Positron annihilation lifetime studies of the volume phase transition of polyacrylamides |
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| Authors: | K Ito Y Ujihira T Yamashita K Horie |
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| Institution: | (1) Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, 153 Tokyo, (Japan);(2) Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, 113 Tokyo, (Japan) |
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| Abstract: | Discontinuous and continuous volume phase transitions of organic polymer hydrogels, such as polyacrylamide (PAAm) and poly(N-isopropylamide) (PNIPA) gels, uponpH and temperature were studied by the positron annihilation lifetime measurement, which allows the estimation of size, intensity and size distribution of the free volume. Microscopic changes of physical and chemical interactions between gel network and solvent molecules and among conjugated solvent molecules at volume phase transitions of polyacrylamide gels were discussed. |
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