caracterização de acetato de celulose obtido a partir do bagaço de cana-de-açúcar por ¹h-rmn 1h-nmr characterization of cellulose acetate obtained from sugarcane bagasse
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2010
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Abstract
A celulose do bagaço de cana-de-açúcar foi usada para sintetizar acetato de celulose com diferentes graus de substituição, os quais foram caracterizados por ¹H-RMN através da relação entre as áreas dos picos dos átomos de hidrogênio presentes nos grupos acetato (-(C=O)OCH3) e os picos dos hidrogênios ligados aos átomos de carbono dos anéis glicosídicos. A supressão de alguns sinais foi feita para remover sinais de ressonância da água residual nos materiais e também para remover sinais de impurezas no triacetato de celulose. Um método de deconvolução para o cálculo computacional do grau de substituição foi proposto. Os graus de substituição das amostras de acetato de celulose foram 2,94 e 2,60, o que está de acordo com os resultados por determinação química através de uma titulação ácido base.
Cellulose from sugarcane bagasse was used for synthesizing cellulose acetate with different degrees of substitution, which were characterized by ¹H-NMR through the relationship between the peak areas of the hydrogen atoms of the acetate groups (-(C=O)OCH3) and the peaks of the hydrogen bonded to the carbon atoms of the glucosidic rings. Suppression of some signals was carried out in order to remove the residual water resonance in the materials and those related to impurities in cellulose triacetate as well. A deconvolution method for the computation of the degree of substitution of acetylation is proposed. The degrees of substitution for the cellulose samples were 2.94 and 2.60, in good agreement with those obtained by chemical determination through an acid-base titration.
Cellulose from sugarcane bagasse was used for synthesizing cellulose acetate with different degrees of substitution, which were characterized by ¹H-NMR through the relationship between the peak areas of the hydrogen atoms of the acetate groups (-(C=O)OCH3) and the peaks of the hydrogen bonded to the carbon atoms of the glucosidic rings. Suppression of some signals was carried out in order to remove the residual water resonance in the materials and those related to impurities in cellulose triacetate as well. A deconvolution method for the computation of the degree of substitution of acetylation is proposed. The degrees of substitution for the cellulose samples were 2.94 and 2.60, in good agreement with those obtained by chemical determination through an acid-base titration.
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cerqueira2010polmeroscaracterizao
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| Authors | ;Daniel A. Cerqueira;Guimes Rodrigues Filho;Rui de A. Carvalho;Artur J. M. Valente |
| Journal | journal of the chemical society, perkin transactions 1 |
| Year | 2010 |
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