Molecular Structural Design of Miscible Polymer Blends

互溶聚合物共混物的分子结构设计

• 批准号: 8900704
• 负责人: Donald Paul
• 金额: $ 26.5万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-12-01 至 1993-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8900704&HistoricalAwards=false
• 关键词: Molecular; Structural; Design; Miscible; Polymer

Miscible polymer blends have a simple continuous relationship between properties and composition, when amorphous, unlike many immiscible blends whose properties may fall below those of the components. Miscible blends of high-preformance polymers with less expensive polymers consequently offer the advantage of specifying performance levels within wide limits for minimum cost. The goal of this research is to advance the principles, through example, for controlling phase behavior of blends of this type through molecular structural design. In particular, this research focuses on identifying examples of miscible blends of existing or new high-performance polymers, such as polycarbonates, polysulfones, polyacrylates, etc. with less expensive polymers based on commodity monomers like styrene, methyl methacrylate, acrylonitrile, etc. The strategy is to find homo-polymer pairs that are energetically close to the border of miscibility and then use copolymerization to make them usefully miscible via the benefits of intramolecular repulsion effects. A search for such systems must be guided by principles, since the number of compositional variables is too great to randomly explore them all. This work involves application of the latest theories of miscibility and techniques for quantifying interactions in addition to synthesis of targeted polymers or copolymers. In addition to identification of potentially useful materials, this work should answer important basic question aboutintermolecular interactions.

混相聚合物共混物在无定形时，其性质和组成之间具有简单的连续关系，不像许多非混相共混物，其性质可能低于组分。因此，高性能聚合物与较便宜聚合物的混相共混提供了以最小成本在宽范围内指定性能水平的优势。本研究的目的是通过实例，通过分子结构设计来控制这类共混物的相行为。特别是，本研究的重点是确定现有的或新的高性能聚合物，如聚碳酸酯、聚砜、聚丙烯酸酯等与基于苯乙烯、甲基丙烯酸甲酯、丙烯腈等商品单体的较便宜的聚合物的混相共混的例子。策略是找到能量上接近混相边界的同聚物对，然后通过分子内排斥效应的好处使用共聚使它们有效地混相。寻找这样的系统必须遵循原则，因为组成变量的数量太大，无法随机探索它们。这项工作包括应用最新的混相理论和定量相互作用的技术，以及合成目标聚合物或共聚物。除了鉴定潜在有用的材料外，这项工作还应该回答有关分子间相互作用的重要基本问题。