SYNTHESIS OF POLYALKYLENEBENZIMIDAZOLE AND THEIR GAS PERMEABILITY
含脂肪链聚苯并咪唑的合成及其气体透过性能

series of polyalkylenebenzimidazole were synthesized by solution polycondensation and polymeric membranes were cast from formic acid solution at low pressure and room temperature. The relationship between gas permselectivity and chemical structure of polyalkylenebenzimidazole was discussed.It was found that the permeability order of hydrogen;carbon dioxide;oxygen;nitrogen;and methane is fit for ordinary glass polymers.The polymers that have longer flexible polymeric chain have higher gas permeability,but lower selectivity than the polymer that have shorter flexible chain.Gas permeability will increase if a flexible group is introduced into rigid chain.Gas permeability rises and selectivity reduces if temperature of transport gas increases.It reveals that the gas permeability will rise,if flexible segment is introduced in to rigid backbone for some aromatic polymers.