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Chemical modification of cashew gum with acrylamide using an ultrasound‐assisted method
Author(s) -
Klein Jalma Maria,
Silva de Lima Vanessa,
Couto da Feira José Manoel,
Nichele Brandalise Rosmary,
Camargo Forte Maria Madalena
Publication year - 2016
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.43634
Subject(s) - grafting , potassium persulfate , acrylamide , polyacrylamide , flocculation , copolymer , monomer , sonication , intrinsic viscosity , materials science , persulfate , polymer chemistry , chemistry , nuclear chemistry , chemical engineering , polymer , chromatography , organic chemistry , composite material , catalysis , engineering
A flocculant based on cashew gum (CG) grafted with polyacrylamide (PAM) was synthesized using potassium persulfate as the chemical initiator and ultrasound energy. The intrinsic viscosity, hydrodynamic radius, and grafting efficiency of the grafted copolymers (CG‐ g ‐PAM) were investigated at different monomer and initiator concentrations. The CG‐ g ‐PAM copolymers were evaluated in kaolin suspension and river water by using jar test procedure comparatively to a commercial flocculant (Flonex‐9045). Ultrasonication resulted in reduced reaction time and high grafting efficiency. The reaction gel point was reached within 10 min and the grafting efficiency was dependent on the acrylamide concentration. The grafted copolymer CG‐ g ‐PAM‐15 285 obtained with 0.285 mmol of initiator showed higher hydrodynamic radius, with flocculation efficacy of 96% comparable with the flocculant Flonex‐9045. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43634.