Ion Beam and Surface Analytical Studies of Macromolecular Interfaces

9303032 Gardella 这项研究涉及的研究，旨在了解聚合物表面的结构和反应性。 该研究计划的一个特别重点是强调改进表面敏感的光谱测量，以获得大分子表面的结构，键合和反应性信息。 特别地，通过Langmuir-Blodgett（LB）技术构建模型系统，以确定二次离子质谱（西姆斯）、高分辨率电子能量损失谱（HREELS）以及用于化学分析的角度和能量相关电子谱（ESCA或X射线光电子能谱，XPS）的定性和定量能力以及采样深度。 西姆斯，ESCA和红外光谱方法的结果与表面能，热分析，电子显微镜，和其他更成熟的方法相结合，在解决聚合物表面科学中的三个一般问题。 一个重点是提供定量描述的薄分子，单体和聚合物薄膜制备的LB和“自组装”的方法的表面反应性。 第二组项目旨在描述选定的多组分和多相聚合物，特别是那些相分离的聚合物的近表面组成和结构。 重点放在确定准备的效果和评估组合物作为深度的函数。 研究的第三个领域涉及使用低功率等离子体和化学反应对含氟聚合物进行表面化学改性。 未来三年的研究建立在以前的工作基础上，新的研究计划将强调使用定量西姆斯方法研究界面聚合物化学。 本研究的目的是发展定量测量聚合物表面组成的方法。 这类信息对于理解诸如粘附和生物相容性等应用至关重要。 ***

9303032 Gardella This research deals with studies directed at understanding the structure and reactivity of polymer surfaces. A special focus of the research program is emphasis on refining surface-sensitive spectroscopic measurements to derive structure, bonding, and reactivity information from macromolecular surfaces. In particular, model systems are constructed by Langmuir-Blodgett (LB) techniques to determine the qualitative and quantitative capabilities, and sampling depths of Secondary Ion Mass Spectrometry (SIMS), High Resolution Electron Energy Loss Spectrometry (HREELS), and angle and energy dependant Electron Spectroscopy for Chemical Analysis (ESCA or X-Ray Photoelectron Spectroscopy, XPS). Results from SIMS, ESCA and infrared spectroscopic methods are combined with surface energetics, thermal analysis, electron microscopy, and other more established methods in addressing three general problems in polymer surface science. One focus is to provide quantitative descriptions of the surface reactivity of thin molecular, monomer, and polymer films prepared by LB and "self-assembly" methods. A second group of projects aims to describe the near-surface composition and structure of selected multicomponent and multiphase polymers, especially those which are phase separated. Emphasis is placed on determining the effects of preparation and evaluating the composition as a function of depth. The third area of investigation involves surface chemical modification of fluoropolymers using both low-wattage plasmas and chemical reactions. The studies for the next three-year period build on the previous work, and the new research program will emphasize the use of quantitative SIMS methods study interfacial polymer chemistry. This research aims to develop quantitative methods of measuring the composition of polymer surfaces. This type of information in essential for an understanding of such applications as adhesion and biocompatibility. ***