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One-pot tandem reactions for the preparation of esterified cellulose nanocrystals with 4-dimethylaminopyridine as a catalyst

机译:用4-二甲基氨基吡啶作为催化剂制备酯化纤维素纳米晶体的单壶串联反应

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摘要

An efficient approach for the manufacture of esterified cellulose nanocrystals (E-CNCs) via one-pot tandem reactions with 4-dimethylaminopyridine (DMAP) as a catalyst under mild operating conditions is put forward. The effects of ball milling time, reaction temperature and ultrasonication time on the yield and degree of substitution (DS) are explored. Characterization indicates the successful esterification of the hydroxyl groups of cellulose. The micromorphology and microstructure of the prepared E-CNCs are studied using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Results show that the E-CNCs are short rod-like particles 130-230 nm in length and 20-40 nm in width, forming an interconnected network structure. X-ray diffraction (XRD) results indicate that the crystallinity index increases from 63.5% to 77.2%. The thermal properties of the E-CNCs are investigated by thermogravimetric analysis (TGA) and the results show that the E-CNCs exhibit higher thermal stability than cellulose pulp.
机译:提出了通过用4-二甲基氨基吡啶(DMAP)为催化剂的一锅串联反应制备酯化纤维素纳米晶体(E-CNC)作为催化剂的一种有效的方法。探讨了球磨时间,反应温度和超声时间对替代率(DS)的影响。表征表明纤维素羟基的成功酯化。使用扫描电子显微镜(SEM)和透射电子显微镜(TEM)研究制备的E-CNC的微晶和微观结构。结果表明,E-CNC在长度和20-40nm的宽度的短杆状颗粒,宽度为20-40nm,形成互连的网络结构。 X射线衍射(XRD)结果表明结晶度指数从63.5%增加至77.2%。通过热重分析(TGA)研究了E-CNC的热性质,结果表明,E-CNCS表现出比纤维素纸浆更高的热稳定性。

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  • 来源
    《RSC Advances》 |2015年第69期|共7页
  • 作者单位

    Fujian Agr &

    Forestry Univ Fuzhou Peoples R China;

    Fujian Agr &

    Forestry Univ Fuzhou Peoples R China;

    Fujian Agr &

    Forestry Univ Fuzhou Peoples R China;

    Fujian Agr &

    Forestry Univ Fuzhou Peoples R China;

    Fujian Agr &

    Forestry Univ Fuzhou Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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