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林产化学与工业 ›› 2014, Vol. 34 ›› Issue (2): 85-90.doi: 10.3969/j.issn.0253-2417.2014.02.015

• 研究报告 • 上一篇    下一篇

预处理溶剂对纤维素预处理效果的影响

郭静, 谢飘, 管福成, 王志超, 张成娇   

  1. 大连工业大学 纺织与材料工程学院, 辽宁 大连 116034
  • 收稿日期:2013-04-07 出版日期:2014-04-25 发布日期:2014-04-26
  • 作者简介:郭静(1962-),女,辽宁大连人,教授,博士,硕士生导师,主要从事高分子材料改性与成型加工技术;E-mail:guojing8168@163.com。
  • 基金资助:
    辽宁省教育厅重点实验室项目(LS2010010)

Influences on the Effect of Pretreating Cellulose by Pretreatment Solvents

GUO Jing, XIE Piao, GUAN Fu-cheng, WANG Zhi-chao, ZHANG Cheng-jiao   

  1. Department of Textile and Materials Engineering, Dalian Polytechnic University, Dalian 116034, China
  • Received:2013-04-07 Online:2014-04-25 Published:2014-04-26

摘要: 分别采用丙酮(CH3COCH3)/NaOH、乙醇 (EtOH)/NaOH等10种化学试剂体系对纸浆纤维素进行预处理,通过R-10值和保水值(VWR)的测定,比较各化学试剂体系对纤维素平均聚合度和可及度的影响,然后选出预处理效果好的纤维素进行XRD和FT-IR测试,研究对应的体系对纤维素结晶构造、官能团和氢键的影响。结果表明:NaOH/H2O2/H2O、乙二醇(EG)/H2O2/H2O、EtOH/NaOH、CH3COCH3/NaOH这4大体系预处理纤维素的效果要好于其它体系;纤维素经NaOH/H2O2/H2O、EG/H2O2/H2O和EtOH/NaOH体系处理后,结晶度由65.3%分别下降为61.3%、63.7%和49.8%,分子间氢键相对百分数由61.5%分别降为58.7%、58.2%和50.3%,但晶型没有发生变化,而经丙酮/氢氧化钠体系处理后,晶型发生了改变,结晶度降低了18个百分点,分子间氢键相对百分数下降了14.7个百分点。

关键词: 纤维素, 预处理, R-10值, 氢键, 结晶度

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 (VWR) 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

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