One-step Green Preparation of Cellulose Ⅱ Nanocrystals
Cellulose Ⅱ nanocrystal(CNC-Ⅱ)is the most thermodynamically stable crystal-line structure of cellulose nanocrystal in various crystal forms,which is expected to meet the needs of high temperature environment.In view of the complicated preparation methods of CNC-Ⅱ,expensive or toxic reagents and other problems,this paper developed a one-step green preparation method of CNC-Ⅱ by using potassium ferrate to oxidize cotton pulp cellu-lose,which has strong oxidability in alkaline environment.By studying the effect of alkali concentration on crystal transformation and yield,the optimum alkali concentration was de-termined to be 5 mol·L-1.SEM characterization results showed that CNC-Ⅱ was granular morphology.FT-IR results showed that the characteristic peak of CNC-Ⅱ appeared at 3 492 and 3 445 cm-1.TG characterization results showed that the thermal stability of CNC-Ⅱwas much higher than that of polymorph Ⅰ CNC-OSO-3 by common acid hydrolysis method.
cellulose nanocrystalpolymorph Ⅱone-step green preparation
NETL
NSTL
万方数据
