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采用“挤出-拉伸-烧结”法制备了聚四氟乙烯(PTFE)中空纤维膜,通过FESEM、孔径分析仪和压汞仪分别对PTFE中空纤维膜的形貌、孔径和孔隙率进行表征。通过真空膜再生技术对有机胺吸收剂分子结构(氨基上活泼氢原子数,空间位阻效应,羟基基团数和氨基基团数)对CO_2真空膜再生性能的影响进行研究。结果表明:制备的PTFE中空纤维膜具有非对称微孔结构;随着有机胺分子中氨基上活泼氢原子数的增加,CO_2真空膜再生性能下降;随着分子空间位阻效应的增强,CO_2真空膜再生性能提高;当吸收剂分子中羟基基团数和氨基基团数增加时,CO_2真空膜再生性能呈现上升趋势。
Polytetrafluoroethylene (PTFE) hollow fiber membranes were prepared by extrusion-drawing-sintering method. The morphology, pore size and porosity of PTFE hollow fiber membranes were measured by FESEM, pore size analyzer and mercury porosimeter respectively. Characterization. The effects of molecular structure (number of active hydrogen atoms, steric hindrance, number of hydroxyl groups and number of amino groups) on the regeneration performance of CO 2 vacuum membrane were studied by vacuum membrane regeneration technology. The results showed that the prepared PTFE hollow fiber membrane has an asymmetric microporous structure. With the increase of the number of active hydrogen atoms in the amino group of the organic amine molecule, the regeneration performance of the vacuum film of CO 2 decreased. With the increase of the molecular steric hindrance effect, the CO 2 vacuum When the number of hydroxyl groups and the number of amino groups in absorbent molecules increased, the regeneration performance of CO 2 vacuum film showed an upward trend.