Graft copolymerization of methacrylamide on guar gum using PDP/malonic acid redox pair

Abstract

<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "dejavu="" sans";mso-hansi-theme-font:minor-latin;mso-bidi-font-family:mangal;="" mso-bidi-theme-font:minor-bidi;color:#00000a;mso-ansi-language:en-us;="" mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">The effect of reaction condition on the grafting parameters during the grafting of methacrylamide (MAM) onto guar gum (GOH) using potassium peroxydiphosphate (PDP)-malonic acid (MA) redoxcouple has been studied. For higher grafting ratio and efficiency, the concentration of PDP and malonic acid should be above 2 x 10^-2 mol dm^-3 and between (5-6 x 10^-3) mol dm^-3, respectively. The concentration of methacrylamide and hydrogen ion should be 20 x 10^-2 mol dm^-3 and 4.25 x 10^-2 mol dm^-3, respectively. Optimum temperature for grafting is 40°C. As the time period of reaction is increased grafting ratio increases. The plausible mechanism of grafting has been suggested.</span>