HARD-SPHERE INTERACTIONS BETWEEN SPHERICAL DOMAINS IN DIBLOCK COPOLYMERS
HARD-SPHERE INTERACTIONS BETWEEN SPHERICAL DOMAINS IN DIBLOCK COPOLYMERS
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DOI：
10.1021/ma00139a013
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发表时间：
1984-01-01
期刊：
影响因子：
5.5
通讯作者：
THOMAS, EL
中科院分区：
文献类型：
--
作者：
KINNING, DJ;THOMAS, EL
用Percus-Yevickhard-sphere液体理论对含有无序排列的球形结构域的嵌段共聚物体系的小角散射数据进行建模，以获得颗粒间干涉对散射强度的贡献。通过基于拟合最低角度干涉峰和来自较高角度形状因子散射峰的位置的域半径来选择有效硬球相互作用半径，可以相当充分地解释全散射图案。硬球半径和域大小之间的差异归因于域之间的最接近距离，并且对应于约1.5倍的矩阵块链未扰动回转半径。因此，小角度散射数据可以提供一个测量的分离距离，在该距离处的域间电位变得高度排斥。
Small-angle scattering data from diblock copolymer systems containing disordered arrangements of spherical domains are modeled with the Percus-Yevickhard-sphere liquid theoryto obtain the interparticle interference contribution to the scattered intensity. By choosing an effective hard-sphere interaction radius based on fitting the lowest angle interference peak and a domain radius from the location of the higher angle form factor scattering peaks, the full scattering pattern can be quite adequately accounted for. The difference between the hard-sphere radius and the domain size is attributed tothe closest distance of approach between domains and corresponds to approximately 1.5 times the matrix block chain unperturbed radius of gyration. Thus, small-angle scattering data can provide a measurement of the separation distance at which the interdomain potential becomes highly repulsive.