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Novel polymeric flocculants based on polyacrylamide grafted dextran in kaolin suspension
Author(s) -
Krishnamoorthi S.,
Adhikary P.,
Mal D.,
Singh R. P.
Publication year - 2010
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.32716
Subject(s) - ceric ammonium nitrate , polyacrylamide , copolymer , flocculation , dextran , polymer chemistry , polymer , materials science , chemical engineering , chemistry , chromatography , organic chemistry , composite material , engineering
A study is done on ceric‐ammonium‐nitrate (CAN) initiated graft copolymerization of polyacrylamide (PAM) on to dextran (Dx) by solution polymerization technique. The average molecular weight of dextran is 7.0 × 10 −6 g/mole. By changing the concentrations of the initiator in the reaction feed, a series of graft copolymer (Dx‐g‐PAM1 to Dx‐g‐PAM4) with variation in the number and length of the grafted PAM chains are obtained. The flocculation characteristics of various polymers are investigated by the use of settling tests in 2 wt % using kaolin suspensions. Among the series of graft copolymers, the one with highest molecular weight shows superior performance. The flocculation characteristics of the best‐performing graft copolymer (Dx‐g‐PAM3) are compared with those of various commercially available flocculants and PAM in the kaolin suspension. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010