Microwave assisted synthesis of polyacrylamide grafted dextrin (Dxt-g-PAM): Development and application of a novel polymeric flocculant

An efficient polymeric flocculant was synthesized by microwave assisted grafting of polyacrylamide to dextrin. By varying the reaction conditions, various grades of graft copolymers were synthesized to obtain the optimized one. Viscometry, elemental analysis, FTIR spectroscopy, 13C NMR spectroscopy,...

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Bibliographic Details
Published in:International journal of biological macromolecules 2010-12, Vol.47 (5), p.623-631
Main Authors: Pal, Sagar, Nasim, T., Patra, A., Ghosh, S., Panda, A.B.
Format: Article
Language:English
Subjects:
Acrylic Resins - chemical synthesis
Acrylic Resins - chemistry
Chemistry, Organic - methods
Cyclodextrins - chemical synthesis
Cyclodextrins - chemistry
Dextrin
Flocculation
Graft copolymer
Kaolin - chemistry
Light
Magnetic Resonance Spectroscopy
Microscopy, Electron, Scanning
Microwave
Microwaves
Molecular Weight
Polymers - chemical synthesis
Polymers - chemistry
Scattering, Radiation
Settling velocity
Spectroscopy, Fourier Transform Infrared
Thermogravimetry
Time Factors
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Summary:An efficient polymeric flocculant was synthesized by microwave assisted grafting of polyacrylamide to dextrin. By varying the reaction conditions, various grades of graft copolymers were synthesized to obtain the optimized one. Viscometry, elemental analysis, FTIR spectroscopy, 13C NMR spectroscopy, determination of molecular weight and radius of gyration using SLS analysis, thermal analysis and SEM analysis were employed to confirm that polyacrylamide has been grafted onto the dextrin backbone. The flocculation efficiency of the grafted products in kaolin suspension was dependent on the molecular weight, radius of gyration and length of the grafted polyacrylamide chains. The flocculant obtained by microwave assisted grafting method was superior to dextrin and polyacrylamide-based commercial flocculant (Rishfloc 226 LV) in flocculation tests.
ISSN:0141-8130
1879-0003
DOI:10.1016/j.ijbiomac.2010.08.009