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H 3 PW 12 O 40 ·4H 2 O as an efficient catalyst for the conversion of cellulose into partially substituted cellulose acetate
Author(s) -
Liao Chongjing,
Fang Tao,
Luo Shanshan,
Fan GuoZhi,
Song Guangsen
Publication year - 2015
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.41212
Subject(s) - acetic anhydride , microcrystalline cellulose , cellulose , differential scanning calorimetry , fourier transform infrared spectroscopy , thermogravimetry , nuclear chemistry , materials science , yield (engineering) , catalysis , acetic acid , scanning electron microscope , cellulose acetate , thermal analysis , polymer chemistry , chemistry , organic chemistry , chemical engineering , inorganic chemistry , composite material , engineering , physics , thermal , meteorology , thermodynamics
The preparation of partial acetylation of cellulose derived from rice straw was catalyzed by phosphotungstic acid with various numbers of crystal water, and H 3 PW 12 O 40 ·4H 2 O was found to be as effective catalyst. The yield of the cellulose acetate was significantly enhanced by converting cellulose directly isolated from rice straw into microcrystalline cellulose before acetylation. The optimization of the acetylation was investigated by varying the amount of catalyst and acetic anhydride as well as reaction conditions including reaction time and medium, and a degree of substitution (DS) value of 2.29 and yield of 62.9% were obtained under the optimized conditions. The structure and the formation of the acetylated product were confirmed by Fourier transform infrared spectroscopy (FTIR) and powder X‐ray diffraction (XRD) technique, the thermal properties were determined by thermal analysis including thermogravimetry analysis (TGA) and differential scanning calorimetry (DSC), and the morphology was observed by scanning electron microscope (SEM). © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41212.