Effect of solvent on aggregation structure and responsive properties of copolymeric gel with side chain crystals |
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| Institution: | 1. Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan;2. Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan;3. High Flux Isotope Reactor, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, United States;4. Department of Biomolecular Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo, Kyoto, 606-8585, Japan;1. Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA;2. Department of Polymer Engineering, The University of Akron, Akron, OH, 44325, USA;3. Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China;1. Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign, 382K, Agricultural Engineering and Sciences Building, 1304 W. Pennsylvania Ave., Urbana, IL 61801, USA;2. X-Ray Science Division, Argonne National Laboratory, 9700 S. Cass Avenue, Bldg. 401 MS-16, Argonne, IL 60439-4837, USA;1. Laboratory of Surface Science and Technology (LSST), Department of Materials, ETH, Vladimir-Prelog-Weg 5, 8093 Zürich, Switzerland;2. LNESS, Department of Physics, Politecnico di Milano, via Anzani 42, 22100 Como, Italy;3. INFN, Sezione di Milano, via Celoria 16, 20133 Milano, Italy;4. Institute of Radiation Physics, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstr. 400, 01328 Dresden, Germany;5. Department of Aerospace Science and Technology, Politecnico di Milano, via La Masa 34, 20156 Milano, Italy;6. Empa Materials Science and Technology, Laboratory for Biomimetic Membranes and Textiles, Lerchenfeldstrasse 5, 9014 St. Gallen, Switzerland |
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| Abstract: | The copolymeric gel films were prepared by a radical copolymerization of stearyl acrylate(SA), acrylic acid(AA) and N,N′-methylenebisacrylamide (MBAA) as a cross-linking agent. The copolymeric (molar ratio SA/AA/MBAA: 24.7/74.3/1.0) gel films with crystalline side chains were swollen in three different kinds of solvent and their aggregation structure and responsive properties have been investigated. In order to control the SA side chains-solvent interaction and to dissociate carboxyl groups in AA, solvents such as dimethyl sulfoxide (DMSO), (1-hexanol/DMSO) mixed solvents and water with different pH values were used. The responsive behaviors of the (SA/AA/MBAA) gel film swollen in different solvents were discussed on the basis of the weight swelling ratio. The X-ray diffraction study of the gel film revealed that the long period corresponding to a layer distance for the (SA/AA/MBAA) gel film swollen in DMSO increased with temperature or the swelling ratio, and the interchain distance of alkyl side chains remained constant with the variation of temperature up to the melting temperature of SA side chain crystals. The swelling ratio of the gel film in (1-hexanol/DMSO) mixed solvent exhibited an abrupt increase in the case of about 40wt% of 1-hexanol, because the SA side chain crystals of the gel film in the mixed solvents were dissolved due to an increase in SA-solvent interaction. On the other hand, the gel film in the water with different pH values showed a sharp increase in the swelling ratio above pH = 11, because the ionic repulsive force among the AA groups became greater than the aggregation one among alkyl side chains. These results indicate that the swelling ratio of the (SA/AA/MBAA) gel film can be controlled by temperature, pH and the magnitude of solubility parameter of swelling solvent. |
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