A technique for condensed structures of polymer blends at two dimensional space

在本研究中，我们建立了一个结合椭圆偏振仪、荧光显微镜和表面天平的仪器来研究聚合物共混膜的聚集结构。得到以下结果.以N-（5-荧光硫代氨基甲酰基）-二棕榈酰-L-α-磷脂酰乙醇胺（N-（5-fluoreseinthiocarbonoyl）-dipalmytoyl-L-alpha-phosphatidylethanolamine，简称N-PE）为荧光探针，固相相容，液相不相容。将二月桂酰磷脂酰胆碱（DLPC）和甜菜碱-PE以25：1的重量比混合并溶解在氯仿中以制备铺展溶液。在显微镜下观察到DPPE在气液共存时存在与气相相当的圆形暗区;对于DPPE与十五烷酸的不同混合物，在相同的甜菜碱-PE质量比下，随着十五烷酸含量的增加，暗区逐渐变形并被破坏，最终出现新的白色区并生长.用椭圆偏振法和表面平衡法研究了两种聚合物共混物，如二棕榈酰磷脂酰胆碱（DPPC）-聚-γ-甲基-L-谷氨酸盐（PMLG）混合物和DPPC-聚（4-乙烯基-N-正己基溴化吡啶）（PVPy）混合物。DPPC-PMLG混合物是相容的，而DPPC-PVPy混合物是不相容的，并且测得它们的层厚度为2-3 nm。

In this study, we built up an instrument to investigate the aggregated structures of polymer blend films in a combination of ellipsometer, fluorescence microscopy, and surface balance. The following results were obtained.1. N-(5-fluoreseinthiocarbamoyl)-dipalmytoyl-L-alpha-phosphatidyl ethanol amine (Fluoresceine-PE) was used as a fluorescent probe, which compatible in solid phase and incompatible in liquid phase. Dilauroylphosphatidylcholine (DLPC) and Fluoresceine-PE were mixed in a 25 : 1 weight ratio and dissolved in chloroform to prepare spreading solution. From the microscope observation, there are some circular dark domains, which are equivalent with the gas phase in the coexistence of gas to liquid phases of DPPE.For various mixtures of DPPE and pentadecanoic acid together with the same weight ratio of Fluoresceine-PE, the dark domains were gradually deformed with an increase in pentadecanoic acid content and disrupted, and finally new white domains were appeared and became growth.2. Both polymer blends, such as dipalmytoyl phosphatidyl choline (DPPC) -poly-gamma-methyl-L-glutamate(PMLG) mixture and DPPC-poly(4-vinyl-N-n-hexylpyridinium bromide (PVPy) mixture were studied by ellipsometry and surface balance. The DPPC-PMLG mixtures were compatible and the DPPC-PVPy ones were incompatible and their layr thicknesses were measured to be 2-3 nm.