复合膜一般由不对称多孔支撑层上复合超薄功能层而成,复合膜的性能和与渗透组分直接相接触的超薄功能层的理化性质有着密切的关系,超薄功能层/多孔支撑层界面的物理化学性质对复合膜分离性能的影响也不可忽视,实验表明,界面层的化学组成与结构.极性强弱、荷电性、形态分布、界面结合能对复合膜的性能有较大影响.超薄功能层的化学组成直接影响着复合膜的性能,它一般只有几十个纳米,超薄功能层/多孔支撑层之间的界面层的化学组成间接影响复合膜的性能,如反渗透复合膜的该界面引入极性基因如磺酸基有利于提高水通量;在气体分离用复合膜中,结合待分离气体的理化性 The composite membrane is generally composed of an ultra-thin functional layer on an asymmetric porous support layer. The properties of the composite membrane are closely related to the physical and chemical properties of the ultra-thin functional layer directly contacting the permeable component. The ultra-thin functional layer / porous support The influence of the physical and chemical properties of the layer interface on the separation performance of the composite membrane can not be neglected. Experiments show that the chemical composition and structure of the interface layer are polar, weak, charged, morphological, and interfacial bonding. The influence of the chemical composition of the ultra-thin functional layer directly affects the performance of the composite film, it is generally only a few dozen nanometers, the chemical composition of the interface layer between the ultra-thin functional layer / porous support layer indirectly affect the performance of the composite film, Reverse osmosis composite membrane at the interface of the introduction of polar genes such as sulfonic acid group is conducive to improving water flux; gas separation composite membrane, combined with the physicochemical properties of the gas to be separated