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Preparation, Structure and Properties of Acid Aqueous Solution Plasticized Thermoplastic Chitosan

1
Hubei Key Laboratory of Purification and Application of Plant Anti-Cancer Active Ingredients, School of Chemistry and Life Sciences, Hubei University of Education, Wuhan 430205, China
2
Institute of Materials Research and Engineering (IMRE), Hubei University of Education, Wuhan 430205, China
3
Hubei Engineering Technology Research Center of Environmental Purification Materials, Hubei University of Education, Wuhan 430205, China
4
State Key Laboratory of Magnetic Resonance and Atomic Molecular Physics, Wuhan Center for Magnetic Resonance, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(5), 818; https://doi.org/10.3390/polym11050818
Received: 16 March 2019 / Revised: 24 April 2019 / Accepted: 26 April 2019 / Published: 7 May 2019
(This article belongs to the Special Issue Processing and Molding of Polymers)
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Abstract

This work provides a simple method for the preparation of thermoplastic chitosan using the most common dilute inorganic and organic acids in aqueous solutions, namely hydrochloric acid (HCl) and acetic acid (HAc). The melting plasticization behavior of chitosan under different concentrations and types of acid solution was investigated. By means of infrared spectra (IR), scanning electron microscope (SEM), X-ray diffraction (XRD), and other characterization methods, as well as a mechanical property test, it was found that as the acid solution concentration increased, the protonation effect was stronger and the plasticization performance showed a better trend. The structure and performance of the modified chitosan were optimal when the concentration of HCl was around 8 wt %. In addition, it was found that HCl had a better effect on the plasticization of chitosan than HAc, which was because the protonation ability of HCl was stronger than that of HAc. Unlike the casting method, the structure and properties of chitosan sheets prepared by thermoplastic processing were directly affected by protonation, however not by the interaction of anionic-cationic electrostatic attractions between the –NH3+ groups of chitosan chains and the carboxyl groups of acetic acids or the chloridoid groups of hydrochloric acid. View Full-Text
Keywords: chitosan; thermoplastic process; plasticizer; protonation chitosan; thermoplastic process; plasticizer; protonation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Zhang, Y.; Liu, B.-L.; Wang, L.-J.; Deng, Y.-H.; Zhou, S.-Y.; Feng, J.-W. Preparation, Structure and Properties of Acid Aqueous Solution Plasticized Thermoplastic Chitosan. Polymers 2019, 11, 818.

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