Composite membranes from polyacrylonitrile with poly(N,N-dimethylaminoethyl methacrylate)-grafted silica nanoparticles as additives

Polyacrylonitrile (PAN)-based composite membranes were prepared by immersion precipitation method by using poly( N , N -dimethylaminoethyl methacrylate)-grafted silica (PDMAEMA@SiO 2 ) nanoparticles as hydrophilic additives. The molecular weight of PDMAEMA were controlled by the surface initiated atom transfer radical polymerization of N , N -dimethylaminoethyl methacrylate on SiO 2 nanoparticles. The synthesized nanoparticles have a typical core–shell structure as characterized in detail by FT-IR, TEM , DLS and GPC . The prepared PAN-based composite membranes have higher porosity and water permeation flux than those of the pure PAN membranes. They also show high rejection (⩾90%) to bovine serum albumin and high flux recovery ratio (⩾90%) to water permeation. These improved performances are attributed to the good hydrophilicity of PDMAEMA@SiO 2 nanoparticles. The results suggest that PDMAEMA@SiO 2 nanoparticles are suitable for the property optimization of PAN-based composite membranes.