Polymer-Polymer Interactions, Phase Behavior, and Interfaces

聚合物-聚合物相互作用、相行为和界面

• 批准号: 9726484
• 负责人: Donald Paul
• 金额: $ 31.5万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-02-01 至 2004-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9726484&HistoricalAwards=false
• 关键词: Polymer; Interactions; Phase; Behavior; Interfaces

9726484 Paul The rational development of multicomponent polymer blends (or alloys) requires an understanding of the polymer-polymer interactions involved and how to control them in order to generate materials with useful mechanical properties, obtain optically clear mixtures. (miscibility), disperse impact modifiers in a brittle matrix, reactively compatibilize immiscible mixtures, etc. This proposal outlines a program for obtaining quantitative information on the interactions between pairs of a number of important polymer repeat units. The methodology involves experimental observations of the phase behavior of blend systems that are analyzed in terms of appropriate theories of mixing combined with a mean field binary interaction model. The experimental methods involve copolymer composition mapping, the critical molecular weight method, quantitative analysis of phase diagrams, light scattering, and neutron reflectivity. Specific objectives involve (a) comparison of interactions of acrylate and methaclylate monomer units having various pendant groups with other polymers, (b) effect of bromine atoms in the repeat unit on interactions with other polymers, (c) development of reactive copolymers that are miscible with styrene/acrylonitrile copolymers (SAN) for use in reactive compatibilization of engineering thermoplastics with ABS materials, and (d) comparison of polymer-polymer interfacial thicknesses measured by neutron reflectivity with those predicted from theory using interaction energies determined in this program. The neutron reflectivity studies will be performed on pairs of commercially important polymers like polycarbonate, poly(phenylene ether), etc. with copolymers, e.g., styrene with acrylonitrile, maleic anhydride, etc. The experiments will be done in collaboration with the National Institute of Standards and Technology and industry. In addition, the research will make a systematic study of the kinetics of phase separation of selected blends using a recently constructed light scattering apparatus. This will provide accurate assessment of spinodal temperature-composition curves for use in evaluation of interaction energies as well as information about polymer-polymer diffusion coefficients. %%% The results of this fundamental research will be quantitative information about interactions between polymer repeat unit pairs for use in designing homogeneous or phase separated polymer blends (or alloys) that either are or may be of technological importance. This research will provide a valuable educational experience for students at all levels including postgraduate, PhD, undergraduate, and high school. ***

多组分聚合物共混物（或合金）的合理发展需要了解所涉及的聚合物-聚合物相互作用以及如何控制它们，以便产生具有有用机械性能的材料，获得光学透明的混合物。（混相），在脆性基体中分散冲击改性剂，反应相容非混相混合物等。这一建议概述了一个程序，以获得定量信息对之间的相互作用的一些重要的聚合物重复单元。该方法包括对混合系统相行为的实验观察，并根据适当的混合理论结合平均场二元相互作用模型进行分析。实验方法包括共聚物组成作图、临界分子量法、相图定量分析、光散射和中子反射率。具体目标包括(a)比较具有不同悬垂基团的丙烯酸酯和甲基丙烯酸酯单体单元与其他聚合物的相互作用，(b)重复单元中溴原子对与其他聚合物相互作用的影响，(c)开发可与苯乙烯/丙烯腈共聚物（SAN）混溶的反应性共聚物，用于工程热塑性塑料与ABS材料的反应性增容。(d)用中子反射率测量的聚合物-聚合物界面厚度与用本程序确定的相互作用能从理论预测的厚度的比较。中子反射率研究将在商业上重要的聚合物对上进行，如聚碳酸酯、聚（苯乙烯醚）等与共聚物，如苯乙烯与丙烯腈、马来酸酐等。这些实验将与国家标准与技术研究所和工业界合作完成。此外，本研究还将利用新建立的光散射装置对所选共混物的相分离动力学进行系统的研究。这将为用于相互作用能量的评估以及聚合物-聚合物扩散系数的信息提供准确的温度-组成曲线评估。这项基础研究的结果将是关于聚合物重复单元对之间相互作用的定量信息，用于设计具有或可能具有重要技术意义的均相或相分离的聚合物共混物（或合金）。本研究将为研究生、博士、本科及高中各阶段的学生提供宝贵的教育经验。＊＊＊