Portal de Periódicos da CAPES

Grafting of polyacrylonitrile onto guar gum under microwave irradiation

2004; Wiley; Volume: 92; Issue: 3 Linguagem: Inglês

10.1002/app.20099

1097-4628

Vandana Singh, Ashutosh Tiwari, Devendra Narayan Tripathi, Rashmi Sanghi,

biodegradable polymer synthesis and properties

Abstract Using microwave (MW) irradiation grafting of polyacrylonitrile (PAN) onto guar gum in water was done without using any radical initiator or catalyst within a very short reaction time. The extent of grafting could be adjusted by controlling the reaction conditions and maximum percentage grafting (% G ) of about 188% was obtained under optimum conditions in 1.66 min. The average molecular weight of the grafted PAN chains and water‐retention power of the alkali hydrolyzed MW‐grafted gums were also determined and compared with those of the conventionally synthesized (cs) graft copolymer. A representative MW‐grafted copolymer, guar‐ g ‐polyacrylonitrile was characterized by IR, NMR, XRD, TGA, and elemental analysis. A plausible mechanism for the grafting under MW was proposed. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 1569–1575, 2004