基于NaOH-Urea预处理的微纤化纤维素制备研究  

Preparation of Microfibrillated Cellulose Based on NaOH-Urea Pretreatment

作　　者：罗显星 王习文[1] LUO Xian-xing;WANG Xi-wen(State Key Lab of Pulp arid Paper Engineering,South China University of Technology,Guangzhou,Guangdong Province,510640)

机构地区：[1]华南理工大学制浆造纸工程国家重点实验室,广东广州510640

出　　处：《中国造纸学报》2018年第2期1-5,共5页Transactions of China Pulp and Paper

基　　金：国家自然科学基金(31470608);中央高校基本业务费(201522117)

摘　　要：为开发高效制备微纤化纤维素的方法,探讨了基于氢氧化钠-尿素(NaOH-Urea)混合溶液对玉米芯微晶纤维素进行预处理后采用机械法处理的微纤化纤维素制备工艺。采用傅里叶变换红外光谱仪(FT-IR)、X射线衍射仪(XRD)、热重分析仪(TG)、场发射扫描电镜(FESEM)对制备的微纤化纤维素化学结构、结晶度、热稳定性及微观形貌进行表征。结果表明,制备的微纤化纤维素为纤维素Ⅰ型;微纤化纤维素的结晶度为60. 4%,得率高达78%;微纤化纤维素结晶度较玉米芯微晶纤维素有所提高;制备的微纤化纤维素表现出优良的热稳定性,热降解温度达238℃;微纤化纤维素呈棒状,直径为5～20 nm,长度大于200 nm。in order to develop an efficient method for preparing microfibrillated cellulose （MFC） , the microctTstalline cellulose （MCC） of corncob powder was pretreated by NaOH-Urea solution, and follwed by mechanical treatment to prepare MFC. The chemical structure, crystallinity, thermostability and microtopography of MFC were characterized by fourier transform infrared spectroscopy （FT-IR） , X-ray diffraction （XRD）, thermogravimetric （TG） , and field emission scanning electron microscopy （FESEM）. The results showed that the prepared MFC was cellulose I type with the yield up to 78%. The crystallinity of MFC was 60, 4% , and increased compared with the MCC. MFC showed excellent thermal stability and the thermal degradation temperature was up to 238℃. MFC was long rod-like with the diameter of 5 - 20 nm, the length was longer than 200 nm.

关 键 词：氢氧化钠尿素溶液 预处理 微纤化纤维素 

分 类 号：TS721.4[轻工技术与工程—制浆造纸工程]