One pot synthesis and characterization of industrially important graft copolymer (GOH-g-ACM) by using peroxymonosulphate/mercaptosuccinic acid redox pair

Abstract

Guar gum-g-polyacrylamide is a graft copolymer which is used for many industrial applications. This paper outlines the details of synthesis of guar gum -g-acrylamide by using potassium peroxymonosulphate/ mercaptosuccinic acid redox pair in an inert atmosphere and their characterization by infrared spectroscopy, UV analysis and study of swelling and thermal properties. Grafting characteristics: %G, %E, %C, %A and %H were determined by using Fanta's definition; rate of grafting was also calculated. On studying the effect of reaction conditions on grafting characteristics, it was found that the optimum concentration of peroxymonosulphate, mercaptosuccinic acid, hydrogen ion, acrylamide and guar gum for maximum % of grafting were 8.0×10 -3, 3.2×10-3, 8.0×10-3, 16.0×10-2 mol dm-3 and 60.0×10 g dm -3 respectively. The optimum time duration and temperature of reaction were found to be 120 min and 40°C respectively. During the study [H+] variation showed prompt changes on grafting characteristics. It was found that after 310°C the Polyacrylamide grafted guar gum was thermally more stable than pure guar gum.