预处理溶剂对纤维素预处理效果的影响

doi:10.3969/j.issn.0253-2417.2014.02.015

Abstract

Abstract: Acetone(CH₃COCH₃)/NaOH, ethanol(EtOH)/NaOH and other chemical reagents systems were used for pre-treating cellulose. The R-10 value and water retention value (V_WR) were measured to evaluate their impacts on polymerization degree and accessibility of cellulose. The cellulose pretreated under the optimal condition was analyzed by XRD and FT-IR to evaluate their impacts on the crystal structure, functional groups and hydrogen bonds. The results showed that NaOH/H₂O₂/H₂O, ethylene glycol(EG)/H₂O₂/H₂O, CH₃COCH₃/NaOH and EtOH/NaOH systems exhibited better performance on the cellulose than other chemical reagents systems. The crystallinities of the pretreated celluloses were decreased from 65.3% to 61.3%, 63.7% and 49.8% as treated by NaOH/H₂O₂/H₂O, EG/H₂O₂/H₂O and EtOH/NaOH systems, respectively. The percentages of intermolecular hydrogen bonds were declined to 58.7%, 58.2% and 50.3% from 61.5%, respectively, but no crystal form changes were observed. However, in contrast, the crystal type changed as the cellulose was treated by CH₃COCH₃/NaOH system, and its crystallinity and percentage of intermolecular hydrogen bonds were reduced by 18 percent point and 14.7 percent point, respectively.

Key words: cellulose, pretreatment, R-10 value, hydrogen bond, crystallinity

CLC Number:

TQ35

GUO Jing, XIE Piao, GUAN Fu-cheng, WANG Zhi-chao, ZHANG Cheng-jiao. Influences on the Effect of Pretreating Cellulose by Pretreatment Solvents[J]. Chemistry and Industry of Forest Products, 2014, 34(2): 85-90.

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Influences on the Effect of Pretreating Cellulose by Pretreatment Solvents

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