NDLI: High strength films with gas-barrier fabricated from chitin solution dissolved at low temperature

Content Provider	Royal Society of Chemistry (RSC)
Author	Du, Yumin Cai, Jie Chang, Chunyu Xu, Min Ren, Jizhong Zhang, Lina Feng, Shichao Shi, Xiaowen Ding, Beibei Duan, Bo
Copyright Year	2013
Abstract	The fabrication of pure chitin materials remains a challenge due to the difficult dissolution and regeneration of chitin. It has been a stumbling block for chitin research and utilization. In this work, chitin was dissolved completely in 11 wt% NaOH–4 wt% urea aqueous solution via the freezing/thawing method without derivatization, as supported by 13C NMR spectra. The pure regenerated chitin films with high strength were successfully prepared from the transparent chitin solution by coagulating with ethanol or 45 wt% dimethylacetamide (DMAc) aqueous solution. The influences of the interactions between the chitin solution and coagulants on the structure and properties of the chitin films were investigated by UV, FT-IR spectra, scanning electron microscopy, X-ray diffraction, nitrogen adsorption isotherms, thermo-gravimetric analysis and tensile testing, indicating the good coagulating condition. The dissolution and regeneration of chitin was confirmed to be an entirely physical processes. The chitin films possessed homogeneous structure, high optical transmittance (87% at 800 nm), moderate thermal stability, as well as excellent tensile strength (up to 111 MPa). Moreover, these chitin films had good gas barrier properties (0.003 barrer for oxygen permeability), indicating great potentials in the materials field. This work would open up a completely new avenue with green technology to investigate the most intransigent chitin.
Starting Page	1867
Ending Page	1874
Page Count	8
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	1
Issue Number	5
Journal	Journal of Materials Chemistry A
DOI	10.1039/c2ta00068g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Chitin Urea Nuclear magnetic resonance Ethanol Dimethylacetamide Fourier-transform infrared spectroscopy Scanning electron microscope X-ray crystallography Nitrogen Adsorption Ultimate tensile strength Oxygen Semipermeable membrane
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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