Luvitec k 30

PVDF was purchased from Solvay (Seoul, Republic of Korea)(Solef 1015, Mw = 570,000 g/mol). Gamma-butyrolactone (GBL, diluent), N-methyl-2-pyrrolidone (NMP, solvent), dimethylacetamide (DMAc, solvent), and ethylene glycol (EG, non-solvent) were purchased from the SAMCHUN Chemical (Pyeongtaek, Republic of Korea). NA11 (nucleating agent; NA) was purchased from Asahi Denka (Tokyo, Japan) (ADK STAB NA11, Sodium 2,2’-methylene bis-(4,6-di-tert-butylphenyl) phosphate). PVP (pore-forming additive) was purchased from BASF (Florham Park, NJ, USA) (LUVITEC K-30). The coagulation bath was composed of tap water as the non-solvent. All chemicals were used as received.

Polysulfone Ultrason S6010 natural (M_w = 50 kDa) and polyvinylpyrrolidones Luvitec K30 (M_w = 50 kDa) and Luvitec K90 (M_w = 1400 kDa) were provided by BASF (Ludwigshafen, Germany). The following reagents were used in this work: polyethylene glycol 400 (PEG-400, TC 2226-061-05766801-2006, Forvard Group, Moscow, Russia), sodium hypochlorite (grade “A”, 170–190 g/L, Russian Chemist, Moscow, Russia), ethanol (EtOH, 95%, Spirtmed, Moscow, Russia). Reverse osmosis water with a specific conductivity of no more than 30 μS/cm was produced on-site. The following extra pure (>99.5%) reagents, provided by CHIMMED, Russia were employed: N,N-dimethylacetamide (DMAc), isobutanol (BuOH), glycerin, sodium bisulfate.