氧化降解法制备纳米纤维素的特性分析

发布时间：2018-12-11 08:01

【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。
[Abstract]:Nanocellulose (Cellulose Nanocrystals,CNCs) was prepared by oxidation and degradation of microcrystalline cellulose and pulp by ammonium persulfate respectively. Transmission electron microscope (TEM) (TEM), Ma Erwen particle size meter was used. Fourier transform infrared spectroscopy (FITR) and X-ray diffractometer (XRD) were used to characterize the microstructure, spectroscopic properties and crystal structure of the CNCs. The results show that the morphology of CNCs prepared by ammonium persulfate oxidation of microcrystalline cellulose is short rod, the diameter distribution is 5 ~ 20 nm, and the characteristic peak of Con O in carboxyl group appears near 1 731cm-1. The XRD diffraction pattern shows that the fiber structure is still cellulose I 尾. The diameter distribution of CNCs, and the aspect ratio of CNCs, prepared by ammonium persulfate oxidation pulp were 10 ~ 35 nm and 11 / 30 respectively. Compared with the raw pulp, the characteristic peak strength of cellulose corresponding to 112cm-1 and 898cm-1 was obviously enhanced at 3 420 ~ (2 900) C ~ (2 900) and 1 162N ~ (-1), compared with the raw pulp. The characteristic peaks of Con O in the carboxyl group appeared near 1 731cm-1. The XRD diffraction patterns also showed that the fiber was still a cellulose I 尾. CNCs suspension colloid was light blue. With the increase of the concentration, the viscosity increased and the dispersion stability was better.
【作者单位】：南京林业大学材料科学与工程学院;南京林业大学化学工程学院;
【基金】：林业公益性行业科研专项(201504603)
【分类号】：O636.11

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