Abstract
In order to develop a durable membrane material for the separation of several organic liquids from their aqueous solutions by using pervaporation technique, oligodimethylsiloxane-grafted aromatic poly(amide–imide) copolymer was prepared by oligomer–polymer reaction. Poly(amide–imide) was reacted with NaH in DMSO to produce polyanion at the N-position of the amide group, followed by the reaction with chloromethylphenyl-terminated oligodimethylsiloxane (ODMS) to obtain the desired graft copolymer. By this oligomer–polymer reaction, ODMS chains with the average degree of polymerization of 13 or 19 were substituted on 19–85 mol % of the amide group, where the degree of substitution was controlled to some extent by changing the mole ratio of NaH and the amide group. The obtained copolymers were soluble in aprotic polar solvents such as DMSO and NMP, and insoluble in the ordinary organic solvents such as alcohol, acetone, THF, benzene, chloroform and dichloromethane. The copolymer membranes were easily prepared by the solvent-casting method from their NMP solutions. The obtained graft copolymer with high ODMS content exhibited the stable and selective permeation of organic solvents, such as alcohol, acetone, THF and dichloromethane, from their dilute aqueous solutions. For example, 0.8 wt % aqueous dichloromethane solution was concentrated to 72.9 wt %, where the separation factor (α) exceeded 334 with a flux of 0.99 kg m−2 h−1.
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Akimoto, M., Akiyama, E. & Nagase, Y. Preparation of Oligodimethylsiloxane-grafted Poly(amide–imide) Membrane and Its Separation Properties of Aqueous Organic Liquid Mixtures by Pervaporation. Polym J 36, 587–593 (2004). https://doi.org/10.1295/polymj.36.587
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DOI: https://doi.org/10.1295/polymj.36.587