改性埃洛石纳米管/Pebax1657杂化膜的制备及其气体分离性能  

Preparation of modified halloysite nanotubes/Pebax1657 hybrid membranes and gas separation performance thereof

作　　者：赵晴 何少剑[2] 林俊[2] 林千果 段晓雅 Zhao Qing;He Shaojian;Lin Jun;Lin Qianguo;Duan Xiaoya(School of Environmental Science and Engineering,North China Electric Power University,Beijing 102206,China;School of Renewable Energy,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学环境科学与工程学院,北京102206 [2]华北电力大学可再生能源学院,北京102206

出　　处：《石油化工》2019年第11期1114-1120,共7页Petrochemical Technology

基　　金：北京市科学技术委员会计划项目(Z181100005118017);国家自然科学基金资助项目(51773058)

摘　　要：以聚多巴胺和聚乙烯亚胺为原料,采用表面涂覆法对埃洛石纳米管(HNTs)进行改性,得到无机填料PDH。再以聚醚共聚酰胺Pebax1657为聚合物基底、PDH为无机填料制备了有机-无机杂化膜,利用SEM,XRD,DSC等方法对膜的结构进行了表征,并考察了膜的机械性能和气体分离性能。实验结果表明,PDH在Pebax1657中分散均匀,且二者相容性较好。PDH与Pebax1657间产生氢键,对分子链运动有一定程度的限制,导致玻璃化转变温度升高,结晶度降低。随PDH含量增加,杂化膜的密度逐渐增加,拉伸强度先增大后减小,断裂伸长率降低,杂化膜的CO2和N2的渗透系数增加,与纯Pebax膜相比,杂化膜的渗透系数和选择性逐渐接近Robeson上界,气体分离性能有所提高。The halloysite nanotubes(HNTs) were modified by surface coating method using polydopamine and polyethyleneimine as raw materials to obtain inorganic filler PDH. The organicinorganic hybrid membrane was prepared by using polyether copolyamide Pebax1657 as polymer substrate and PDH as inorganic filler. The structure of the membrane was characterized by SEM,XRD,DSC,etc. The mechanical properties and gas separation properties of the membranes were tested. The experimental results show that PDH was uniformly dispersed in Pebax1657,and the compatibility between the two was good. The hydrogen bond formed between PDH and Pebax1657 hinders the molecular chain movement and leads to the increase of glass transition temperature and the decrease of crystallinity. With the increase of PDH content,the density of hybrid membrane increased gradually,the tensile strength increased first and then decreased,the elongation at break decreases,the permeability coefficients of CO2 and N2 of hybrid membranes increased. Compared with pure Pebax1657 membrane,the permeability coefficients and selectivity of hybrid membranes gradually approached Robeson upper bound,and the gas separation performance was improved.

关 键 词：聚醚共聚酰胺 Pebax1657 埃洛石纳米管 CO2 捕集 膜分离技术 

分 类 号：TQ028.1[化学工程]