Polymer Dynamics on Monolayers and in Complex Media

界面现象已经成为聚合物科学的前沿，在涉及表面活性聚合物的分子组织和自组装、具有吸附聚合物链的表面之间的作用力、界面介导链构象和界面处聚合物链段密度分布的各种领域都产生了许多令人兴奋的结果。这是一个针对空气/水和油/水界面上的单分子膜上的聚合物链传输以及向这些界面传输的项目。利用1)光漂白后表面荧光恢复、2)表面准弹性光散射和3)电毛细波衍射等界面动力学技术，结合中子反射率和椭圆偏振光谱界面静态技术，研究人员将研究(1)聚合物在空气/水(A/W)和油/水(O/W)界面上的横向扩散；(2)A/W和空气/聚合物界面的聚合物单层粘弹性；(3)聚合物界面及共聚物作为表面活性剂的作用；(4)利用电场调制强迫瑞利散射技术将链扩散研究扩展到聚电解质的电泳层。

Interfacial phenomena have become a frontier in polymer science, and much excitement is being generated in a wide variety of the areas dealing with molecular organization and self-assembly of surface-active polymers, forces between surfaces with adsorbed polymer chains, interface-mediated chain conformations and polymer- segment density profiles at interfaces. This is a project directed at the polymer-chain transport on monolayers at the interfaces of air/water and oil/water and toward such interfaces. With the interfacial dynamic techniques of 1) surface-fluorescence recovery after photobleaching, 2) surface quasielastic light scattering, and 3) electrocapillary-wave diffraction in conjunction with the interfacial static techniques of neutron reflectivity and spectroscopic ellipsometry, the investigators will examine (1) polymer lateral diffusion on the interface of air/water (A/W) and oil/water (O/W); (2) polymer monolayer viscoelasticity at A/W and at air/polymer interface; (3) polymeric interfaces and effect of copolymers as the surfactants; and (4) extend chain diffusion studies to electrophoresis of polyelectrolytes with the technique of electric-field-modulated Forced Rayleigh Scattering.