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首页> 外文期刊>Journal of Applied Polymer Science >Incorporation of Fluorinated Surfactants into Polysulfone Films and Asymmetric Gas Separation Membranes
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Incorporation of Fluorinated Surfactants into Polysulfone Films and Asymmetric Gas Separation Membranes

机译：将氟化表面活性剂掺入聚砜膜和不对称气体分离膜中

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This study investigated the effect of incorporating strong surfactants into hollow fiber membranes and solution cast films made from polysulfone (PSF).During membrane formation,various (mostly fluorinated) surfactants were added to the spin-ning solution,quench medium,and bore fluid.Both the gas transport properties and the membrane structure were affected.Some membranes showed a modest increase in selectivity or in permeation rate.At low concentrations the addition of perfluoro ammonium octanoate (PAO) increased the O_2 permeation rate by 44% with only a small loss of selectivity.Surfactants were also incorporated into dense PSF films by solution casting.Only pure PSF films and those with low concentrations of short-tailed fluori-nated surfactants were clear and transparent;higher concentrations and other surfac-tants yielded cloudy or defective films.The presence of surfactanst decreased the glass transition temperature of PSF to varying extents.Increased total and polar surface free energy correlated with changes in the gas transport properties.It is proposed that the surfactants interact with the polymer both during membrane and film formation,and also affect chain packing after the solvent has been removed.SEM images confirmed that membranes with surfactants have larger voids in the porous matrix of the men-brane.
机译：这项研究研究了将强表面活性剂掺入中空纤维膜和聚砜（PSF）制成的溶液流延膜中的效果。在膜形成过程中，向纺丝溶液，淬火介质和钻孔液中添加了各种（大部分为氟化的）表面活性剂。气体的传输特性和膜结构都受到影响，某些膜的选择性或渗透率略有增加，在低浓度下，全氟辛酸铵（PAO）的加入使O_2的渗透率增加了44％，损失很小还通过溶液流延将表面活性剂掺入致密的PSF膜中，只有纯PSF膜和低浓度短尾氟化表面活性剂的膜才是透明的;高浓度和其他表面活性剂会产生浑浊或有缺陷的膜。表面活性剂的存在在不同程度上降低了PSF的玻璃化转变温度。认为表面活性剂在膜和膜的形成过程中都与聚合物发生相互作用，并且在去除溶剂后也影响链的堆积.SEM图像证实具有表面活性剂的膜在膜中具有较大的空隙脑膜的多孔基质。

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