摘要
选取聚二甲基硅氧烷(PDMS)和聚{3-[(2-氨乙基)氨基]丙基}甲基(二甲基)硅氧烷(NH_(2)-PDMS)两种不同的硅橡胶材料分别与1,4-双(三乙氧基硅基)苯(BTESB)交联,制备铸膜液,采用刮涂法将铸膜液刮涂于聚丙烯腈(PAN)支撑体上制备成膜,并将其应用于气体分离。探究硅橡胶材料种类和铸膜液质量分数对膜分离性能的影响;通过金属掺杂对NH_(2)-PDMS进行改性研究,探究不同金属元素对材料结构及膜性能的影响。结果表明,相同质量分数下,NH_(2)-PDMS膜表现出更大的CO_(2)渗透速率;随着铸膜液质量分数的降低,NH_(2)-PDMS膜的CO_(2)渗透速率逐渐升高;随着金属元素的加入,改性NH_(2)-PDMS膜的CO_(2)渗透速率均增大。当NH_(2)-PDMS铸膜液质量分数为1.0%、加入金属Co时,膜的分离性能最佳,此时CO_(2)的渗透速率达到3.71×10^(-6) mol/(m^(2)·s·Pa),CO_(2)/N_(2)选择性为11。
Two distinct silicone rubber materials,namely polydimethylsiloxane(PDMS)and poly[3-((2-aminoethyl)amino)propyl]methyl(dimethyl)siloxane(NH_(2)-PDMS),are individually cross-linked with 1,4-bis(triethoxysilyl)benzene(BTESB)to obtain two kinds of cross-linked casting solution.The casting solution is then applied onto a polyacrylonitrile(PAN)support via a knife coating method to fabricate the membrane that is subsequently employed in gas separation.The impacts of silicone rubber material types and casting solution concentration on separation performance of the membrane are explored.Simultaneously,NH_(2)-PDMS is modified through metal doping,and the influence law of different metals on the structure of NH_(2)-PDMS and the performance of the membrane is investigated.Experimental results indicate that NH_(2)-PDMS membrane exhibits a greater CO_(2) permeance under identical experimental conditions.As the concentration of the casting solution decreases,the CO_(2) permeance of NH_(2)-PDMS membrane increases gradually.With the addition of metals,the CO_(2) permeance of modified NH_(2)-PDMS membrane increases.In conclusion,the membrane prepared at a NH_(2)-PDMS casting solution concentration of 1.0%and a Co modification presents the best separation performance,delivering a CO_(2) permeance of 3.71×10^(-6) mol/(m^(2)·s·Pa)and a CO_(2)/N_(2)selectivity of 11.
作者
张莹
郭猛
潘阳
任秀秀
钟璟
ZHANG Ying;GUO Meng;PAN Yang;REN Xiu-xiu;ZHONG Jing(School of Petrochemical Engineering,Changzhou University,Changzhou 213164,China)
出处
《现代化工》
北大核心
2025年第9期189-195,共7页
Modern Chemical Industry
基金
中国石油化工股份有限公司科技部委托项目(223155)。
关键词
金属离子改性
氨基
硅橡胶膜
气体分离性能
metal ion modification
amino group
silicone rubber membrane
gas separation performance
