摘要
利用过硫酸铵分别氧化降解微晶纤维素和纸浆制得纳米纤维素(Cellulose Nanocrystals,CNCs),采用透射电子显微镜(TEM)、马尔文粒径仪、傅利叶红外光谱仪(FITR)和X-射线衍射仪(XRD)对所制备的CNCs的微观形貌、谱学性能及晶型结构进行表征分析。结果表明:过硫酸铵氧化微晶纤维素制备的CNCs的形态呈短棒状,直径分布为5~20nm,其在1 731cm-1附近出现了羧基中C=O特征峰,XRD衍射图谱表明其纤维结构仍为纤维素Iβ;过硫酸铵氧化纸浆制备的CNCs,直径分布为10~35nm,长径比为11~30,与原料纸浆相比,在3 420、2 900、1 430、1 162、1 112cm-1和898cm-1对应的纤维素特征峰强度明显增强,在1 731cm-1附近出现了羧基中C=O特征峰,其XRD衍射图谱也表明纤维仍属于纤维素Iβ。CNCs悬浮液胶体呈淡蓝色,随着浓度的增加,粘度不断增大,分散稳定性较好。
CNCs were prepared with ammonium persulfate（APS）by oxidative degradation of microcrystalline cellulose（MCC）and the pulp respectively.Characterize the microstructure,morphology and spectrum properties of the CNCs with the help of transmission electron microscopy（TEM）,melvin particle size instrument,Fourier transform infrared（FITR）and X-ray diffraction（XRD）.The results showed that the prepared CNCs from MCCs were short-rod like,approximately in the range of 5-20 nm in diameter,the results of FITR showed the basic structure of cellulose and at 1 731cm^（-1） appeared the peak of C=O.The XRD diffraction pattern showed that the structure of the CNCs were still cellulose I;the diameter of CNCs prepared from pulp was approximately in the range of 10-35 nm and it＇s length to diameter ratio was in the range of 11 and 30,stronger peak of celluloseappeared at 3 420,1 430,2 900,1 112,1 162cm^（-1）,and 898cm^（-1） comparing with the raw material and also appeared the peak of C=O at 1 731cm^（-1）.The XRD diffraction pattern showed that CNCs belongto cellulose Ieither;CNC was scattered evenly andits suspension colloid was pale blue,and with the increase of concentration,the viscosity became higher and its dispersing stability was better.
出处
《西北林学院学报》
CSCD
北大核心
2016年第4期246-251,共6页
Journal of Northwest Forestry University
基金
林业公益性行业科研专项(201504603)
关键词
纳米纤维素
氧化降解
过硫酸铵
制备
纳米材料
nanocrystals
oxidative degradation
ammonium persulfate
preparation
nanomaterials
