Water-soluble anhydride containing alternating copolymers as scale inhibitors

Scale can be defined as adherent deposit of inorganic compounds which is formed by precipitation of salts from water and crystal growth on the surfaces. Scale formation can be inhibited by adding sequestering or chelating polymers to the water treatment system. Water-soluble or dispersible copolymers of ethylenically unsaturated monomers with sulphate, phosphate or carboxylic terminated are useful as deposit control and corrosion inhibition agents in water treatment, pulp and paper manufacturing processes and as rheology modifiers for concrete and cement additives and as hydrophilic modifier components in personal care, cosmetic and pharmaceutical formulations. Anhydride groups containing poly(maleic anhydride-alt-acrylic acid) are expected to show considerably high inhibition activity due to the anionic character formed after their hydrolysis. The structural properties of copolymer were identified by viscosity, acid number (AN) experiments FTIR, GPC, and DSC analyses. The inhibitory behavior of the polymer was determined by using EDTA titration standard method. Also the assessment of effectiveness soluble calcium ion using of copolymer tested with respect to inhibition crystal growth calcium carbonate was followed by XRD and SEM.