A comprehensive investigation on cellulose nanocrystals with different crystal structures from cotton via an efficient route
writer：Chengling Huang，Houyong Yu，Somia Yassin Hussain Abdalkarim，Yingzhan Li，Xiang Chen，Xiaogang Yang
keywords：Cellulose nanocrystals; polymorph; morphology; thermal stability
source：期刊
Issue time：2021年
The crystal structures of cellulose nanomaterials play an important role in their
morphologies and applications, however, there was still lacking systematic research
on preparing various crystalline allomorphs of cellulose nanocrystals with high
thermal stability. Herein, the efficient synthesis route was presented to design various
crystalline allomorphs of cellulose from cotton. And then, cellulose nanocrystals with
different crystal structures (CNC-I, CNC-II, CNC-IIIII, CNC-IVII) were prepared by
hydrogen peroxide hydrolysis of resultant cellulose. Overall, needle-like CNC-I
(length of 180±25 nm, diameter of 12±2 nm), near-spherical CNC-II (diameter of
101±12 nm), and spherical CNC-IIIII (diameter of 22±3 nm) and CNC-IVII (diameter
of 21±2 nm) all exhibited remarkable dispersibility and thermal stability (Tmax>357
℃). This work provides a simple and low-cost synthesis route for various crystalline
allomorphs of CNCs with high thermal stability from the same raw materials (cotton).