Non-Solvent- and Temperature-Induced Phase Separations of Polylaurolactam Solutions in Benzyl Alcohol as Methods for Producing Microfiltration Membranes

The possibility of obtaining porous films through solutions polylaurolactam (PA12) in benzyl alcohol (BA) was considered. theoretical calculation the phase diagram showed presence upper critical solution temperature (UCST) for PA12/BA system at 157 °C. PA12 completely dissolved BA higher temperatures, but resulting underwent separation upon cooling down to 120–140 °C because PA12’s crystallization. viscosity 10–40% increased according a power law remained low and did not exceed 5 Pa·s 160 Regardless concentration, formed dispersed when its were cooled, which allow obtention strong films. On contrary, 20–30% under action non-solvent (isopropanol) leads formation flexible microporous measurement porosity, wettability, strength, permeability, rejection submicron particles best results film produced from 30% by non-solvent-induced separation. This process makes it possible obtain membrane material with 240 nm particle 99.6% permeate flow 1.5 kg/m2hbar contaminated water 69.9 pure water.