Scattering Studies of Polymer Deformation in Flowing Solutions

这项研究将采用光散射来检查 柔性聚合物在流动溶液中的构象。 重点 将集中在拉伸流，这可以极大地扰动 高斯聚合物链从它们的平衡，球形。 尽管它对许多工业过程很重要， 大分子在流动中被拉伸，聚合物结构远离 平衡仍然没有得到很好的理解。 稀释溶液将 使用低角度光散射和低角度光散射进行检查 中子散射将尝试半稀释液和 中等浓度的溶液。 除了稳定 测量，一个新的流动装置将使研究的可能性， 拉氏量中柔性大分子的瞬态拉伸 非定常流 非定常流动通常在这样的 作为纤维纺丝的商业应用，并且已经制造了 很难用常规方法进行系统的检查。 拟议研究的结果将提供更直接、 和不那么模糊的聚合物构象的测量， 通过其他技术获得。

This research will employ light scattering to examine the conformations of flexible polymers in flowing solution. Emphasis will center on extensional flows, which can greatly perturb Gaussian polymer chains from their equilibrium, spherical shape. Despite its importance to many industrial processes in which macromolecules are stretched in flow, polymer structure away from equilibrium is still not well understood. Dilute solutions will be examined using low.angle light scattering, and low.angle neutron scattering will be attempted for semidilute and moderately concentrated solutions. In addition to steady measurements, a new flow device will make possible study of the transient stretching of flexible macromolecules in Lagrangian unsteady flows. Unsteady flows are typically found in such commercial applications as fiber spinning, and have been made difficult to examine systematically with conventional methods. The results of the proposed research will provide more direct, and less ambiguous, measurements of polymer conformation than can be obtained by other techniques.