Preparation, Structure and Properties of Acid Aqueous Solution Plasticized Thermoplastic Chitosan
Preparation, Structure and Properties of Acid Aqueous Solution Plasticized Thermoplastic Chitosan
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酸性水溶液增塑热塑性壳聚糖的制备、结构与性能
DOI：
10.3390/polym11050818
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发表时间：
2019-05-01
期刊：
影响因子：
5
通讯作者：
Feng, Ji-Wen
中科院分区：
文献类型：
--
作者：
Zhang, Yu;Liu, Biao-Lan;Feng, Ji-Wen
本工作提供了一种利用水溶液中最常见的稀无机酸和有机酸即盐酸(HCl)和醋酸(HAc)制备热塑性壳聚糖的简单方法。研究了壳聚糖在不同浓度和类型的酸溶液中的熔融塑化行为。通过红外光谱、扫描电子显微镜、X射线衍射仪等表征手段以及力学性能测试，发现随着酸液浓度的增加，质子化作用越强，塑化性能呈现出较好的趋势。当盐酸浓度在8wt%左右时，改性壳聚糖的结构和性能最佳。此外，还发现HCl对壳聚糖的增塑效果优于HAc，这是因为HCl的质子化能力比HAc强。与铸造法不同，热塑性工艺制备的壳聚糖片的结构和性能直接受到质子化作用的影响，而不是壳聚糖链上的-NH3+基团与醋酸的羧基或盐酸的类氯基团之间的阴阳离子静电引力的相互作用。
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.