Gas separation properties are reported for self-standing polymer of intrinsic microporosity (PIM) films after addition of palladium (II) acetate or iron (II) acetate by solid state or liquid state mixing. Membranes, with thicknesses in the range 35–55 μm, were prepared from three high molar mass PIMs, two different branched versions of the much-reported PIM-1 (PIM-1a and PIM-1b) and of PIM-Py. Addition of either Fe(OAc)₂ or Pd(OAc)₂ to all three PIMs led to a reduction in permeability and increase in selectivity, but the permeability reduction was much greater for Pd(OAc)₂, which is able to interact with branch points in the PIM and crosslink the polymer. CO₂/CH₄ selectivity of membranes containing Pd(OAc)₂ was poor upon aging, especially after solid state addition to the PIM-1 polymers, for which CO₂ permeabilities dropped to below 200 Barrer after 85 days. Hydrogen permeability and H₂/N₂ selectivity of membranes containing Pd(OAc)₂ did more closely follow conventional permeability/selectivity trade off upon aging. This illustrates the profound differences that can arise in gas permeation properties and aging behaviour from variations in chemical structure and macromolecular characteristics, and from the addition of metal acetates that interact with the polymer in different ways.

通过固态或液态混合添加乙酸钯 (II) 或乙酸铁 (II) 后，报道了固有微孔 (PIM) 薄膜的自支撑聚合物的气体分离性能。厚度在 35-55 μm 范围内的膜是由三种高摩尔质量 PIM 制备的，即备受报道的 PIM-1（PIM-1a 和 PIM-1b）和 PIM-Py 的两种不同分支版本。向所有三种 PIM 中添加 Fe(OAc) ₂或 Pd(OAc) ₂都会导致渗透性降低并提高选择性，但 Pd(OAc) 2 的渗透性降低幅度要大得多，因为 Pd(OAc) ₂能够与支链相互作用PIM 中的点并使聚合物交联。_{含有Pd(OAc) 2}的膜的CO ₂ /CH ₄选择性在老化时较差，特别是在固态添加到PIM-1聚合物后，其CO ₂渗透率在85天后降至200 Barrer以下。含有Pd(OAc) ₂的膜的氢渗透性和H ₂ /N ₂选择性在老化时确实更紧密地遵循传统的渗透性/选择性权衡。这说明了由于化学结构和大分子特性的变化以及添加以不同方式与聚合物相互作用的金属醋酸盐，气体渗透性能和老化行为可能产生的深刻差异。