Preparation and properties of stable nano interpoymer complex from polycation and polyanion with high density of charge by direct mixing

When stable nano interpolymer complex was intended to prepare with component polymers with high density of charge by direct mixing, large complex particle formation and sediment were two easily encountered problems. In this study, a randomly branched polycation (PTEG) with high density of charge, hydrophilic groups and hydrophilic chains was synthesized through ring-opening addition and quaternization reactions and whether it could be used to prepare small stable interpolymer complex nanoparticle was examined. The structures of PTEG and its precursor and the complex were characterized by H 1 NMR and FTIR. Complex particle size and stability were characterized by UV–Vis and dynamic light scattering. Results showed that complexes prepared at every condition had narrow particle diameter distribution and particles with diameter of 50 nm hold the highest propotion at all composition ratios. After 7 days of static standing, the status and apparent absorbance had no obvious changes. PTEG realized the preparation of small stable complex particles by direct mixing component polymers with high density of charge.