Precise Acid Copolymers and Ionomers: Morphology, Dynamics and Mechanical Properties

精密酸共聚物和离聚物：形态、动力学和机械性能

• 批准号: 1103858
• 负责人: Karen Winey
• 金额: $ 51.2万
• 依托单位: University of Pennsylvania
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-07-01 至 2015-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1103858&HistoricalAwards=false
• 关键词: Precise; Acid; Copolymers; Ionomers; Morphology

TECHNICAL SUMMARYPrecise acid copolymers are novel materials having functional groups spaced exactly evenly along a linear polyethylene. For example, a phosphonic acid group can be placed on every 9th, 15th or 21st carbon. The proposed project involves nine precise acid copolymers and one random acid copolymer having carboxylic acid and phosphonic acid groups with mono- or geminal-substitution. These materials have established synthetic routes. Winey's morphological studies of the acid copolymers will use X-ray scattering, HAADF STEM, and electron diffraction to establish the crystalline structure of the polyethylene segments and the nature of the acid group assemblies. The acid copolymers will be neutralized with Li, Na, Cs, and Zn to form partially- and fully-neutralized ionomers in which Winey will probe the size, shape, spatial arrangement, and composition of the ionic aggregates. The precision of these acid copolymers and ionomers is known to yield remarkable uniformity in the morphologies, making data interpretation and comparisons with simulations more rigorous. The dynamics and mechanical properties will be studied for the first time in three precise acid copolymers and one random acid copolymer, along with their ionomers. The property measurements will include melt rheology, small-strain compression testing to explore elastic deformations, and large-strain, cyclic compression testing to study plastic deformation. The PI's group has highly specialized expertise to study the morphology, dynamics, and mechanical properties of these remarkable polymers in terms of both demonstrated prior work and existing collaborations. NON-TECHNICAL SUMMARYThe PI will study an extraordinary set of functional polymers with the ultimate goal of knowing how the functional groups are arranged and thereby how their arrangement dictates their mechanical properties. These functional polymers have an acid group on every 9th, 15th or 21st carbon atom along a polyethylene molecule. The unprecedented precision in these molecules will lead to better structural order at both the micro- and nanoscale, which, in turn, enable improved correlations between molecular structure and properties. The PI has established collaborations with synthetic chemists, spectroscopists, and theorists to explore these remarkable materials, and within this interdisciplinary team the teaching, learning, and training of more students and researchers will be significantly enriched. These precise polymers are based on polyethylene, which constitutes the largest class of commercial polymers. This project involves the first dynamical and mechanical property measurements of these materials and in so doing will evaluate their commercial potential.

技术概述精密酸共聚物是具有沿着线性聚乙烯精确均匀沿着分布的官能团的新型材料。 例如，膦酸基团可以位于每第9、第15或第21个碳上。 该项目涉及九种精确的酸共聚物和一种具有羧酸和膦酸基团的单取代或双取代无规酸共聚物。 这些材料已经建立了合成路线。 Winey对酸共聚物的形态学研究将使用X射线散射、HAADF STEM和电子衍射来建立聚乙烯链段的晶体结构和酸基团组装的性质。 酸共聚物将与Li，Na，Cs和Zn中和以形成部分中和和完全中和的离聚物，其中Winey将探测离子聚集体的大小，形状，空间排列和组成。 已知这些酸共聚物和离聚物的精确性在形态上产生显著的均匀性，使得数据解释和与模拟的比较更加严格。 动力学和力学性能将首次研究在三个精确的酸共聚物和一个无规酸共聚物，沿着与他们的离聚物。 性能测量将包括熔体流变学、探索弹性变形的小应变压缩测试和研究塑性变形的大应变循环压缩测试。 PI的团队拥有高度专业化的专业知识，可以根据先前的工作和现有的合作来研究这些卓越聚合物的形态、动力学和机械性能。 非技术总结PI将研究一组特殊的功能聚合物，最终目标是了解官能团是如何排列的，从而了解它们的排列如何决定它们的机械性能。 这些官能聚合物在沿着聚乙烯分子的每沿着第9、第15或第21个碳原子上具有酸基团。 这些分子中前所未有的精确度将导致在微米和纳米尺度上更好的结构秩序，这反过来又能够改善分子结构和性质之间的相关性。 PI与合成化学家，光谱学家和理论家建立了合作关系，以探索这些非凡的材料，在这个跨学科团队中，更多学生和研究人员的教学，学习和培训将得到显着丰富。 这些精密聚合物基于聚乙烯，聚乙烯是最大的一类商业聚合物。 该项目涉及这些材料的第一次动态和机械性能测量，并在此过程中评估其商业潜力。