A kind of efficient preparation method of cellulose nanocrystal

Abstract

The invention provides an efficient and quick cellulose nanocrystalline preparing method.According to the method, a cellulose raw material is pretreated with aqueous alkali and then subjected to acidolysis, and inorganic salt containing metal ions is added during acidolysis to serve as a promoter to promote acidolysis reaction.Reaction condition is mild and easy to control, raw materials needed by reaction are simple and easy to obtain, and the method can be widely applied to preparation of cellulose nanocrystalline from various cellulose raw materials.

Description

【Technical field】

[0001] The invention belongs to the field of nanomaterial preparation and also belongs to the field of macromolecules, in particular to a method for preparing cellulose nanocrystals. 【Background technique】

[0002] Natural cellulose is the most abundant biomass material in nature, and its annual output can reach 1.5×10 12 Ton. Cellulose nanocrystals with nanometer size can be obtained by extracting the crystalline regions of cellulose. Cellulose nanocrystals have many excellent properties, such as it has a large aspect ratio, and the length varies from hundreds of nanometers to several microns; it has high mechanical strength, and its Young's modulus is similar to that of aramid fibers It is higher than steel, and its tensile strength is similar to that of aluminum; cellulose nanocrystals have good thermal stability, and the thermal expansion coefficient is generally below 0.1ppm / K, which is comparable to carbon fiber. Cellulose nanocrystals can be orien...

Images