title: Microwave assisted synthesis of polyacrylamide grafted dextrin (Dxt-g-PAM): Development and application of a novel polymeric flocculant.
abstract: 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, (13)C 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.
authors: Polymer Chemistry Laboratory, Department of Applied Chemistry, Indian School of Mines, Dhanbad 826 004, Jharkhand, India. sagarpal1@hotmail.com
authors: Sagar
authors: S
authors: Pal
authors: T
authors: T
authors: Nasim
authors: A
authors: A
authors: Patra
authors: S
authors: S
authors: Ghosh
authors: A B
authors: AB
authors: Panda
mesh_terms: D000180:Acrylic Resins / Q000138:chemical synthesis* / Q000737:chemistry; D002625:Chemistry, Organic / Q000379:methods*; D003505:Cyclodextrins / Q000138:chemical synthesis* / Q000737:chemistry; D005427:Flocculation; D007616:Kaolin / Q000737:chemistry; D008027:Light; D009682:Magnetic Resonance Spectroscopy; D008855:Microscopy, Electron, Scanning; D008872:Microwaves; D008970:Molecular Weight; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry; D012542:Scattering, Radiation; D017550:Spectroscopy, Fourier Transform Infrared; D013818:Thermogravimetry; D013997:Time Factors; D000099166:Polyacrylamides
chemical_list: D000180:Acrylic Resins; D003505:Cyclodextrins; D007616:Kaolin; D011108:Polymers; D000099166:Polyacrylamides; C555619:polyacrylamide-g-dextrin