Abstract
Cellulose acetate was obtained from the coir fiber submitted to the treatment with the IL. The coir fiber was initially subjected to treatment with the n-butylammonium acetate IL (CFIL) and subsequent bleaching (CFILB). By analyzing the CFILB, it was possible to observe a delignification of 6.10% in relation to the natural material and an 8.1% increase in the concentration of cellulose. The results from SEM, XRD, and FTIR-ART confirm the modifications in the fiber. After characterizing the treated coir fiber and obtaining the cellulose acetate, analyses by NMR confirmed its regeneration with a degree of substitution at 2.92. FTIR analyses corroborate with the obtained data, verifying the presence of the main adsorption bands. The XRD analysis of cellulose acetate shows peaks at 8.5° regarding the randomness after the acetylation of cellulose, as well as peaks between 18° and 22.5° regarding the packing of carbon atoms due to the Van der Waals forces, which confirm the production of cellulose acetate. The thermal analysis shows that decomposition events occurred in two stages, indicating the thermal decomposition of the remaining cellulose, which did not undergo acetylation, and attribution to its thermal degradation.
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Acknowledgements
This work has been supported by the Fundação Educacional Inaciana Padre Sabóia de Medeiros (FEI) and FAPESP granted scholarship #2017/05485-3. We thank Dr. Nivaldo Boralle for the NMR measurements and LMA-IQ UNESP-Araraquara for making the high-resolution electronic scanning microscope available.
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de Andrade Neto, J.C., de Almeida, A.C., dos Santos Machado, C. et al. Attainment of cellulose acetate from coir fiber submitted to pretreatment with IL n-butylammonium acetate. Iran Polym J 28, 425–433 (2019). https://doi.org/10.1007/s13726-019-00711-9
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DOI: https://doi.org/10.1007/s13726-019-00711-9