NOVEL WATER-SOLUBLE BLOCK-COPOLYMERS OF DIMETHYLAMINOETHYL METHACRYLATE AND DIHYDROXYPROPYL METHACRYLATE

In this publication we describe the synthesis and properties of a nove l type of block copolymer. The anionically synthesised block copolymer consists of a neutral, water-soluble block (2,3-dihydroxypropyl metha crylate, HMA) and a pH-dependently charged one (2-dimethylaminoethyl m ethacrylate, AMA). The adsorption on silica and its effect on the coll oidal stability were evaluated. The adsorbed amount is mainly determin ed by the electrostatics, which leads to a maximum adsorbed amount at low AMA content. The block copolymers tend to destabilise colloidal si lica, due to a charge neutralisation upon adsorption, which is not com pensated by the formation of a steric layer.