摘要
研究了棉短绒纤维和针叶木纤维经氢氧化钠活化后对其在离子液体1-丁基-3-甲基咪唑氯代盐([BMIN]Cl)与二甲基亚砜(DMSO)共容积体系中溶解度的影响。研究结果表明棉短绒纤维和针叶木纤维活化后在该溶解体系的溶解度分别从3.9%、2.8%提高到7.1%、5.0%,比未活化前增大了近1倍,说明这两种纤维素用氢氧化钠活化后在离子液体中更易溶解。活化的棉短绒纤维和未活化的棉短绒纤维在溶解再生后聚合度分别从612、578下降至423、350,分别降低了30.8%、39.4%;活化的针叶木纤维和未活化的针叶木纤维在溶解再生后聚合度则分别从736、704下降至607、502,降低了17.5%、28.7%.红外光谱证实离子液体[BMIN]Cl/DMSO溶解体系为纤维素的非衍生化溶剂。X-射线衍射(XRD)实验证实经过氢氧化钠活化处理的纤维素相比未经过活化处理的纤维素衍射峰强度降低得更厉害,说明在氢氧化钠活化过程中也能降低纤维素的结晶度,有助于纤维素在离子液体中的溶解。
In this paper, the influence of NaOH activating methods on cellulose dissolution in ionic liquid/DMSO system from cotton linter and soft wood kraft pulp was studied. The dissolubility of cotton linter and softwood pulp was improved after activation from 3.9% and 2.8% to 7.1% and 5.0% respectively, which was nearly double of that without activation. The degree of polymerization of cotton linter before and after activation were decreased from 612 and 578 to 423 and 350, dropped by 30.8% and 39.4% respectively, while those of softwood pulp were from 736 and 704 to 607 and 502, reduced by 17.5% and 28.7% , separately. The result of infrared spectrum demonstrated that new groups did not appear after dissolution, which indicated that the system was not a cellulose derivative solution. X - ray diffraction （XRD） showed that diffraction peaks from regenerated cellulose after activation were dropped more than that of those before activation.
出处
《造纸科学与技术》
北大核心
2012年第5期5-8,64,共5页
Paper Science & Technology
基金
国家自然科学基金(31100441)
华南理工大学制浆造纸工程国家重点实验室开放课题(200902)资助项目
