Approaching Ratio of Solution as a Key Parameter Affecting theCharacteristics of Porous Films Prepared via EIPS

The model poly (styrene-co-acrylonitrile) SAN porous films were fabricated by evaporation-inducedphase separation (EIPS). The effects of nonsolvent and polymer concentrations on the structure ofporous films were inspected. The approaching ratio of solution (ARSolution) was defined as an indexof the proximity of the initial solution composition to the two-phase region in the phase diagram. Theporosity of the films and the nonsolvent efficiency for creating pores (EfNS) increased with increasingARSolution, while the size and number of pores increased and then decreased.

کلیدواژه ها:

Porous films ، EIPS ، Phase diagram ، Approaching ratio