Comparative Study of Acetylation of Rice Straw Fiber With or Without Catalysts
Keywords:Rice straw fiber, acetylation, catalyst, FT-IR, <sup>13</sup>C-NMR, thermal stability
AbstractThe reaction of acetic anhydride with rice straw fiber without solvent was investigated, and the extent of acetylation was measured by weight percent gain, which increased with an increment of reaction time or temperature. Meanwhile, the potential of four tertiary amine catalysts (pyridine, 4-dimethylamino pyridine, N-methyl pyrrolidine, and N-methyl pyrrolidinone) for the acetylation at 100°C for 0.5 h was also studied. The hypernucleophile 4-dimethylamino pyridine was found to be the most effective catalyst of those studied. The characterization of acetylated fibers was performed by FT-IR, CP MAS 13C-NMR, and thermal studies. Thermal stability of acetylated rice straw fiber was found to be higher than the unreacted fiber and increased with weight percent gain due to the acetylation.
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