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DADPE4,4'-Diaminodiphenyl Ether (chemistry)
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Although some common and cheap monomers such as pyromellitic dianhydride (PMDA) and 4,4'-diaminodiphenyl ether (ODA) can be used for the synthesis of polyimide, it is still difficult to obtain high-performance membranes in hollow fiber configuration.
The monomers of pyromellitic dianhydride (PMDA) and 4,4'-diaminodiphenyl ether (ODA) were from Sinopharm Chemical Reagent Corporation (China).
4,4'-Diaminodiphenyl ether (Shanghai Chemical Reagent), p-phenoxybenzoic acid (Shanghai Chemical Reagent) and 4,4'-diphenyldicarboxylic acid (Shanghai Chemical Reagent) were used as received.
After removal of SO[Cl.sub.2] under reduced pressure, the residue was dissolved in DMAc (180 mL) under nitrogen, then 4,4'-diaminodiphenyl ether (6.0 g, 30 mmol) was added at 0[degrees]C with stirring.
Recently, Yokota (21) developed an amorphous, asymmetric, and addition-type PI "TriA-PI." TriA-PI was prepared from asymmetric monomer 2,3,3',4-biphenylte-tracarboxylic dianhydride (a-BPDA), 4,4'-diaminodiphenyl ether (4,4'-ODA), and PEPA (4-phenylethynylphthalic anhydride).