GOALI: "Diffusion of Polymer Chains Near Interfaces"

摘要-9810703 L。本提案的目的是研究界面附近不同分子量聚合物链的扩散和平衡浓度，特别是填料或增强颗粒界面，聚合物共混物界面和自由表面。 扩散实验将强调比声誉时间短的时间，这是最具工业重要性的范围。 一系列的实验计划研究聚合物的扩散到表面和界面的动力学，并建立实验条件下，较短或较长的链被吸引到这样的表面优先。 的基础将是使用较长较短的分子量的氘代探针聚合物，以建立不仅对所涉及的表面和界面的扩散速率，而且平衡浓度。 所涉及的聚合物将基于聚苯乙烯和聚（甲基丙烯酸甲酯），二氧化硅作为复合填料之一。 另一系列实验将涉及离子和非离子聚合物的共混物。 离子聚合物部分将被氘化。 通过研究链的有效分子量和回转半径以及它们的有效扩散速率，可以确定离子基团的大小和/或聚集效应之间的关系。 另一组实验将测量链端之间的直接化学反应，这在乳胶膜形成中作为相互扩散的替代方法是重要的。

ABSTRACTCTS-9810703L. Sperling/Lehigh U.The objective of this proposal is to study the diffusion and equilibrium concentration of different molecular weight polymer chains near interfaces, particularly filler or reinforcing particulate interfaces, polymer blend interfaces, and free surfaces. The diffusion experiments will emphasize times shorter than the reputation time, the range of greatest industrial importance. A series of experiments are planned to study the kinetics of diffusion of polymers to surfaces and interfaces, and also to establish experimentally the conditions under which shorter or longer chains are attracted preferentially to such surfaces. The basis will be the use of deuterated probe polymers of longer shorter molecular weights, to establish not only the diffusion rates towards the surfaces and interfaces involved, but also the equilibrium concentrations. The polymers involved will be based on polystyrene and poly(methyl methacrylate), with silica serving as one of the composite fillers. Another series of experiments will involve blends of ionic and non-ionic polymers. The ionic polymer portion will be deuterated. By studying the effective molecular weights and radii of gyration of the chains, as well as their effective diffusion rates, the relationships between the size of the ionic groups and/or aggregation effects can be determined. Yet another set of experiments will measure the direct chemical reaction between the ends of chains, important as an alternate to interdiffusion in latex film formation.