椰壳纳米纤维素晶须的氧化法制备

椰壳纤维资源丰富,然而纳尺度化的利用较少。采用氧化法制备椰壳纳米纤维素晶须的TEM结果表明,椰壳纤维的基原纤直径为6nm~10nm,长度为0.5μm~1.5μm;其微原纤直径为20nm~40nm,长度为1μm~4.5μm。X-ray衍射结果表明椰壳纤维的结晶形式为纤维素Ⅰ型,次氯酸钠-氢氧化钠溶液能更有效地分离提取纳米纤维素晶须,且该纳米晶须的结晶度约为52%。红外显微镜结果表明纳米纤维素晶须结晶度值的提高是因为木质素、半纤维素以及杂质的减少,实验用纤维素、半纤维素和木质素的含量分别约为40.16%,39.96%和19.88%。

Preparation of Nanocellulose Whiskers of Coir Fiber by Oxidation Method

The resource of coir fiber is very rich while its comprehensive utilization rate is very low.Nanocel-lulose whiskers ( NCWs) of coir fiber were prepared by oxidation method.The result of TEM observation showed the diameter of protofiber was 6~10 nm and length was 0.5~1.5 μm; the diameter of microfiber was 20~40 nm and length was 1~4.5 μm.The result of X-ray diffraction measurement showed the crystallization type of coir fiber was celluloseⅠand the sodium hypochlorite-sodium hydroxide solution was more efficient to extract nanocellulose whiskers from coir fiber and the crystallinity was about 52%.The result of infrared microscope showed that the value of crystallinity of nanocelluloe whiskers increased because of the decrease of lignin, hemi-cellulose and impurity.The content of cellulose, hemicellulose and lignin used in the experiment were 40.16%, 39.96%and 19.88%respectively.