Synthesis and characterization of a dextrin-polyacrylamide hybrid size for cotton
The polymerization of acrylamide with dextrin was effected using ceric ammonium sulphate (Ce +4 ), ammonium persulphate, benzoyl peroxide, potassium permanganate/ citric acid and hydrogen peroxide/ferrous ions as initiators. While the first three initiators are capable of inducing grafting of acrylamide onto dextrin in a decreasing order, the last two initiators fail to do so. For optimization, the Ce +4 was used under various conditions. Polymerization of acrylamide with dextrin gives a hybrid, the composition of which is largely determined by the monomer ratio in the polymerization system and the graft yield. Viscosity, solubility and hardness of the cast film depend on graft yield and type of dextrin used. Polyacrylamide-dextrin hybrid samples with viscosity values of 35-150 mPa.s were applied to light cotton fabric as the sizing agent. The fabric was evaluated for size add-on, size removal, breaking load and elongation at break.