The influence of UV irradiation on gas permeation properties of random segmented poly (imide-siloxane) (PIS) copolymer films was investigated. Random segmented copolymers were synthesized via ester-acid imidization from 4,4'-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) and 3,3′,4,4′-benzophenone tetracarboxylic dianhydride (BTDA) in a 7:3 M ratio with 2,4-diamino mesitylene (DAM) and varying amounts of a diamine terminated polydimethylsiloxane (PDMS) oligomer (M_n = 3000 g/mol). Solvent cast films of these copolymers were UV-irradiated on both sides in air at 365 nm, which induced crosslinking and photooxidation. Pure-gas permeabilities of H₂, O₂, N₂, CH₄, and CO₂ were measured with upstream pressures ranging from 2 to 18 atm at 35 °C. Gas permeability coefficients of a series of PIS copolymers decreased, and selectivity of all gas pairs increased after UV irradiation due to a decrease in free volume by UV crosslinking and photooxidation.

研究了紫外线辐射对无规链段聚（酰亚胺-硅氧烷）（PIS）共聚物薄膜气体渗透性能的影响。通过酯酸酰亚胺化，以7：3 M的比例由4,4'-（六氟异亚丙基）二邻苯二甲酸酐（6FDA）和3,3'，4,4'-二苯甲酮四羧酸二酐（BTDA）合成无规链段共聚物，1,4-二氨基均三甲苯（DAM）和不同量的二胺封端的聚二甲基硅氧烷（PDMS）低聚物（中号_ñ  = 3000克/摩尔）。将这些共聚物的溶剂流延膜在空气中于365 nm的两侧进行UV辐射，从而引起交联和光氧化作用。H ₂，O ₂，N ₂，CH ₄和CO _2的纯气渗透率在35°C下，上游压力为2至18 atm。一系列PIS共聚物的气体渗透系数降低，并且由于紫外线交联和光氧化作用导致自由体积的减少，紫外线照射后所有气体对的选择性均增加。