01983naa a2200265 a 450000100080000000500110000800800410001902400460006010000210010624501430012726000090027052011480027965000160142765000220144365000190146565300240148465300170150865300260152565300260155165300200157770000170159770000290161470000240164377300500166721141472020-06-10       2020    bl uuuu     u00u1 u    #d7 ahttps://doi.org/10.1515/hf-2019-00352DOI1 aMALUCELLI, L. C.  aCellulose triacetate from different sourcesbmodification assessment through thermal and chemical characterization.h[electronic resource]  c2020  aModification techniques have been widely employed to improve cellulose properties, thus increasing the diversity of industrial applications. While wood pulp cellulose is the most common source for industrial production, little has been studied about the effects of the cellulose source and its purity on modification. Therefore, this article investigates the influence of cellulose source (e.g. wood or cotton) on its modification (acetylation), by estimating the obtained degree of substitution (DS) through Fourier-transform infrared (FT-IR), proton nuclear magnetic resonance (1H NMR) and back titration. The intense reduction in samples? crystallinity after acetylation was a result of breakage of inter- and intra-molecular hydrogen bonds, thus confirming acetylation. Although Avicel showed the highest cellulose content and was virtually free of hemicellulose and lignin, this did not affect the acetylation degree, as all samples were successfully triacetylated. The techniques used in this study were ideal for detecting acetylation and estimating the DS, which makes them good tools for modification studies of cellulose derivatives.  aAcetylation  aCellulose acetate  aEsterification  aAcetato de celulose  aAcetilação  aCellulose derivatives  aDerivados de celulose  aEsterificação1 aLOMONACO, D.1 aCARVALHO FILHO, M. A. S.1 aMAGALHAES, W. L. E.  tHolzforschunggv. 74, n. 5, p. 505-512, 2020.