Structures in a semidilute polymer solution induced under steady shear flow as studied by small-angle light and neutron scattering
Structures in a semidilute polymer solution induced under steady shear flow as studied by small-angle light and neutron scattering
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通过小角度光和中子散射研究稳定剪切流下诱导的半稀聚合物溶液中的结构
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发表时间：
2002
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通讯作者：
F. Boué
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作者：
S. Saito;T. Hashimoto;I. Morfin;Peter Lindner;F. Boué
研究了高分子量氘代聚苯乙烯在邻苯二甲酸二辛酯中的半稀溶液在稳态剪切流场中的结构诱导。结合小角光散射（SALS）和小角中子散射（SANS），我们可以得到3个数量级的波数（q）和7个数量级的强度的剪切诱导结构的散射函数。探讨了在给定温度下剪切速率（γ）对结构的影响以及在给定γ下剪切速率（γ）对结构的影响。在一定温度下，当γ大于临界剪切速率γc时，剪切流引起溶液结构的变化，在SANS的低q区产生一种称为“蝴蝶”的散射图案，而在SALS的q区则保持与静态时相同的图案。随着γ的增加，蝴蝶图案不仅在SANS的低q区发生演化，而且在SALS的q区也发生演化。这表明剪切引起的结构...
Structures induced by a steady shear flow in a semidilute polymer solution of high molecular weight deuterated polystyrene in dioctyl phthalate are investigated. By a combined use of small-angle light scattering (SALS) and small-angle neutron scattering (SANS), we are able to obtain scattering functions of the shear-induced structures over 3 orders of magnitude in wavenumber (q) and 7 orders of magnitude in intensity. The changes in the structures with shear rate (γ) at a given temperature and with temperature at a given γ are explored. At a given temperature, the shear flow induces a structural change in the solution at γ larger than a critical shear rate γc, giving rise to a scattering pattern called “butterfly pattern” in the low q region of SANS, while keeping the same pattern as that in the quiescent state in the q region of SALS. As γ increases, the butterfly patterns evolved not only in the low q region of SANS but also in the q region of SALS. This indicates that the shear-induced structures ...