Synthesis and Gas Separation Properties of Intrinsic Microporosity Polymer PIM-1

摘要

Polymers of intrinsic microporosity (PIMs) possess rigid and highly non-linear molecular structures. The contortion site of PIM-1 is provided by the monomer 5, 5', 6, 6'-tetrahydroxy-3, 3, 3', 3'-tetramethyl-1, 1'-spirobisindane (TTSBI). The paper described the effect of synthetic conditions including catalyst and reaction time on the yield and purity of TTSBI. Then, PIM-1 was synthesized by TTSBI and 2,3,5,6-tetrafluorophthalonitrile in DMF at 60°C for 96h. The chemical structure of TTSBI and PIM-1 was characterized by ~1H NMR and FT-IR. The gas separation properties of PIM-1 treated in different conditions were obtained. The optimized synthetic condition of TTSBI was that hydrochloric acid was chosen as catalyst to react for five hours at 105°C. PIM-1 had good solubility in chloroform. The PIM-1 membranes had good gas permeability coefficients for O_2, N_2, H_2, CH_4 and CO_2. PIM-1 membrane treated by methanol solvent soaked or redissolved in chloroform showed outstanding gas permeability coefficient and a moderate selectivity.