ROW: Ionic Interactions and Morphology in Ionomers by Electron Magnetic Resonance Methods

ROW：通过电子磁共振方法研究离聚物中的离子相互作用和形态

• 批准号: 8718947
• 负责人: Shulamith Schlick
• 金额: $ 38.97万
• 依托单位: University of Detroit Mercy
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-03-01 至 1993-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8718947&HistoricalAwards=false
• 关键词: ROW; Ionic; Interactions; Morphology; Ionomers

The objective of this research is to study the molecular and structural aspects of phase separation in ionomers (ionic polymers) by continuous wave (cw) and pulsed Electron Spin Resonance (ESR) methods. This approach is well suited for studying the complex heterogeneous structure of ionomers, because it is non-invasive and allows selective study of the portion of the sample where the paramagnetic probe is located. In the hydrophilic phase, attempts will be made to define the local environment of the cations, the intercation distance and the size of ionic aggregates. The mobility and degree of crystallinity of the polymer chains in the hydrophobic phase will be studied using peroxy radical probes. The interface, and the penetration of the polar regions into the organic network, will be studied by following the partition and dynamics of nitroxide probes whose hyperfine splittings are sensitive to the polarity of the medium. Weak interactions of the paramagnetic centers with neighboring protons and deuterons, which cannot be detected by cw ESR, will be studied by Electron Spin Echo (ESE) spectroscopy. DSC studies will be used to detect heterogeneity in the phase structure and to deduce the relative amounts of bound and mobile water in the system. Perfluorinated ionomers containing sulfonic and carboxylic groups and polyurethane ionomers containing carboxylic groups will be investigated. These studies are important for an understanding of ionic transport and selectivity in synthetic and biological membranes, of photo-induced charge separation processes in ionomers, and also for polymer blends in which phase separation is prevented by crosslinking ionic groups.

这项研究的目的是研究分子和 离聚物中相分离的结构方面（离子 聚合物）的连续波（cw）和脉冲电子自旋 共振（ESR）方法。 这种方法非常适合于 研究离聚物的复杂异质结构，因为 它是非侵入性的，并允许选择性研究的一部分， 顺磁探针所在的样品。 在 亲水相，将尝试定义局部 阳离子环境、阳离子间距和阳离子尺寸 离子聚集体。 的流动性和结晶度， 疏水相中的聚合物链将使用 过氧自由基探针 界面，和渗透的 极地地区的有机网络，将研究 根据氮氧探针的分配和动力学， 超精细分裂对介质的极性敏感。 顺磁中心与相邻中心的弱相互作用 质子和氘核不能被cw ESR检测到， 电子自旋回波（ESE）光谱学。 DSC研究 将用于检测相结构中的异质性， 以推断出结合水和移动的水的相对量 系统全氟化离聚物含有磺酸和 羧基和含羧基的聚氨酯离聚物 团体将进行调查。 这些研究对于一个 理解合成和合成过程中的离子传输和选择性， 生物膜，光致电荷分离 在离聚物中的工艺，以及在聚合物共混物中， 通过交联离子基团防止分离。