Chemical Reactions on Miscible Polymer Blends: Oxidation

对可混溶聚合物共混物的化学反应的研究是一个领域，其中在化学反应性之上的形态控制的机会对于最终材料性质具有重要意义，特别是在具有临界溶液温度的聚合物共混物中，其中反应温度的变化影响可混性、相分离和化学反应性。对聚苯乙烯（PS）和聚乙烯基甲基醚（PVME）的混溶共混物进行了氧化研究。PVME比聚苯乙烯更容易光氧化和热氧化-允许与氧气的反应性有很大差异。先前的研究表明，均聚物的氧吸收速率与共混物的氧吸收速率显著不同。该研究将涉及-通过使用模型化合物来理解PS/PVME共混物的氧化稳定现象的机械化学方面，对从聚合物体系的氧化实验中直接获得的降解产物的额外研究，特定相互作用如氢键对这些体系中的溶解性和氧化老化的影响，将这些概念扩展到其他体系，以及添加的抗氧化剂的效果及其分布。

Research on chemical reactions on miscible polymer blends is an area in which the opportunities for morphological control on top of chemical reactivity have important implications in regard to final materials properties, especially in polymer blends having critical solution temperatures where changes in reaction temperature affect miscibility, phase separation, and chemical reactivity. Oxidative studies will be carried out on miscible blends of poly(styrene) (PS) and poly(vinyl methyl ether) (PVME). PVME photo-oxidizes and thermo-oxidizes much more readily than polystyrene -- allowing for large differences in reactivity with oxygen. Prior studies have indicated that the rates of oxygen uptake by the homopolymers are significantly different than that of the blends. The research will involve - understanding the mechanistic chemical aspects of the oxidative stabilization phenomena for PS/PVME blends by use of model compounds, additional studies on the degradation products directly obtained from their oxidation experiments on the polymer systems, the effect of specific interactions such as hydrogen bonding on miscibility and oxidative aging in these systems, extension of these concepts into other systems, and the effect of added antioxidants and their distribution.