The transport properties of CO2 and CH4 for brominated polysulfone membrane
The transport properties of CO2 and CH4 for brominated polysulfone membrane
复制标题
溴化聚砜膜的CO2和CH4传输性能
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
S. Hong
中科院分区：
文献类型：
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作者：
Hyunjoo Kim;S. Hong
测定了合成的溴化聚砜（BPSf）对CO2和CH4的吸附和渗透性能，并与PSf（双酚A聚砜）、MPSf（双酚A甲基化聚砜）和TMSPSf（双酚A三甲基硅烷化聚砜）的吸附和渗透性能进行了比较，探讨了结构与性能的关系。特别地，研究了取代基极性对输运性质的影响。考察了操作压力对聚砜渗透性能的影响。还测量了CO_2和CH_4混合气体的渗透性能，并与纯气体的实验结果进行了比较。吸附浓度和渗透系数与双模式模型拟合良好。二元混合物中每种气体的渗透系数均小于纯气体的渗透系数，且渗透性较差的聚合物渗透系数降低的程度较大。四种聚砜的理想分离因子按以下顺序增加：TMSPSf< PSf< BPSf< MPSf。BPSf的理想分离因子高于具有与BPSf相似的CO2渗透系数的其它聚砜。这可能是由于BPSf中溴的强极性使聚合物的内聚能密度增大，抑制链堆积的能力降低。渗透系数的排序与自由体积分数有很好的相关性。d间距的变化与渗透系数的变化不一致。
The sorption and permeation properties of CO2 and CH4 for synthesized brominated polysulfone, BPSf (bromobisphenol A polysulfone) were measured, and compared with the values for PSf (bisphenol A polysulfone), MPSf (bisphenol A methylated polysulfone) and TMSPSf (bisphenol A trimethylsilylated polysulfone) to investigate the structure-property relationships. Especially, the effect of polarity of substituents on the transport properties was studied. The effect of operating pressure on the permeation properties of polysulfones was examined. The permeation properties for a mixture of CO2 and CH4 were also measured, and these results were compared with those obtained from the experiments of pure gases. The sorbed concentrations and permeability coefficients are well fitted to the dual mode model. The permeability coefficients of each gas of a binary mixture are less than those of pure gases, and the extent of reduction in permeability coefficient is larger for less permeable polymer. The ideal separation factor for four polysulfones increases in the following order: TMSPSf< PSf< BPSf< MPSf. The ideal separation factor for BPSf is higher than other polysulfones having similar permeability coefficients of CO2 with BPSf. It can be explained that the strong polarity of bromine in BPSf increases cohesive energy density of polymer, and reduces the chain packing-inhibiting ability. The ranking of permeability coefficient correlates well with fractional free volume. The variation of d-spacing is not consistent with the permeability coefficient.