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Influence of Molar Mass and Concentration on the Thermogelation of Methylcelluloses |
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| Authors: | Pauline L Nasatto Frédéric Pignon Joana L M Silveira Maria Eugênia R Duarte Miguel D Noseda Marguerite Rinaudo |
| Institution: | 1. Department of Biochemistry and Molecular Biology, Federal University of Paraná, Curitiba, Paraná, Brazil;2. Laboratoire Rhéologie et Procédés, University Grenoble Alpes, Grenoble, France;3. Laboratoire Rhéologie et Procédés, University Grenoble Alpes, Grenoble, France;4. Laboratoire Rhéologie et Procédés, National Centre for Scientific Research (CNRS), Grenoble, France;5. Biomaterials Applications, Grenoble, France |
| Abstract: | In this study, thermogelation of methylcelluloses is investigated in relation to the molar mass and concentration in aqueous medium. A large hysteresis between heating and cooling ramps was observed whatever the conditions. The heating process in particular was studied to analyze the two steps of gelation using rheometry. At low temperature, in the sol state, viscosity depends on the concentration and molar mass. Over 30°C a gel-like behavior was observed including two steps (the second step is a strong gel with phase separation) having storage moduli that are nearly independent of polymer molar mass but are directly related to polymer concentration. |
| Keywords: | Methylcellulose Methylcellulose concentration Methylcellulose molar mass Thermogelation |