Affiliation: | 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
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| 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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