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Gas permselectivity properties of high free volume polymers modified by a low molecular weight additive

机译:低分子量添加剂改性的高自由体积聚合物的气体渗透性

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The permselectivity properties of mixtures of the highly substituted polymers tetramethylhexafluoro polysulfone (TMHFPSF) and tetramethylhexafluoro bisphenol A t-butyl isophthalate (TMHFBPA-tBIA) with a low molecular weight glassy additive Kenflex A (denoted here as KXA) were measured for different gases and compared with the permselectivity properties shown by the base, unsubstituted polymers polysulfone (PSF) and bisphenol A t-butyl isophthalate (BPA-tBIA). The results show that the selectivity-permeability balance of polymer membranes may be appropriately tailored by a combination of chemical and physical alterations of the base polymer. The addition of modest amounts of KXA (ca. 20 wt %) into TMHFPSF or TMHFBPA-tBIA leads to materials whose permeability/selectivity combination is better than that of the unsubstituted materials, PSF or BPA-tBIA. The polymer TMHFPSF responds more beneficially to the incorporation of KXA than TMHFBPA-tBIA. At the same level of permeability, mixtures based on TMHFPSF have higher selectivity factors for H-2/CH4 and CO2/CH4 than those based on TMHFBPA-tBIA. (C) 1998 John Wiley & Sons, Inc. [References: 32]
机译:测量了高度取代的聚合物四甲基六氟聚砜(TMHFPSF)和四甲基六氟双酚A间苯二甲酸叔丁酯(TMHFBPA-tBIA)与低分子量玻璃状添加剂Kenflex A(在此表示为KXA)的混合物的渗透选择性特性,并进行了比较碱表现出的渗透选择性,未取代的聚合物聚砜(PSF)和双酚A间苯二甲酸正丁酯(BPA-tBIA)。结果表明,可以通过基础聚合物的化学和物理改变的组合来适当地调整聚合物膜的选择性-渗透性平衡。向TMHFPSF或TMHFBPA-tBIA中添加适量的KXA(约20 wt%)会导致其渗透性/选择性组合比未取代的PSF或BPA-tBIA更好。与TMHFBPA-tBIA相比,聚合物TMHFPSF对KXA的结合更有利。在相同的渗透率水平下,与基于TMHFBPA-tBIA的混合物相比,基于TMHFPSF的混合物对H-2 / CH4和CO2 / CH4的选择性更高。 (C)1998 John Wiley&Sons,Inc. [参考:32]

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