负载型聚酰亚胺-二氧化硅-银杂化膜的制备和表征

采用溶胶凝胶法制备了硅藻莫来石负载的SiO2(SiO2KM)负载的聚酰亚胺二氧化硅银杂化膜,采用IR、TGA、SEM、XRD、氮吸附、气体渗透性能测量等方法对膜的性能进行了表征.银的加入使杂化溶胶的粘度增大,膜孔径增大,孔径分布弥散;二氧化硅在杂化膜中以无定型存在,银以氯化银的形式存在;Ag+和聚酰亚胺中的氮以配位键络合在一起,丙烯通过双键吸附在Ag+上;杂化膜热稳定性随二氧化硅的加入而增加,随银的加入而降低.丙烯丙烷在杂化膜上的分离因子为3.54～4.1,银的加入对丙烯的传输有明显的促进作用.

PREPARATION AND CHARACTERIZATION OF SUPPORTED POLYIMIDE-SILICA-SILVER HYBRID MEMBRANES

The polyimide-silica-silver hybrid membranes supported on SiO_2/K-M were prepared by sol-gel route and characterized by means of IR,TGA,SEM,XRD,N_2 adsor ption and gas permeability measurements.The results show that the viscosity of hybrid sols and the pore size of hybrid membranes are increased and the pore size distribution is dispersed by the addition of silver nitrate.Silica and silver existed as amorphism and silver chloride in hybrid membranes,respectively.Silver is bonded with nitrogen in polyimide and propylene is adsorbed on silver by double bond.The thermal decomposing temperature of hybrid membranes is increased by addition of silica and reduced with increase of silver amount.The separation factors of propylene/propane through the hybrid membrane are 3.54～4.1. The obvious facilitated transport of propylene is realized by the addition of silver.