Chemical modification of cashew gum with acrylamide using an ultrasound‐assisted method |
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| Authors: | Jalma Maria Klein Vanessa Silva de Lima José Manoel Couto da Feira Rosmary Nichele Brandalise Maria Madalena de Camargo Forte |
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| Affiliation: | 1. Laboratory of Polymeric Materials (LAPOL), Engineering School, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil;2. Exact Science and Technology Center, University of Caxias do Sul (UCS), Caxias do Sul, RS, Brazil |
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| Abstract: | 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‐15285 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. |
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| Keywords: | copolymers grafting polyelectrolytes polysaccharides |
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