Characterization of graft copolymer based on polyacrylamide and dextran

摘要

Graft copolymers of dextran and polyacrylamide have been synthesized by grafting polyacrylamide chains onto dextran backbone using a ceric-ion-induced solution polymerization technique.By varying the amount of CAN (ceric ammonium nitrate) initiator,four different grades of graft copolymers (Dx-g-PAM) are synthesized.These graft copolymers are characterized by elemental analysis,infrared spectroscopy,intrinsic viscosity measurement,molecular weight determination,rheological technique,scanning electron microscopy,thermal analysis (DTG) and X-ray diffractometry.They exhibit efficient flocculation characteristics in various suspensions and viscosify-ing characteristics as well.