EFFECTS OF BALL MILLING AND ENZYME TREATMENT ON CELLULOSE ACETYLATION

IF 1.3 4区农林科学 Q2 MATERIALS SCIENCE, PAPER & WOOD Cellulose Chemistry and Technology Pub Date : 2023-09-29 DOI:10.35812/cellulosechemtechnol.2023.57.64

M. MAHBUBUR RAHMAN, MD. NURUL ANWAR KHAN, MD. KAMRUL HASAN, MAHBUB ALAM, M. MOSTAFIZUR RAHMAN, M. SHAHRIAR BASHAR, MD. AFTAB ALI SHAIKH, M. SARWAR JAHAN

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Abstract

A novel process was developed to produce cellulose acetate from bleached hardwood kraft pulp (BHKP) through ball milling and cellulase treatment. The ball milling and/or cellulase treatment of BHKP increased the esterification reaction, but enzyme treatment reduced the viscosity of the produced cellulose acetate (CA). The degree of substitution (DS) values upon acetylation were 2.26 for BHKP, 2.61 for ball-milled BHKP and 2.91 for ball milled followed by cellulase treatment of BHKP. The prepared CA was also characterized by FTIR, XRD, TGA, 1H-NMR and SEM. A strong band for –OH stretching of cellulose disappeared and created a strong band for carbonyl (C=O) group on esterification of BHKP. The crystallinity index of BHKP was 63.3%, which completely disappeared on acetylation, demonstrating the successful esterification of cellulose. The initial weight loss of cellulose acetates was lower than that of the native cellulose, as observed in TGA, indicating the acetylated samples are less hydrophilic. 1H NMR spectroscopy confirmed the complete structure of cellulose acetate.

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球磨和酶处理对纤维素乙酰化的影响

研究了以漂白硬木硫酸盐浆为原料，经球磨和纤维素酶处理生产醋酸纤维素的新工艺。BHKP的球磨和/或纤维素酶处理增加了酯化反应，但酶处理降低了生产的醋酸纤维素(CA)的粘度。纤维素酶处理后乙酰化取代度为2.26，球磨取代度为2.61，球磨取代度为2.91。并用FTIR、XRD、TGA、1H-NMR和SEM对所制备的CA进行了表征。在BHKP的酯化反应中，纤维素-OH拉伸的强带消失，形成羰基(C=O)的强带。BHKP的结晶度指数为63.3%，乙酰化后结晶度完全消失，表明纤维素酯化成功。通过TGA观察，醋酸纤维素的初始失重量低于天然纤维素，表明乙酰化后的样品亲水性较差。1H核磁共振谱证实了醋酸纤维素的完整结构。

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来源期刊

Cellulose Chemistry and Technology 工程技术-材料科学：纸与木材

CiteScore

2.30

自引率

23.10%

发文量

审稿时长

7.3 months

期刊介绍： Cellulose Chemistry and Technology covers the study and exploitation of the industrial applications of carbohydrate polymers in areas such as food, textiles, paper, wood, adhesives, pharmaceuticals, oil field applications and industrial chemistry. Topics include: • studies of structure and properties • biological and industrial development • analytical methods • chemical and microbiological modifications • interactions with other materials