Abstract
ABSTRACT Free radical polymerization of acrylamide (Aam) in the presence of aqueous solution of three commercial grades of polyvinyl alcohol (PVOH), namely, Vinarol FV (containing very few acetyl groups), Mowiol 4-80 (low viscosity-partially hydrolyzed), and Vinarol STH (medium viscosity-partially hydrolyzed), using ammonium persulfate (AP) initiator resulted in three corresponding PVOH/Aam polyblends. Optimum polymerization conditions were PVOH and AP concentrations, 10% and 0.05 mol/L, respectively; Aam concentration, 50% based on the weight of PVOH; polymerization temperature and time, 70°C and 20 min, respectively; rate of stirring, 200 rpm, at which the three polyblends were prepared at very high polymerization extent ranging from 98.2 to 99.9%. Rheological properties of 10% aqueous solutions of the polyblends at 80°C were studied. The extent of film resolubility of PVOH's and their polyblends follows the descending order: Mowiol®4-80/Aam > Mowiol®4-80 > Vinarol®STH/Aam > Vinarol®STH > Vinarol®FV/Aam > Vinarol®FV. Sizing of gauzy cotton fabric with the polyblends and PVOH's showed that (1) their tensile strength follows the order: Vinarol®STH/Aam > Vinarol®STH > Mowiol®4-80/Aam > Mowiol®4-80 > Vinarol®FV/Aam > Vinarol®FV > Unsized and (2) their desizability follows the order: Mowiol®4-80/Aam > Mowiol®4-80 > Vinarol®STH/Aam > Vinarol®STH > Vinarol®FV/Aam > Vinarol®FV.
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