Journal
CARBOHYDRATE POLYMERS
Volume 195, Issue -, Pages 18-28Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2018.04.039
Keywords
Cellulose nanocrystals; Polymorph; Crystallinity; Morphology; Sulfuric acid hydrolysis; TEMPO-mediated oxidation
Categories
Funding
- National Science and Technology Major Project [2014ZX07213001, 2017ZX07402004]
- National Key Research and Development Plan [2017YFB0307902]
- Special Support Plan of Guangdong Province [2014TQ01N603]
- Guangdong provincial science & technology plan project: Collaborative Innovation Center for Cleaner Production and Refining of Light Industry and Biomass Products [x2qsB2140310]
- 111 plan [2015B020241001]
- Guangdong provincial science & technology plan projects: Research and Application of Biomass Pretreatment and Ethanol Production Technology [2015B020241001]
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Polymorphic changes of cellulose nanocrystals (CNCs) are strongly associated with its properties and applications. In this study, CNCs with different polymorphs were produced by a simple polymorphic transformation treatment. Cellulose I nanocrystals were produced by typical sulfuric acid hydrolysis (CNC-I). Cellulose II nanocrystals were prepared by two different methods: (1) sulfuric acid hydrolysis of cellulose previously mercerized with 18.5 wt% NaOH (CNC-II), (2) mercerization of CNC-I with 18.5 wt% NaOH (MCNC-II). Cellulose III nanocrystals were prepared by ethylenediamine treatment of CNC-I (ECNC-III). The polymorphic changes of CNCs, and their properties including morphology, crystallinity, thermal stability, and re-dispersion ability were systematically investigated. The results showed that the other properties of CNC-II and MCNC-II were quite different from each other except for the morphology. The morphology of polymorphic transformed CNCs were strongly relate to the fashion of cellulose chains arrangement. Both CNC-II and MCNC-II exhibited a rod-like shape with short lengths, whereas the ECNC-III showed relatively long length, like CNC-I.
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