酸法制备杨木微/纳纤丝及其表征

近二十多年来,如何从天然纤维素中分离微/纳纤丝和用其来增强高分子聚合物受到许多学者的关注。本研究以杨木纤维素为原料,采用硫酸和盐酸的混合液水解、恒温水浴振荡处理制备杨木微/纳纤丝。利用扫描电子显微和X射线衍射仪对制备的杨木微/纳纤丝进行分析表征,结果表明当酸处理条件为杨木纤维3g、浓H2SO4体积分数为15%、浓HCl体积分数为5%、恒温水浴60℃、振荡8h,可得到杨木微/纳纤丝,杨木微/纳纤丝宽度分布在200nm到1μm之间,长宽比约60~120,相度结晶度为77.59%。

Preparation and Characterization of Poplar Micro/nano Fibrils by Acid

For two decades,many researchers have been devoted to isolating micro/nanofibrils from natural cellulose and using them to reinforce polymers.The sulfuric acid and hydrochloric acid were used to make the micro/nano fibrils from poplar fiber.The micro/nano fibrils was characterized by scanning electron microscopy(SEM)and X-ray diffractometer(XRD).The results indicated that the distribution of width for the micro/nano fibrils was from 200 nm to 1μm,length/width ratio was 60～120 and its crystallity was 77.59% when the volume fraction of sulfuric acid was15%,the volume fraction of hydrochloric acid was 5%,temperature was 60℃ and the time of treatment was 8h.