Abstract: In this paper, IR a11d X-Ray diffractions were used to investigate the rheological properties of starch modified by acrylic copolymer (methacrylate/butyl acrylate/acrylic acid). It was found that the grafting copolymerization of copolymer ocurred on the starch granula. The modified starch retained its structure as it was before.The rheological properties of the solution of modified starch were tested by Brabender viscometer.

Key words: Acrylic copolymer Paste of modified starch Rheological properties