Abstract
Several graft copolymers of starch with acrylonitrile having different percentage graft-on were prepared by using cerium(IV) initiating system. The percentage graft-on was varied by changing the acrylonitrile concentration in the initial feed. The graft copolymers were characterized by IR spectroscopy and density measurements. The appearance of an absorption band at 2240 cm −1 in the graft copolymers was taken as evidence for grafting. The density of starch decreased on graft copolymerization. Thermal behaviour of graft copolymers was investigated using dynamic thermogravimetry in a nitrogen atmosphere. An improvement in thermal stability of starch was observed on grafting with acrylonitrile. An increase in percentage graft-on resulted in an increase in anaerobic char yield at 550 ° C. A graft copolymer sample having 97.7% graft-on had a char yield of 52%, which was higher than polyacrylonitrile.
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