PMSE 47 |
| Flocculants play a crucial role in wastewater treatment, sludge dewatering, papermaking and mineral processing industries. Current commercial synthetic flocculants are mainly acrylamide/cationic (meth)acrylate copolymers manufactured via free radical polymerization mechanism or by post-reaction modification of polyacrylamide to give linear random cationic flocculants with relatively high molecular weight. (~ 1,000,000 g/mol). This is because it is extremely difficult to synthesize high-molecular-weight charged polymers such as polyquats, polyimines, and polyamines due to strong repulsion between the monomer units. In this study, graft and random microgel copolymers of N,N-dimethylaminoethylacrylate methyl chloride quaternary salt (DMAEA.MCQ) and acrylamide (AM) containing various amounts of the quaternary salt were synthesized in dilute solution via a free radical mechanism using gamma radiation. The flocculation performance of the synthesized copolymers was evaluated by turbidity tests on a model dilute titanium dioxide colloid suspension and compared with commercial random copolymers of DMAEA.MCQ and AM. |
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New Concepts in Polymeric Materials
1:30 PM-5:25 PM, Sunday, August 19, 2007 Westin Boston Waterfront -- Grand Ballroom D, Oral
Division of Polymeric Materials: Science & Engineering |