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首页> 外文期刊>Journal of Applied Polymer Science >H3PW12O40 center dot 4H(2)O as an Efficient Catalyst for the Conversion of Cellulose into Partially Substituted Cellulose Acetate
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H3PW12O40 center dot 4H(2)O as an Efficient Catalyst for the Conversion of Cellulose into Partially Substituted Cellulose Acetate

机译：H3PW12O40中心点4H（2）O作为将纤维素转化为部分取代的乙酸纤维素的高效催化剂

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摘要

The preparation of partial acetylation of cellulose derived from rice straw was catalyzed by phosphotungstic acid with various numbers of crystal water, and H3PW12O40 center dot 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). (C) 2014 Wiley Periodicals, Inc.
机译：磷钨酸与不同数量的结晶水一起催化稻草衍生纤维素的部分乙酰化反应，发现H3PW12O40中心点4H（2）O是有效的催化剂。通过将直接从稻草中分离的纤维素转化为乙酰基之前的微晶纤维素，可以大大提高乙酸纤维素的收率。通过改变催化剂和乙酸酐的量以及反应条件（包括反应时间和介质）来研究乙酰化的优化，在优化条件下获得的取代度（DS）为2.29，产率为62.9％。通过傅里叶变换红外光谱（FTIR）和粉末X射线衍射（XRD）技术确认了乙酰化产物的结构和形成，并通过热分析（包括热重分析（TGA）和差示扫描量热法（DSC））确定了热性质。 ），并通过扫描电子显微镜（SEM）观察其形态。 （C）2014威利期刊公司

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