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首页> 外文期刊>Journal of Applied Polymer Science >Effect of solvent on properties of solution-cast dense SPPO films
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Effect of solvent on properties of solution-cast dense SPPO films

机译：溶剂对溶液浇铸致密SPPO薄膜性能的影响

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The effect of solvent on properties of solution-cast dense films was investigated using high molecular weight sulfonated poly(2,6-dimethyl-1,4-phenylene oxide) (SPPO) and five different solvents having relatively similar molar volumes. The study revealed that polymer-solvent interactions existing in casting solution primarily determine the concentration of residual solvent and surface morphology of the films. On the other hand, the O-2 and CO2 permeabilities, which for most permeable films were more than three times greater than for the least permeable ones, appear to be governed by the volatility of solvent in casting solution. At the same time, the more permeable films showed lower O-2/N-2 and CO2/CH4 permeability ratios than the less permeable ones. In addition to physical factors such as poly- mer-solvent interactions and volatility of solvent in casting solution, the differences in gas transport properties of SPPO films could arise from the formation of quaternary salts-in particular, in the case of films prepared from the pyridine solution. The analysis of casting solution properties, surface images by atomic force microscopy, and gas transport properties allowed us to associate defective structures of some SPPO films with a specific surface morphology and a particular combination of solvent properties. (C) 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 1100-1110, 2003. [References: 44]
机译：使用高分子量磺化聚（2,6-二甲基-1,4-苯撑氧）（SPPO）和具有相对相似摩尔体积的五种不同溶剂，研究了溶剂对溶液流延致密膜性能的影响。研究表明，流延溶液中存在的聚合物-溶剂相互作用主要决定了残留溶剂的浓度和薄膜的表面形态。另一方面，对于大多数可渗透膜，O-2和CO2的渗透率是渗透率最低的膜的O-2和CO2渗透率的三倍以上，这似乎受浇铸溶液中溶剂挥发性的控制。同时，渗透性更高的薄膜与渗透性较差的薄膜相比，其O-2 / N-2和CO2 / CH4的渗透率更低。除了物理因素（例如聚合物与溶剂的相互作用和流延溶液中溶剂的挥发性）外，SPPO膜气体传输性能的差异还可能由季盐的形成而引起，尤其是在由季铵盐制备的情况下。吡啶溶液。对流延溶液性能，原子力显微镜观察的表面图像以及气体传输性能的分析使我们能够将某些SPPO膜的缺陷结构与特定的表面形态和溶剂性能的特定组合联系起来。 （C）2003 Wiley Periodicals，Inc. J Appl Polym Sci 88：1100-1110，2003。[参考：44]

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