Poly(styrene-b-butadiene-b-styrene) (SBS) block copolymer has been recently demonstrated to be a polymer membrane material with high selectivity for CH₄/N₂ gas separation. In this study, two effective approaches of grafting and crosslinking have been explored to improve the gas permeability of SBS polymer by introducing polysiloxane (silicone) polymers to SBS backbone via hydrosilylation reaction. First, a series of novel poly(styrene-b-butadiene-b-styrene)-g-poly(dimethylsiloxane) (SBS-g-PDMS) graft copolymers were synthesized via the hydrosilylation reaction of SBS carbon double bonds and silanes (Si-H) from monohydride terminated PDMS. We found that CH₄ permeability was increased 40% by grafting only 1.24% PDMS in SBS. Second, to supplement additional silicone to SBS, the hydrosilylation reaction of SBS carbon double bonds and silanes from poly(methylhydrosiloxane) was used to prepare novel SBS-silicone cross-linked polymer membranes. It was demonstrated that CH₄ permeability could be improved by 214%, achieving 118 Barrer when 45 wt% silicone was incorporated in SBS. This successful example of improving gas permeation by molecular design could open up new avenues for researchers to develop future polymer membranes with both high selectivity and permeability for industrial applications including methane enrichment from coalbed gases.

聚（苯乙烯-b-丁二烯-b-苯乙烯）（SBS）嵌段共聚物最近被证明是对CH ₄ / N ₂气体分离具有高选择性的聚合物膜材料。在这项研究中，已经探索了两种有效的接枝和交联方法，以通过氢化硅烷化反应将聚硅氧烷（有机硅）聚合物引入SBS骨架，从而提高SBS聚合物的透气性。首先，一系列新的聚（苯乙烯-b-丁二烯-b-苯乙烯）-g-聚（二甲基硅氧烷）（SBS- g-PDMS）接枝共聚物是由SBS碳双键和硅烷（Si-H）的氢化硅烷化反应由一元氢化的PDMS合成的。我们发现通过在SBS中仅接枝1.24％PDMS ，CH _4的渗透性增加了40％。其次，为了向SBS补充其他有机硅，使用SBS碳双键和来自聚（甲基氢硅氧烷）的硅烷进行的硅烷化反应来制备新型SBS-有机硅交联的聚合物膜。证明CH ₄当SBS中掺入45 wt％的有机硅时，渗透率可提高214％，达到118 Barrer。通过分子设计改善气体渗透的成功实例，可以为研究人员开发具有高选择性和渗透性的未来聚合物膜提供新的途径，以用于工业应用，包括从煤层气中富集甲烷。