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As-prepared P(AN¨CMMA) polymer was dissolved at a concentration of 8 wt.% in dimethylformamide (DMF). After complete dissolution, the resulting viscous solution was cast with a doctor blade onto a glass plate, then exposed to humidified atmosphere produced by ultrasonic humidifier (ultrasonic humidifier D205, Beijing Yadu Science and Technology Co. Ltd.) for 30 min at room temperature, inducing phase inversion. After the exchange of DMF and water by phase inversion, a substantial number of pores were formed in the films. The resulting membranes were washed, rinsed and dried at 60 ◦C under vacuum for 24 h, successively, before further processing.

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