Abstract

A semi-batch addition process for the addition of a difunctional monomer (MBA) is described for the production of homogeneous crosslinked cationic acrylamide-based copolymers. The produced semi-batch-wise MBA-added cationic copolymers show more structural regularity than their counterparts, the traditional batch-wise MBA-added copolymers. This is demonstrated through measurements of viscosimetry, density, solution properties and the powerful results of analytical ultracentrifugation. These semi-batch-wise MBA-added cationic copolymers exhibit higher intrinsic viscosity, a lower level of association/aggregation, and a significantly higher sedimentation coefficient than those traditional copolymers. These copolymers seem to be more efficient in the flocculation of suspended solids.

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