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首页> 外文期刊>Journal of Applied Polymer Science >Influence of novel surface modifying macromolecules and coagulation media on the gas permeation properties of different polymeric gas separation membranes
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Influence of novel surface modifying macromolecules and coagulation media on the gas permeation properties of different polymeric gas separation membranes

机译：新型表面改性大分子和凝聚介质对不同聚合物气体分离膜气体渗透性能的影响

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摘要

Integrally skinned asymmetric membranes for the separation of O _2 and N _2 were fabricated by the phase inversion technique from polysulfone, polyetherimide, and polyimide. Two types of surface modifying macromolecules (SMMs) including hydrophilic SMM (LSMM) and charged SMM (cSMM) were synthesized and blended with the casting solution to modify the membrane surface. The cast film was then immersed in the first coagulant alcohol (methanol, ethanol, or isopropanol) for a predetermined period, before being immersed in the second coagulant (water). The SMMs used in these experiments were laboratory synthesized by the two-step process of polyurethane prepolymer synthesis and end capping, before being characterized by differential scanning calorimetry. Their molecular structure was determined from the molecular weight obtained by gel permeation chromatography. The membranes were characterized by contact angle measurement and O _2 and N _2 gas permeation performance. Attempts were made to interpret the gas permeation data by delayed demixing affected by solubility parameters of polymer, solvent, and nonsolvent. Furthermore, the permeation performance of cSMM membranes was interpreted by the solvation of the charged sulfonate groups present in cSMM.
机译：通过相转化技术，由聚砜，聚醚酰亚胺和聚酰亚胺制备了用于分离O _2和N _2的整体表皮不对称膜。合成了两种类型的表面改性大分子（SMM），包括亲水性SMM（LSMM）和带电SMM（cSMM），并与流延溶液共混以改性膜表面。然后将流延膜浸入第一凝结剂醇（甲醇，乙醇或异丙醇）中预定的时间，然后浸入第二凝结剂（水）中。这些实验中使用的SMM是通过聚氨酯预聚物合成和封端的两步过程实验室合成的，然后通过差示扫描量热法进行表征。由通过凝胶渗透色谱法获得的分子量确定其分子结构。通过接触角测量以及O _2和N _2气体渗透性能来表征膜。尝试通过受聚合物，溶剂和非溶剂的溶解度参数影响的延迟混合来解释气体渗透数据。此外，cSMM膜的渗透性能可以通过cSMM中存在的带电磺酸盐基团的溶剂化来解释。

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