Homogeneous and inhomogenous polyacrylamide gels as observed by small angle neutron scattering: A connection with elastic properties |
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Authors: | L. Benguigui F. Boué |
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Affiliation: | (1) Laboratoire Léon Brillouin, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France, FR;(2) Solid State Institute, Technion-Israel Institute of Technology, 32000 Haifa, Israel, IL |
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Abstract: | Small angle neutron scattering of polyacrylamide solutions and gels is presented for different polymer and cross link concentrations. The gels are analyzed in connection with their elastic properties. For less than 11% of polymer concentration and for small cross link contents , it was found that the gels are no more heterogeneous than the solutions. This corresponds to the range of where the elastic modulus increases with . For larger cross link contents when the elastic modulus decreases if increases, the sample appears to be strongly heterogeneous with a large size distribution of the inhomogeneities. The results are compared with the recent model of Oshmyan and Benguigui of the elastic properties of the polyacrylamide gels. Thus a relation can be proposed between the observation of the inhomogeneities by scattering and the mechanical properties Received 30 December 1997 and Received in final form 26 June 1998 |
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Keywords: | PACS. 61.41.+e Polymers elastomers and plastics - 61.12.-q Neutron diffraction and scattering - 62.20.-x Mechanical properties of solids |
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