초록

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Abstract ▼ AI-Helper

The polyamic acid (PAA) based on 3,3', 4,4'-benzophenonetetracarboxylic dianhydride(BTDA)-3,3', 4,4'-dipheylsulfonetetracarboxylic dianhydride(BAPP), 2,2-bis(4-[4-aminophenoxyl]phenyl) propane(DSDA)-3,3', 4,4'-dipheylsulfonetetracarboxylic dianhydride(BAPP), and 3,3',4,4'-benzophenonetetracarboxylic...

The polyamic acid (PAA) based on 3,3', 4,4'-benzophenonetetracarboxylic dianhydride(BTDA)-3,3', 4,4'-dipheylsulfonetetracarboxylic dianhydride(BAPP), 2,2-bis(4-[4-aminophenoxyl]phenyl) propane(DSDA)-3,3', 4,4'-dipheylsulfonetetracarboxylic dianhydride(BAPP), and 3,3',4,4'-benzophenonetetracarboxylic dianhydride(BTDA)-4,4'-oxydianiline(4,4'-ODA) was synthesised. The casted PAA films were partially imidised and the permeation properties of these PAA films for $O_2$ and $N_2$ were investigated according to the degree of imidisation. When the degree of imidisation was increased by curing, the permeabilities of the PAA films were increased for a while and then decreased. These results show that the increase of gas permeation by the disappearence of strong hydrogen bond is larger than the decrease of gas permeation by the dense effect. The decrease of hydrogen bond between molecular chains of PAA suddenly increases the vibration of the chain to make holes but the compaction in polymer chain gradually decreases the gas permeation. The largest values of permeability of BTDA-BAPP, DSDA-BAPP and BTDA-4,4'-ODA film was 8.3, 0.3 and 0.8 barrer respectively, and the imidisation content corresponding to the values of the largest permeability was 37, 47 and 55% each. But the permselctivities of the PAA films were not changed by the variation of the degree of imidisation.