Abstract: Polyvinylpyrrolidone was synthesized by radical polymerization.Poly(N-vinyl-γ-sodium aminobutyrate) containing secondary amine and carboxyl groups which can react reversibly with CO₂ was obtained through the hydrolysis of polyvinylpyrrolidone. A new facilitated transport composite membrane for CO₂ separation was prepared with the hydrolysate as the top layer material and microporous membrane as the support. The interactions of CO₂, CH₄, water, low-molecular-mass impurities in the membrane and support membranes were studied and the influences of the interactions on the membrane structure and performance were also investigated. Water was not only a carrier but also a plasticizer.The coupling between CO₂ and CH₄ affected their permeability.The presence of low-molecular-mass impurities in the membrane could alter the membrane structure and performance.The material and pore diameter of the support membrane affected the composite membrane performance.

摘要： 采用自由基聚合合成了聚乙烯基吡咯烷酮，经水解得到了聚N-乙烯基-γ氨基丁酸钠(PVSA).该聚合物含有能与CO₂进行可逆反应的仲胺基和羧基.以PVSA为表层，以微孔膜为支撑体，制备了新型CO₂固定载体复合膜.以CO₂/CH₄体系为分离对象，研究了CO₂、CH₄、PVSA、水、膜中小分子杂质和支撑膜等相互之间的作用，同时探讨了这些相互作用对膜结构和性能的影响.