Mid-Segment Polydispersity as a New Tool for Manipulating ABA Triblock Copolymer Morphologies and Properties

中段多分散性作为操纵 ABA 三嵌段共聚物形态和性能的新工具

• 批准号: 1307606
• 负责人: Mahesh Mahanthappa
• 金额: $ 34.5万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-06-01 至 2016-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1307606&HistoricalAwards=false
• 关键词: Mid; Segment; Polydispersity; New; Tool

TECHNICAL SUMMARYApplications of commodity and specialty block copolymers rely on their useful combinations of properties, which stem from covalently linking two or more dissimilar homopolymer segments into a single macromolecule. By virtue of their thermodynamically driven self-assembly into complex yet well-defined nanoscale morphologies, block copolymers are useful as thermoplastics and thermoplastic elastomers, advanced molecular separations membranes, and new templates for fabricating next-generation microelectronics. Modern polymerization techniques enable access to a plethora of copolymers containing unusual combinations of chemical functionalities with useful physical properties, at the expense of introducing significant segmental dispersity into one or more blocks of the copolymers. However, the role of broad segmental dispersity on block copolymer phase behavior is not well understood. This project will directly investigate the effects of mid-segment polydispersity on the phase behavior of ABA-type triblock copolymers. Model polydisperse triblock copolymers with varying segmental interaction parameters will be synthesized by tandem polymerization techniques for studies of their composition-dependent phase behavior, using small-angle X-ray scattering, electron microscopy, polymer rheology, and various transport measurements. Characterization of samples near the order-disorder transition (ODT) will help to identify the variables that parameterize the phase behavior of these multicomponent block copolymer mixtures. Ultimately this study aims to transform segmental polydispersity into a new tool for manipulating the morphologies of block copolymers with technologically useful bulk properties.NON-TECHNICAL SUMMARYThe development of innovative polymeric materials possessing unusual combinations of chemical functionalities and useful physical properties is crucial in their myriad applications as high-strength structural materials, water and gas purification membranes, components in organic photovoltaic cells, and materials for high power lithium-ion batteries. Within a highly interdisciplinary research environment, this project will challenge undergraduate and graduate students to conduct hypothesis-driven, crosscutting research at the interface between chemistry, chemical engineering, and materials science. By using modern methods in synthetic polymer chemistry to generate new materials and by characterizing their structures and attendant physical properties, this project will aim to uncover new tools for designing innovative, functional polymers with unusual morphologies and novel properties for a variety of potential applications. An undergraduate polymer chemistry lab and two polymer-oriented lecture demonstrations will be developed for use in general chemistry instruction and in public outreach lectures.

商品和专业块共聚物的技术摘要依赖于其有用的特性组合，这源于将两个或多个不同的均聚物段共价链接到单个大分子中。借助其热力学驱动的自组装成复杂但定义明确的纳米级形态，块共聚物可用作热塑性和热塑性弹性体，晚期分子分离膜以及用于制造下一代微型主体的新模板。现代聚合技术使得能够进入多种共聚物，这些共聚物含有与有用的物理特性的异常组合，以将显着的分段分散性引入一个或多个共聚物块。但是，广泛的分段分散性在块共聚相行为上的作用尚不清楚。该项目将直接研究中段多分散性对ABA型三嵌段共聚物的相行为的影响。使用小角度X射线散射，电子显微镜，聚合物风格和各种传输测量测量值，将通过串联聚合技术来合成与分段相互作用参数不同的模型分散三嵌段共聚物。在订单序列过渡（ODT）附近的样品的表征将有助于确定这些多组分块共聚物混合物的相位行为的变量。最终，这项研究旨在将节段多分散性转变为一种新工具，用于通过技术有用的体积来操纵块共聚物的形态。没有技术的开发，具有创新的聚合物材料的开发，具有与其构造的高度材料，具有相当的化学功能和有用的材料的材料，具有与之相关的材料，并具有较高的材料，并具有较高的材料，并具有较高的材料，并具有范围内的材料，并具有何种性的材料，并构成了范围内的范围，并构成了范围内的范围，并构成了范围的范围，并具有范围的质量，并构成了范围的范围，并具有较高的材料，并构成了范围内的范围，并构成了范围的范围，并具有范围的范围，并具有较高的材料，并具有范围的质量范围。光伏电池和高功率锂离子电池的材料。在高度跨学科的研究环境中，该项目将挑战本科生和研究生进行假设驱动的，在化学，化学工程和材料科学之间的界面上进行横切研究。通过在合成聚合物化学中使用现代方法来生成新材料并通过表征其结构和随之而来的物理特性，该项目将旨在发现具有具有异常形态和新型特性的创新，功能性聚合物的新工具，以实现各种潜在的应用。将开发一个本科聚合物化学实验室和两个面向聚合物的讲座示范，供一般化学教学和公共外展讲座。