丙烯酰胺-马来酸酐共聚合物膜及其对CO2、CH4吸附性能研究

通过自由基聚合制备了丙烯酰胺(AM)和马来酸酐(MA)共聚合物.粘度法测定了聚合物的相对分子量,元素分析法和FTIR等分析表征了共聚物的化学结构,此外研究了共聚合物对CO2和CH4的溶胀吸附性能.在本实验条件下,共聚物的相对分子量、共聚物中两种单体的摩尔数之比m/n、对CO2的平衡吸附量等随聚合过程中单体配比AM/MA的增加而增大;共聚合物的相对分子量在7～17万之间,共聚物中两种单体的摩尔数之比在5～30之间,对CO2的平衡吸附量在45～70mg(CO2)· (g(干膜)) -1之间;而共聚物对CH4的平衡吸附量仅为4mg(CH4)·( g(干膜))-1左右,且不随单体配比AM/MA的增加而变化,这表明丙烯酰胺和马来酸酐共聚合物作为CO2/CH4分离用膜材料,具有较好的CO2优先选择吸附性能.

Study on Poly(AM-MA) Membrane and its Sorption Behavior of CO2 and CH4

The Poly(AM-MA) copolymer was synthesized through radical polymerization of acrylamide(AM) with maleic acid anhydride(MA). The relative molecular weight of copolymer was measured by viscosity method. The chemical structure of the copolymer was analyzed by element analysis and FTIR, CO2 and CH4 sorption behavior of copolymer was investigated by quartz spring weighing-in method . The results show that the relative molecular weight of copolymer, the molar ratio of monomer in copolymer (m/n), CO2 saturated sorption capacity of copolymer increase with increasing of monomer ratio(AM/MA) used for polymerization. The relative molecular weight of copolymer is 70000~170000 and the molar ratio of monomer in copolymer (m/n) is 5~30. CO2 saturated sorption capacity of copolymer is 45~70mg (CO2)? (g(dry membrane) )? 1, but CH4 saturated sorption capacity of copolymer keeps constant with changing of monomer ratio(AM/MA) and is only 4mg(CH4)?(g(dry membrane) ) ?1. It indicates that the Poly(AM-MA) copolymer is a CO2 preferentially selective sorption membrane material for separation of CO2/CH4.