【摘要】 为了提高CO₂分离膜的性能,将多壁碳纳米管（MWCNTs）添加到天然橡胶（NR）中制备NR/MWCNTs混合基质膜。考察了MWCNTs含量对混合基质膜机械性能的影响,研究了MWCNTs含量、进料气压力和热交联时间对NR/MWCNTs混合基质膜CO₂分离性能的影响,研究了膜的耐老化性能,探讨了混合基质膜的CO₂传递机制。结果表明:随着MWCNTs的增加,混合基质膜的CO₂渗透系数逐渐增加,而CO₂/N₂选择性先增加后减少;当MWCNTs与NR的质量比为2.0%,混合基质膜的气体分离性能达到最优,其CO₂渗透系数和CO₂/N₂选择性分别为138 Barrer和12.5.随着压力的增加,膜的CO₂渗透系数和CO₂/N₂选择性逐渐增加。当热交联时间为24 h,在压力为2 bar下,MWCNTs与NR的质量比为2.0%的NR/MWCNTs混合基质膜的CO₂渗透系数和CO₂/N₂选择性分别为95 Barrer和16.8;且热交联的膜比未交联的混合基质膜具有更优异的耐老化性能,这是因为MWCNTs与NR形成紧密的交联网状结构。更多还原

【Abstract】 In order to improve the performance of CO₂ separation membrane, multi-walled carbon nanotubes（MWCNTs） were added into natural rubber（NR） to prepare NR/MWCNTs mixed matrix membranes（MMMs）. The effect of MWCNTs content on the mechanical properties of mixed matrix membranes was investigated. The effects of MWCNTs content, pressure and thermal cross-linking time on the separation performance of NR/MWCNTs MMMs and the anti-aging properties of the membranes were investigated. The CO₂ transport mechanism of MMMs was also discussed. The results show that the CO₂ permeability of MMMs increased gradually with increasing MWCNTs content, while the CO₂/N₂ selectivity increased firstly and then decreased. The optimal CO₂ permeability and CO₂/N₂ selectivity of NR/MWCNTs MMM containing 2.0% MWCNTs were 138 Barrer and 12.5, respectively. Furthermore, the CO₂ permeability and CO₂/N₂ selectivity of membrane also increased with increasing pressure. When the thermal cross-linking time was 24 h, the membrane containing 2.0% MWCNTs exhibited optimal separation performance with a CO₂ permeability of 95 Barrer and a CO₂/N₂ selectivity of 16.8 at 2 bar. Besides, the thermally cross-linked membrane had better anti-aging properties than uncross-linked mixed matrix membrane owing to dense network structure between MWCNTs and NR.更多还原