Collaborative Research: Analysis and Properties of Co-continuous Blends - A Numerical and Experimental Investigation

合作研究：共连续共混物的分析和性能 - 数值和实验研究

• 批准号: 0314463
• 负责人: Vittorio Cristini
• 金额: $ 13.25万
• 依托单位: University of California-Irvine
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-08-01 至 2006-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0314463&HistoricalAwards=false
• 关键词: Collaborative; Research; Analysis; Properties; Co

A joint theoretical, numerical and experimental study of co-continuous polymer blends under processing flow conditions is performed. Co-continuous blends consist of distinct continuous phases that form under appropriate conditions of flow and mass compositions near the phase-inversion point. This co-continuous regime leads to synergistic properties of the materials after processing, such as high electrical conductivity coupled to light weight and optimal mechanical response. This study is aimed at the development of criteria for detection, conditions for production, and to a better understanding of the stability of co-continuous blends. The Newtonian flow regime is investigated and the effect of a third component, i.e. surfactants, is studied. To perform this study, novel, state-of-the-art numerical methods are developed and applied to perform large-scale simulations. In parallel, experiments are targeted to provide insight and validation of the mathematical models, simulations and theory.A joint theoretical, computational and experimental study of co-continuous polymer blends is performed. Co-continuous polymer blends consist of distinct sponge-like phases where one of the phases plays the role of the sponge and the other its complement. Such blends offer an important route to materials with unique combinations of properties not available insingle polymers or in blends with traditional dispersed (non continuous) droplet morphology. These unique properties impact strongly applications in the areas of materials and manufacturing, and biotechnology. For example, mechanical properties such as impact strength and tensile strength can exceed those of either blend component. Another application of co-continuous polymer blends is products for mass transfer control. In particular, a water-permeable phase containing a desiccant can be used to remove moisture from moisture sensitive products such as food or pharmaceuticals while the other phase provides mechanical strength. The key to performance in these products is the control of pore size and volume. This fundamental study brings together state-of-the-art mathematical and numerical analysis, modeling and large-scale scientific computation with an innovative experimental program. The experiments are targeted to provide insight and validation of the mathematical models, simulations and theory. This research is aimed to provide guidelines for controlling pore size and volume of the blends and thus to optimize the blend properties. It is expected to lead to significant improvements in the industrial fabrication processes of co-continuous blends and in the properties of the final products.

对加工流动条件下共混聚合物共混物进行了理论、数值和实验研究。共连续共混物由不同的连续相组成，在相变点附近，在适当的流动和质量组成条件下形成。这种共连续的制度导致了材料在加工后的协同性能，如高导电性与重量轻相结合和最佳的机械响应。这项研究的目的是开发检测标准，生产条件，并更好地了解共连续共混的稳定性。对牛顿流态进行了研究，并研究了第三组分--表面活性剂的影响。为了进行这项研究，开发了新的、最先进的数值方法，并应用于进行大规模的模拟。同时，通过实验对数学模型、模拟和理论进行深入分析和验证。对共混聚合物进行了理论、计算和实验的联合研究。共连续聚合物共混物由不同的海绵状相组成，其中一相扮演海绵的角色，另一相扮演海绵的补充物。这类共混物提供了一条重要途径，使材料具有单一聚合物或具有传统分散(非连续)液滴形态的共混物所不具备的独特性能组合。这些独特的性质对材料、制造和生物技术领域的应用产生了强烈的影响。例如，机械性能，如冲击强度和拉伸强度，可以超过任何一种共混组分。共连续聚合物共混的另一个应用是用于传质控制的产品。特别是，含有干燥剂的透水相可用于去除食品或药品等对水分敏感的产品中的水分，而另一相则提供机械强度。这些产品性能的关键是控制孔的大小和体积。这项基础性研究将最先进的数学和数值分析、建模和大规模科学计算与创新的实验计划结合在一起。这些实验的目的是提供对数学模型、模拟和理论的洞察和验证。本研究旨在为控制共混物的孔径和体积，从而优化共混物的性能提供指导。预计这将显著改善共连续共混物的工业制造工艺和最终产品的性能。