随着高分子在微电子、能源、生物以及纳米材料等领域的不断应用，在介观尺度、微观尺度和分子水平上对高分子材料的结构和性能关系进行有效的研究具有基础性的重要意义。本申请项目针对高分子薄膜这一在理论和应用上都具有重要意义的一维受限体系，结合非线性和频振动光谱和线性红外光谱表征技术，利用和频振动光谱可探测高分子薄膜表界面分子结构的特点，红外光谱可探测高分子薄膜本体分子结构的特点，并基于分子振动光谱的光学偏振选择定则，研究基底上高分子薄膜的表面、界面和本体的分子结构以及结构松弛。目的一是阐明表界面效应和受限效应对高分子薄膜结构和性能的影响，为在实践中应用高分子薄膜提供基础的知识和研究经验；二是发展普适的光谱研究方法，为薄膜体系的研究提供更新的技术手段。

The study on the structure-property of polymers at the mesoscopic, microscopic and molecular levels is of great importance on account of the up-to-date applications of polymers in the fields of microelectronics, energy, biology and nano-materials. This grant application aims at understanding the structure-property relationship of one-dimensional confined polymer thin films by combining nonlinear and linear spectroscopic techniques, i.e. sum frequency generation (SFG) vibrational spectroscopy and infrared (IR) spectroscopy. Based on the spectroscopic signals contributed from the surfaces/interfaces for SFG spectroscopy and from the bulk for IR spectroscopy, the surface, interfacial and bulk molecular structures and the structural relaxation of the polymer thin films will be investigated with the assistance of optical polarization selection rules for the molecular vibrational spectroscopy. There are two purposes for this grant application. One is to provide the fundamental knowledge and research experience by resolving the issues of the surface/interfacial and confinement effects with respect to the structure-property relationship of the polymer thin films. The other is to provide the state-of-the-art characterization techniques for studying thin film systems by developing the universally applicable methodologies for molecular vibrational spectroscopy.