Structure and gas transport characteristics of triethylene oxide‐grafted polystyrene‐b‐poly(ethylene‐co‐butylene)‐b‐polystyrene,Journal of Polymer Science

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Structure and gas transport characteristics of triethylene oxide‐grafted polystyrene‐b‐poly(ethylene‐co‐butylene)‐b‐polystyrene
Journal of Polymer Science ( IF 3.9 ) Pub Date : 2020-08-01 , DOI: 10.1002/pol.20200232
Ding Tian ₁ , Taliehsadat Alebrahim ₂ , Gregory K. Kline ₁ , Liwen Chen ₃ , Haiqing Lin ₂ , Chulsung Bae _{1,

3}

Affiliation

Polymeric membrane‐based gas separation technology has significant advantages compared with traditional amine‐based CO₂ separation method. In this work, SEBS block copolymer is used as a polymer matrix to incorporate triethylene oxide (TEO) functionality. The short ethylene oxide segment is chosen to avoid crystallization, which is confirmed by differential scanning calorimetry and wide‐angle X‐ray scattering characterizations. The gas permeability results reveal that CO₂/N₂ selectivity increased with increasing content of TEO functional group. The highest CO₂ permeability (281 Barrer) and CO₂/N₂ selectivity (31) were obtained for the membrane with the highest TEO incorporation (57 mol%). Increasing the TEO content in these copolymers results in an increase in CO₂ solubility and a decrease in C₂H₆ solubility. For example, as the grafted TEO content increased from 0 to 57 mol%, the CO₂ solubility and CO₂/C₂H₆ solubility selectivity increased from 0.72 to 1.3 cm³(STP)/cm³ atm and 0.47 to 1.3 at 35°C, respectively. The polar ether linkage in TEO‐grafted SEBS copolymers exhibits favorable interaction with CO₂ and unfavorable interaction with nonpolar C₂H₆, thus enhancing CO₂/C₂H₆ solubility selectivity.

中文翻译：

三环氧乙烷接枝的聚苯乙烯-b-聚（乙烯-共-丁烯）-b-聚苯乙烯的结构和气体传输特性

与传统的基于胺的CO ₂分离方法相比，基于聚合物膜的气体分离技术具有明显的优势。在这项工作中，将SEBS嵌段共聚物用作聚合物基质，以结合三环氧乙烷（TEO）官能团。选择短的环氧乙烷链段可避免结晶，这已通过差示扫描量热法和广角X射线散射特性得到了证实。气体渗透性结果表明，随着TEO官能团含量的增加，CO ₂ / N ₂选择性增加。最高的CO ₂渗透率（281 Barrer）和CO ₂ / N ₂对于TEO掺入最高（57摩尔％）的膜，获得了选择性（31）。这些共聚物中TEO含量的增加导致CO ₂溶解度增加和C ₂ H ₆溶解度降低。例如，随着接枝的TEO含量从0增加到57摩尔％，CO ₂溶解度和CO ₂ / C ₂ H ₆溶解度选择性从0.72增加到1.3 cm ³（STP）/ cm ³ atm，从35 ℃的0.47增加到1.3分别为℃。TEO接枝SEBS共聚物中的极性醚键与CO ₂表现出良好的相互作用，与非极性C ₂表现出不利的相互作用H ₆，因此提高了CO ₂ / C ₂ H _6的溶解度选择性。

更新日期：2020-09-16

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