期刊
CARBOHYDRATE POLYMERS
卷 192, 期 -, 页码 184-192出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2018.03.042
关键词
Cellulose nanocrystal; Tetra pak; Cellulose I and II; Sulfuric acid hydrolysis; X-ray diffraction
资金
- Guangdong Provincial Department of Science and Technology [2014B050505019, 2017A050501030]
- Bureau of Guangdong Forestry [4900-F16304]
Polymorphism is an important factor associated with the cellulose nanomaterial properties. In this study, cellulose fibers (CFs) were efficiently isolated from waste Tetra pak packages, and cellulose I and II nanocrystals were produced by treatment of CFs with 64% sulfuric acid and controlling the reaction time from 15 to 30 min. Cellulose I (CI) was partially converted to cellulose II (CII) within 15 min and the resulting cellulose nanocrystal product (i.e. CNC15) contained 93.2% CII. Further extending the hydrolysis time decreased the CII content of CNC20 to 25.5% and CNC30 was completely CI without CII. CNC15 (285.1 +/- 120.7 nm long, 50.6 +/- 16.5 nm wide, 0.64 at% sulfur) was much thicker, slightly longer, less thermal stable and contained more sulfate groups than CNC30 (207.2 +/- 77.8 nm long, 23.2 +/- 7.8 nm wide, 0.34 at% sulfur). CNCs with controllable allomorph may have potentially diverse applications.
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