椰壳纳米纤维素晶须的氧化法制备

Preparation of Nanocellulose Whiskers of Coir Fiber by Oxidation Method

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%。

The resource of coir fiber is very rich while its comprehensive utilization rate is very low. Nanocellulose 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 cellulose Ⅰand 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,hemicellulose and impurity. The content of cellulose,hemicellulose and lignin used in the experiment were 40. 16%,39. 96% and 19. 88% respectively.