Synthesis and Characterization of Vinyl Acetate Grafted onto Obeche Wood (Triplochiton scleroxylon) Cellulose Material
This study was aimed at investigating the synthesis and characterization of vinyl acetate grafted on Obeche wood Cellulose. Vinyl acetate monomer was grafted onto the Obeche derived cellulose using benzoyl peroxide as initiator at varied temperatures. The Obeche cellulose-g-poly (vinyl acetate) was brown in colour. The effect of initiator concentration, monomer concentration and temperature on percentage grafting and grafting efficiency of the product was determined. Both percentage grafting and grafting efficiency increased with initiator concentration and monomer concentration for the Obeche cellulose-g-poly (vinyl acetate). The percentage grafting and grafting efficiency increased with temperature from 60°C – 70°C then dropped after 70°C for the Obeche cellulose-g-poly (vinyl acetate) sample. The graft copolymer was analyzed and characterized using various tests that included Fourier transformed infrared spectrophotometer, physico-mechanical tests that were, hardness test with durometer shore hardness tester, density with Monsanto Densitron 2000, softening point tester with HDT/Vicat Test Station and adsorption studies of bromothymol blue onto the sample was done with Ultraviolet-visible spectrophotometer. The result of the FTIR confirmed the presence of O-H of alcohol (3410 cm-1), C=O of esters (1734 cm-1), N-H of protein (2310 cm-1), C-H of methyl, methylene (2935 cm-1), and C-O of esters (1236 cm-1) in the Obeche cellulose-g-poly (vinyl acetate), result of the hardness showed that the Obeche cellulose-g-poly (vinyl acetate) was 65D, the density was 0.85 mg/m3, and the softening point was 125°C - 140°C. The percentage of bromothymol blue removed from aqueous solution by Obeche cellulose-g-poly (vinyl acetate) was 64.3%. The rate constants for the Obeche graft copolymer was determined using pseudo first order kinetics and it gave 3.36 x 10-2 min-1. The research showed that Obeche cellulose-g-poly (vinyl acetate) could be used in the adsorption of bromothymol blue (dye) in aqueous solution.
Obeche Cellulose-g-Poly (Vinyl Acetate), Obeche Wood Fiber, Graft Copolymer
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