| Concentration fluctuations in polymer gel investigated by neutron scattering: Static inhomogeneity in swollen gel (2004) | |||||||||||
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| JOURNAL CHEMICAL PHYSICS VOLUME NUMBER DECEMBER Concentration uctuations polymer gel investigated neutron scattering Static inhomogeneity swollen gel Satoshi Koizumia ASRC Japan Atomic Energy Research Institute Tokai Ibaraki ken Japan Michael Monkenbusch Dieter Richter and Dietmar Schwahn IFF Forschungszentrum Julich GmbH Julich Germany Bela Farago Institute Laue Langevin Grenoble France Received February accepted September using small angle neutron scattering SANS and neutron spin echo NSE have quantitatively investigated the static inhomogeneity poly isopropyl acrylamide gel PNIPA microscopic length scales where wave number scattered neutrons NSE revealed that lower the concentration uctuations the PNIPA gel decays more slowly compared the PNIPA solution without crosslinks According our scenario that the slower decay found for the PNIPA gel due the static inhomogeneity coexisting the swollen gel small angle scattering obtained SANS has been quantitatively decomposed into thermal and static scattering components respectively and It was further revealed that the region where becomes dominant closely related that for the abnormal butter scattering under stretching and the temperature increases toward the temperature for volume phase transition of squared Lorentzian shape increases more drastically than of Lorentzian shape These ndings were quantitatively understood the theoretical framework Panyukov and Rabin Macromolecules Onuki Phys France taking into account stress uctuatio | |||||||||||
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