用磷酸高产率生产热稳定纤维素纳米晶体的混合酸方法

IF 20.2 Q1 MATERIALS SCIENCE, PAPER & WOOD Journal of Bioresources and Bioproducts Pub Date : 2022-05-01 DOI:10.1016/j.jobab.2021.12.002
Khairatun Najwa Mohd Amin , Alireza Hosseinmardi , Darren J. Martin , Pratheep K. Annamalai
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引用次数: 30

摘要

纤维素纳米晶体(CNC)具有独特的形状形态,增强的热稳定性和分散性,是克服高温熔融复合加工聚合物/CNC纳米复合材料所面临的挑战所必需的。本研究展示了一种混合酸水解方法,以生产具有更好的热稳定性和高生产率的CNC。磷酸(H3PO4)作为一种温和的酸,与强酸硫酸(H2SO4)或盐酸(HCl)结合使用,可以减少强酸的使用,降低对环境的影响。以H3PO4与腐蚀性酸(H2SO4和HCl)的比例为4:1,料液比为175为条件,考察了酸组合和加酸顺序对产率的影响。与单酸水解相比,该方法可以分离出具有更高热稳定性、分散性和生产率的CNC,使用1g CNC的酸量。H3PO4和HCl复合制备的CNC具有较高的热稳定性、分散性和棒状形貌,长(424±86)nm,宽(22±3)nm。此外,在生产相同数量的CNC时,与单一酸水解法相比,该方法减少了54%的H3PO4消耗。
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A mixed acid methodology to produce thermally stable cellulose nanocrystal at high yield using phosphoric acid

Cellulose nanocrystal (CNC) with distinctive shape-morphology, enhanced thermal stability and dispersibility is essential for overcoming the challenges in processing polymer/CNC nanocomposites through melt compounding at elevated temperatures. This study shows a mixed acid hydrolysis method to produce CNC with improved thermal stability and high productivity. The use of phosphoric acid (H3PO4), as a mild acid, in combination with a strong acid either sulphuric acid (H2SO4) or hydrochloric acid (HCl) leads to reduced use of strong acids and low impact on our environment. The influences of acid combination and sequence of addition on the production yield were investigated by retaining the proportion of H3PO4 to corrosive acid (H2SO4 and HCl) 4 to 1, and solid to liquid ratio 1꞉75. This methodology has enabled to isolate CNC with higher thermal stability, dispersibility and productivity in terms of amount acid used 1 g of CNC, as compared with single acid hydrolysis. The CNC produced using the combination of H3PO4 and HCl exhibits high thermal stability, dispersibility and rod-like shape morphology with length and width of (424 ± 86) and (22 ± 3) nm, respectively. Moreover, this approach has reduced H3PO4 consumption by 54% as compared with single acid hydrolysis method for the production of same amount of CNC.

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来源期刊
Journal of Bioresources and Bioproducts
Journal of Bioresources and Bioproducts Agricultural and Biological Sciences-Forestry
CiteScore
39.30
自引率
0.00%
发文量
38
审稿时长
12 weeks
期刊最新文献
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