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The Transport Properties of CO_2 and CH_4 for Chemically Modified Polysulfones

机译：化学修饰的聚砜的CO_2和CH_4的输运性质

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摘要

The sorption and transport properties of pure CO_2 and CH_4 for a series of polysulfones were measured. The effects of molecular structure of polysulfones on transport properties were studied using chemically modifed polysulofnes, including TMSPSF (bisphenol-A trimethylsilylated polysulfone), BPSF (bromobisphenol-A polysulfone), and BTMSPSF (bromobisphenol-A trimethylsilylated polysulfone). The effects of operating pressure on the sorption and permeation proeperties of polysulfones were exained. The permeation properties for a mixture of CO_2 and CH_4 were also measured and these results were compared with those obtaiend from the experiments of pure gases. The sorbed concentrations and permeability coefficients are well fitted to a conventional dual-mode model. The permeability coefficients of each gas of a binary mixture are lower than those of pure gases, which shows the competition effect between each component. The permeability coefficients of polysulfones rank in the following order, TMSPSF > BTMSPSF > bisphenol-A polysulfone (PSF) > BPSF. The effect of the substituents on chain packing was related to the gas-permetaion properties. Fractional free volume (FFV) calculations and X-ray diffraction were used to judge chain packing. In comparison with PSF, the higher values of permeability coefficients for TMSPSF and BTMSPSF are due to higher FFV and d spacing. The lower permeability coefficients for BPSF is attributed ot the storng induced dipole interchain interaction. Addition of bromo substituents to TMSPSF is also found to decrease the permeability coefficients for BTMSPSF, suggesting that the potential increase in FFV due to packing-disrupting bulky trimethylsilyl groups is overridden by the increase in cohesive energy density.
机译：测量了纯CO_2和CH_4对一系列聚砜的吸附和传输性能。使用化学改性的聚砜，包括TMSPSF（双酚A三甲基甲硅烷基化聚砜），BPSF（溴双酚A型聚砜）和BTMSPSF（溴双酚A三甲基硅烷化聚砜），研究了聚砜分子结构对输运性能的影响。考察了操作压力对聚砜吸附和渗透性能的影响。还测量了CO_2和CH_4混合物的渗透性能，并将这些结果与纯气体实验获得的结果进行了比较。吸附的浓度和渗透系数非常适合常规双模模型。二元混合物中每种气体的渗透系数都比纯气体低，这表明每种组分之间的竞争效应。聚砜的渗透系数按以下顺序排列：TMSPSF> BTMSPSF>双酚A聚砜（PSF）> BPSF。取代基对链堆积的影响与气体渗透性能有关。分数自由体积（FFV）计算和X射线衍射用于判断链堆积。与PSF相比，TMSPSF和BTMSPSF的渗透系数较高是因为FFV和d间距较高。 BPSF较低的渗透系数归因于存储引起的偶极链间相互作用。还发现向TMSPSF中添加溴取代基会降低BTMSPSF的渗透系数，这表明由于破坏包装能量的笨重三甲基甲硅烷基基团引起的FFV潜在增加被内聚能密度的增加所取代。

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