摘要
以纸浆为原料,分别采用过硫酸铵氧化降解法和酶处理结合机械研磨法制备纳米纤维素,并通过透射电子显微镜(TEM)、马尔文粒径仪、傅里叶红外光谱仪(FITR)和X-射线衍射仪(XRD)对所制备的纳米纤维素的微观形貌、谱学性能及晶型结构进行表征分析。结果表明,过硫酸铵氧化法和酶处理结合机械研磨法处理后纤维形貌尺寸均可达到纳米级别。其中过硫酸铵氧化后纤维尺寸较小,纤维形态多为短棒状,其悬浮液胶体呈淡蓝色,随着浓度的增加,黏度不断增大,分散稳定性较好;而酶法纤维素分散不均匀,团聚现象较为严重;两种方法处理后的纤维结构和晶型均没有改变,仍然保持纤维素Ⅰ型。此外,过硫酸铵氧化降解法简单、易操作,酶处理结合机械研磨法反应条件较为温和,但操作复杂。
Nanocellulose was prepared by means of oxidative degradation with ammonium persulfate and enzyme treatment combined with the grinding of pulp respectively. The morphology,spectrum properties and microstructure of the cellulose nanocrystals（ CNCs） were analyzed by transmission electron microscopy（ TEM）,Melvin particle size analyzer,Fourier transform infrared spectroscopy（ FTIR） and X-ray diffraction（ XRD）. The results showed that the size of the prepared nanocelluloses was at the nanometer level. The CNCs,prepared by oxidative degradation,were mostly short rod-tike. The viscosity and dispersing stability of its pale blue suspension increased with the increasing of concentration. The nanofibrillated celluloses,made by enzyme treatment combined with grinding,were scattered unevenly and the agglomeration was serious.The structure and crystal type of the cellulose prepared by both methods were not changed. The ammonium persulfate oxidation degradation process was relatively simple,while the process of enzyme treatment combined with grinding had milder reaction condition,but was complicated to operate.
出处
《林业科技开发》
北大核心
2015年第6期95-99,共5页
China Forestry Science and Technology
基金
国家林业公益性行业科研专项(201504603)
关键词
纸浆
氧化降解
酶处理
研磨
纳米纤维素
pulp
oxidative degradation
enzyme treatment
grinding
nanocellulose
