PECASE: Photopolymerization Kinetics and Consequent Nanostructure of Lyotropic Liquid Crystalline Systems

摘要0093911南密西西比大学艾伦·盖蒙可聚合溶致液晶 (LLC) 系统呈现的独特有序性为许多潜在的重要应用提供了多种结构。 然而，使用聚合 LLC 材料的主要障碍是在整个聚合过程中保持和控制这种结构的能力。 通常，热力学驱动的相分离发生在聚合过程中，留下很少或不留下液晶有序。 PI计划的研究主题是利用光聚合动力学作为纳米探针来预测和控制LLC系统的纳米结构。 将使用 LLC 单体聚合和 LLC 模板聚合的组合来解决两个基本且互补的问题。 首先，有序度和有序度对聚合行为有何影响？ 将监测跨越 LLC 相范围的材料的光聚合，以了解聚合过程中发生的变化。 将检查可能影响相行为和结构控制的因素，包括温度、LLC 相结构和稳定性、组成、聚合时间尺度和迁移率。 其次，聚合对结构演化和控制这种结构的能力有什么影响？ 影响相行为、相分离、聚合物结构和各向异性的因素将在聚合之前、期间和之后进行广泛的研究。 这两个问题的结果将相关联，形成控制最终聚合物结构的动力学和热力学因素的完整模型。 这项研究的具体成果是（1）对聚合和最终聚合物结构的控制机制有了全面的了解；（2）建立了 LLC 系统分子水平设计的原理和方法，该系统具有专为特定应用而设计的可控和可调节的纳米结构。该 PECASE 项目的一个主要主题将是学生教育。 将强调本科生和研究生研究人员广泛参与发现学习环境。 作为吸引最优秀和最聪明的学生学习聚合物科学与工程的一种手段，高中化学聚合物模块是教育部分的主要组成部分。 将与花瓣高中合作开发一个为期三周的模块，介绍聚合物科学领域的基础知识、应用和研究机会。 讲座、演示、实验室和测试材料将相互关联，以强调聚合物在日常生活中的重要性。 虚拟实验室、基于网络的材料和动手实验将被纳入其中。 该课程将涉及学区、大学和当地行业的广泛规划和参与。 成功实施后，该模块将被带到哈蒂斯堡和奥克格罗夫学区。 根据这些经验，将为全州高中化学教师开发为期两天的指导课程。 将特别关注科学和工程领域代表性不足群体比例较高的地区的参与。 该模块还将针对大专和大学的化学入门课程进行适当修改。

ABSTRACT0093911University of Southern MississippiAllan GuymonThe unique ordering presented by polymerizable lyotropic liquid crystalline (LLC) systems provides a wide variety of structures for a number of potentially important applications. The major obstacle in using polymerized LLC materials, however, is the ability to remain and control this structure throughout the polymerization. Typically, thermodynamically driven phase separation occurs during polymerization, leaving little or no liquid crystalline order. The theme of the research planned by the PI is to use the photopolymerization kinetics as a nanoscopic probe to predict and control the nanostructure of LLC systems. Two fundamental and complementary questions will be addressed using a combination of polymerization of LLC monomers and LLC templated polymerizations. First, what role do order and the degree of order have in influencing the polymerization behavior? The photopolymerization of materials spanning the gamut of LLC phases will be monitored to understand changes that occur during polymerization. Factors that may influence phase behavior and structure control including temperature, LLC phase structure and stability, composition, polymerization time scale, and mobility will be examined. Second, what influence does the polymerization have on structural evolution and the ability to control this structure? Factors influencing phase behavior, phase separation, polymer structure and anisotropy will be examined extensively before, during and after polymerization. Results for both questions will be related forming a complete model of the factors, both kinetic and thermodynamic, governing the ultimate polymer structure. Tangible outcomes of this research are (1) development of a complete understanding of the polymerization and the mechanisms governing ultimate polymer structure and (2) establishment of the principles and methods for the molecular level design of LLC systems with controllable and adjustable nanostructure designed for particular applications.A prevailing theme in this PECASE project will be student education. Extensive involvement of undergraduate and graduate researchers in a discovery learning environment will be emphasized. As a means to attract the best and brightest students to polymer science and engineering, a polymer module for high school chemistry is a primary element of the educational component. In collaboration with Petal High School, a three-week module will be developed that presents the fundamentals, applications, and research opportunities in the field of polymer science. Lecture, demonstration, laboratory, and testing materials will be correlated to emphasize the importance of polymers in everyday life. Virtual labs, web-based materials and hands-on experiments will be incorporated. The curriculum will involve extensive planning and involvement from the school district, the university, and local industry. After successful implementation, the module will be brought to the Hattiesburg and Oak Grove school districts. From these experiences a two-day instruction course will be developed for high school chemistry teachers throughout the state. Special focus will be placed on involvement of districts with high percentages of underrepresented groups in science and engineering. The module will also be modified appropriately for introductory chemistry courses at both junior colleges and universities.