Neutron scattering by polymer coils under different constraints
Neutron scattering by polymer coils under different constraints
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不同约束下聚合物线圈的中子散射
DOI：
10.1107/s0021889878013746
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发表时间：
1978
影响因子：
6.1
通讯作者：
C. Picot
中科院分区：
文献类型：
--
作者：
M. Nierlich;C. Williams;F. Boué;J. Cotton;M. Daoud;M. Farnoux;G. Jannink;C. Picot
介绍了聚合物线圈在中性半稀溶液、浓聚电解质溶液和拉伸体三种不同环境下的中子散射数据。每种环境都对线圈提供了特定的约束。在中性溶液中，短程体积相互作用使链膨胀。远距离库仑相互作用将链拉伸到相当大的尺寸。块状材料的机械拉伸也会改变布朗线圈的形状。在前两种情况下，结构因素作为动量传递的函数进行讨论。这一因素反映了长程组织的特点。对于块状材料，讨论了直接从散射数据中获得的形状因子，并在质子化矩阵中使用各向同性标记。
Neutron scattering data are presented for polymer coils in three different environments: neutral semi-dilute solutions, concentrated polyelectrolyte solutions and stretched bulk. Each of these environments provides a specific constraint to the coil. The short-range volume interactions swell the chains in neutral solutions. The long-range Coulomb interactions stretch the chains to a considerable size. Mechanical stretching of bulk material also modifies the Brownian coil shape. In the first two cases, the structure factor is discussed as a function of momentum transfer. This factor reflects characteristic long-range organization. For the bulk material, the form factor is discussed which is obtained directly from the scattering data, with isotropic labelling used in the protonated matrix.