Solid-state facilitated, olefin transport membranes were prepared by complexation of poly(styrene-b-isoprene-b-styrene) (SIS) block copolymer and silver salt. Facilitated olefin transport was not observed up to a silver mole fraction of 0.14, representing a threshold concentration, above which transport increased almost linearly with increasing silver salt concentration. This was because firstly the silver ions were selectively coordinated with the C=C bonds of PI blocks up to a silver mole fraction of 0.20, and secondly the coordinative interaction of the silver ions with the aliphatic C=C bond was stronger than that with the aromatic C=C bond, as confirmed by FT-Raman spectroscopy. Small angle X-ray scattering (SAXS) analysis showed that the cylindrical morphology of the neat SIS block copolymer was changed to a disordered structure at low silver concentrations (0.01∼0.02). However, at intermediate silver concentrations (0.15∼0.20), disordered-ordered structural changes occurred and finally returned to a disordered structure again at higher silver concentrations (>0.33). These results demonstrated that the facilitated olefin transport of SIS/silver salt complex membranes was significantly affected by their coordinative interactions and nano-structural morphology.

中文翻译：

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聚（苯乙烯-b-异戊二烯-b-苯乙烯）/银盐配合物促进的运输膜的烯烃分离性能和配位行为

通过聚（苯乙烯-b-异戊二烯-b）的络合制备固态促进的烯烃传输膜-苯乙烯）（SIS）嵌段共聚物和银盐。直到达到0.14的银摩尔分数（代表阈值浓度），都没有观察到促进的烯烃传输，在该摩尔分数以上，传输随着银盐浓度的增加几乎线性地增加。这是因为：首先，银离子与PI嵌段的C = C键选择性地配位，直至银的摩尔分数为0.20，其次，银离子与脂族C = C键的配位相互作用要强于与如FT-拉曼光谱法所证实的，芳族C ＝ C键。小角X射线散射（SAXS）分析表明，在低银浓度（0.01〜0.02）下，纯净的SIS嵌段共聚物的圆柱形态变为无序结构。但是，在中等银浓度（0.15〜0.20）下，发生无序有序的结构变化，并最终在较高的银浓度（> 0.33）下再次返回到无序结构。这些结果表明，SIS /银盐复合膜的便利烯烃传输受到其配位相互作用和纳米结构形态的显着影响。