Scattering from deformed swollen gels with heterogeneities
Scattering from deformed swollen gels with heterogeneities
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具有异质性的变形溶胀凝胶的散射
DOI：
10.1051/jp2:1992112
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
A. Onuki
中科院分区：
文献类型：
--
作者：
A. Onuki
当弹性材料发生各向异性变形时，刚度的不均匀性通常会产生长范围的密度变化。在溶胀的凝胶中效果尤其增强。我们根据一般仿射变形下的这种冻结密度偏差计算结构因子。它在最大拉伸方向上最大化，而热波动在同一方向上最小化。结果，根据最近的散射实验，在单轴延伸下，随着不均匀性强度或膨胀率的增加，从正常蝴蝶散射图案到异常蝴蝶散射图案发生交叉。此外，剪切变形下的散射图案与剪切流下相分离的半稀聚合物溶液的散射图案非常相似。
When elastic materials are anisotropically deformed, heterogeneities in stiffness generally produce long-range density variations. The effect is particularly enhanced in swollen gels. We calculate the structure factor from such frozen denstiy deviations under general affine deformations. It is maximized in the most stretched direction, whereas that from the thermal fluctuatins is minimized in the same direction. As a result, under uniaxial extension, a crossover occurs from normal to abnormal butterfly scattering patterns wiht increase of the strength of inhomogeneity or the swelling ration in accord with recent scattering experiments. Furthermore, scattering patters under shear deformation closely resemble those from phase-separating semidilute polymer solutions under shear flow.