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.

一种称为表面增强拉曼散射 (SERS) 的创新分析技术与其他表面分析技术结合使用，可对聚合物系统吸附到金属基材上或在金属基材上固化时形成的“界面”进行非破坏性表征。 SERS 用于研究嵌段共聚物和均聚物混合物在银和铜等基材上的吸附。 SERS 还用于确定金属基材对其固化的聚合物分子结构的影响。 目标是获得有关金属催化或抑制固化反应、吸附在金属基材上的聚合物的构型、聚合物体系组分在金属上的优先吸附、聚合物和小分子与金属相互作用的机制、固化程度等方面的基本信息。远离金属表面并进入针对金属固化的聚合物的函数距离，以及金属离子迁移到针对金属基材固化的聚合物中。 诸如聚合物系统的组分优先吸附到基材上以及基材对聚合物内的反应的催化或抑制等过程导致在邻近基材的聚合物中形成界面，其具有不同于聚合物体系的化学和物理性质。本体聚合物。 由于粘合剂和复合材料的宏观性能是由界面控制的，因此确定和控制界面的分子结构至关重要。 SERS 非常适合此目的，因为它本质上具有表面选择性，并且不需要像几乎所有其他表面分析技术那样将聚合物与基材分离来检查界面。 获得的结果用于调整界面的分子结构，从而提高结构粘合接头和复合材料的环境稳定性。