Mechanical Control of Polymer Morphology and Properties: Theory and Simulation

聚合物形态和性能的机械控制：理论与模拟

• 批准号: 9709101
• 负责人: Anna Balazs
• 金额: $ 32万
• 依托单位: University of Pittsburgh
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-08-01 至 2003-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9709101&HistoricalAwards=false
• 关键词: Mechanical; Control; Polymer; Morphology; Properties

9709101 Balazs This is a theoretical research grant to study the effects of applied forces on polymer films and blends in order to fabricate tailored interfaces and high-strength materials. To do this, theoretical models and computer simulations will be developed to incorporate external forces; determine how these forces affect morphology; and, to correlate morphology to macroscopic properties. In the study of polymer films, the focus will be on polymer chains tethered to solid surfaces. The interactions between such polymer-coated surfaces are responsible for stabilizing colloidal solutions and reducing friction between interfaces. To model this problem of mechanically compressing, stretching or deforming confined polymer layers, two-dimensional self-consistent field calculations and scaling theory will be used. The results will provide guidelines for fabricating optical devices, such as bistable switches, flocculating agents, which are important in the production of wood and paper products, and layered composites with tailored properties. In the study of polymer blends, the focus will be on the mixing of "off-the-shelf" polymers. This process holds considerable promise as a means of creating new materials at relatively low cost. The actual fabrication of polymer blends, however, poses significant challenges. Most polymers are immiscible and phase separate into macroscopic domains. Shear and flow can produce finer dispersements which improve mechanical properties. %%% This research grant will use theoretical models and computer simulations to study the impact of various forces on the properties of polymers. In particular, the research will study polymer films, such as are used for coatings, and polymer blends (mixed polymers). These studies are at the forefront of research in polymer science and engineering, Besides being of great fundamental interest, and a significant theoretical challenge, the research has the potential to directly affect th e design and production of new materials. ***

9709101 Balazs这是一项理论研究补助金，用于研究施加在聚合物薄膜和共混物上的力的影响，以制造定制的界面和高强度材料。为此，将发展理论模型和计算机模拟以纳入外力；确定这些力如何影响形态；并且，将形态与宏观性质联系起来。在聚合物薄膜的研究中，重点将放在束缚在固体表面的聚合物链上。这种聚合物涂层表面之间的相互作用负责稳定胶体溶液和减少界面之间的摩擦。为了模拟这种机械压缩、拉伸或变形受限聚合物层的问题，将使用二维自一致场计算和缩放理论。研究结果将为光学器件的制造提供指导，如双稳态开关、絮凝剂（这在木材和纸制品的生产中很重要），以及具有定制性能的分层复合材料。在聚合物共混物的研究中，重点将放在“现成”聚合物的混合上。作为一种以相对较低的成本制造新材料的方法，这一过程具有相当大的前景。然而，聚合物共混物的实际制造面临着重大挑战。大多数聚合物是不可混溶的，相分离成宏观结构域。剪切和流动可以产生更精细的分散剂，从而改善机械性能。这项研究经费将使用理论模型和计算机模拟来研究各种力对聚合物性能的影响。特别是，该研究将研究聚合物薄膜，如用于涂料和聚合物混合物（混合聚合物）。这些研究处于聚合物科学和工程研究的前沿，除了具有重大的基础兴趣和重大的理论挑战外，这些研究还具有直接影响新材料设计和生产的潜力。＊＊＊