甲基丙烯酸二甲氨基乙酯-丙烯腈共聚物膜的制备及其气体渗透性能

Copolymer membrane preparation of 2-(N,N-dimethyl aminoethylme) and acrylonitrile and its gas permeance performance

采用水溶液沉淀法合成了甲基丙烯酸二甲氨基乙酯(DM)和丙烯腈(AN)的共聚物,用红外光谱、黏度法和X射线衍射分析了聚合物的结构.实验考察了反应条件对共聚物结构的影响.在此基础上,通过溶液浇注法制备了甲基丙烯酸二甲氨基乙酯(DM)和丙烯腈(AN)的共聚物膜,研究了聚合物膜的CO2、CH4渗透性能.结果表明,由于共聚物中含有能与CO2进行可逆反应的叔胺基,共聚物膜表现出较好的CO2渗透性和CO2/CH4选择性,如在25℃、压力为1140Pa时,CO2的渗透速率可达3.53×10-12cm3(STP).cm-2.s-1.Pa-1,CO2/CH4的理想分离因子达到104.5.利用膜吸附CO2和CH4后红外光谱的变化,分析了膜对CO2的促进传递机理.

Poly（DM-co-AN） was synthesized by the usual radical polymerization of 2 （N, N dimethyl aminoethyl methacrylate） and acrylonitrile. The chemical structure of the poly （DM-co-AN） was analyzed by viscosity measurement, elemental analysis , infrared spectrum （FTIR） and X-ray diffraction （XRD）. The effect of reaction condition on chemical structure and the effects of carrier content, gas feed pressure and temperature on permeability of the facilitated transport membrane were investigated. The results showed that the membrane displayed a CO2 permeation rate of 3.53×10^-12 cm^3 （STP）·cm^-2·s^-1· Pa^-1 and CO2/CH4 ideal selectivity of 104.5 at 25℃, 1140 Pa of gas pressure. Both CO2 permeation rate and selectivity of CO2/CH4 decreased with increasing pressure on feed gas. The facilitated transport mechanism of CO2 in membrane was analyzed by the infrared spectra of the membranes in different states,