REU Supplement: Characterization of Polymer Interphases Using Surface-Enhanced Raman Scattering

REU 补充：使用表面增强拉曼散射表征聚合物界面

• 批准号: 8823071
• 负责人: F. James Boerio
• 金额: --
• 依托单位: University of Cincinnati Main Campus
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-12-01 至 1993-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8823071&HistoricalAwards=false
• 关键词: REU; Supplement; Characterization; Polymer; Interphases

An innovative analytical technique known as surface-enhanced Raman scattering (SERS) is being used in combination with other surface analysis techniques for the non-destructive characterization of "interphases" formed when polymer systems are adsorbed onto or cured against metal substrates. SERS is being used to investigate the adsorption of block copolymers and mixtures of homopolymers onto substrates such as silver and copper. SERS is also being used to determine the effect that metal substrates have on the molecular structure of polymers cured against them. The goal is to obtain fundamental information regarding catalysis or inhibition of curing reactions by metals, configurations of polymers adsorbed onto metal substrates, preferential adsorption of components of polymer systems onto metals, mechanisms by which polymers and small molecules interact with metals, extent of cure as a function distance away from a metal surface and into a polymer cured against the metal, and migration of metal ions into polymers cured against metal substrates. Processes such as preferential adsorption of components of a polymer systems onto a substrate and catalysis or inhibition of reactions within the polymer by the substrate lead to the formation of an interphase in the polymer adjacent to the substrate that has chemical and physical properties distinct from those of the bulk polymer. Since the macroscopic properties of adhesive bonds and composites are controlled by the interphase, it is essential to determine and control the molecular structure of interphases. SERS is ideal for this purpose since it is inherently surface selective and does not require a polymer to be separated from a substrate for the interphase to be examined as do virtually all other surface analysis techniques. The results obtained are being used to tailor the molecular structure of interphases so as to obtain enhanced environmental stability in structural adhesive joints and composites.

一种创新的分析技术称为表面增强的拉曼散射（SER）与其他表面分析技术结合使用，用于在聚合物系统被固定在或固化金属底物上时形成的“相互重点”的非破坏性表征。 SER被用于研究块共聚物和均聚物的混合物在银和铜等底物上的吸附。 SER还用于确定金属底物对它们固化的聚合物分子结构的影响。 目的是获取有关金属对催化或抑制固化反应的基本信息，聚合物的配置吸附在金属底物上，优先吸附聚合物系统的成分到金属，通过这些机制，聚合物和小分子与金属的距离和金属的距离相互作用，并与金属的距离相互作用，将金属的距离迁移到金属范围内，并与金属的距离迁移，使金属的距离迁移到金属的范围内。固化金属底物。 诸如聚合系统组成的组分在底物上的优先吸附，以及通过底物对聚合物内反应的催化或抑制，从而导致在与底物相邻的聚合物中形成了与具有化学和物理特性不同的聚合物中的相间的形成。 由于粘合键和复合材料的宏观特性受相互作用的控制，因此必须确定和控制相互作用的分子结构。 对于此目的，SER是理想的选择，因为它本质上是表面选择性的，并且不需要将聚合物与基板分离，以便与几乎所有其他表面分析技术进行检查以进行检查。 所获得的结果用于量身定制相互作用的分子结构，以获得结构粘合接头和复合材料中的环境稳定性。