Effects of lactic acid and mixed acid aqueous solutions on the preparation, structure and properties of thermoplastic chitosan
Effects of lactic acid and mixed acid aqueous solutions on the preparation, structure and properties of thermoplastic chitosan
复制标题
乳酸及混酸水溶液对热塑性壳聚糖制备、结构及性能的影响
DOI：
10.1016/j.eurpolymj.2020.109850
复制
发表时间：
2020-07-05
影响因子：
6
通讯作者：
Zhang, Yu
中科院分区：
文献类型：
--
作者：
Dou, Xiaoya;Li, Qian;Zhang, Yu
本文以乳酸（LA）水溶液和由乳酸和盐酸（HCl）组成的混酸（MA）水溶液为增塑剂，对热塑性壳聚糖进行了增塑剂。研究了不同浓度的LA和MA溶液以及不同配比的HCl和LA对壳聚糖熔融加工的塑化性能。扫描电镜（SEM）和x射线衍射（XRD）分析表明，酸溶液的酸度和浓度对壳聚糖的结构有直接影响。随着LA溶液中乳酸浓度和MA溶液中HCl浓度的增加，壳聚糖的热熔效果得到改善。通过改变MA溶液中盐酸和乳酸的比例，可以调节热塑性壳聚糖的片材透光性、疏水性、热稳定性和力学性能。扩充了酸溶液改性热塑性壳聚糖的理论知识。
In this paper, a lactic acid (LA) aqueous solution and a mixed acid (MA) aqueous solution, composed of lactic acid and hydrochloric acid (HCl), were used as plasticizers to plasticize thermoplastic chitosan. The plasticizing behavior of chitosan under melt processing with different concentrations of the LA and MA solutions and different ratios of HCl and LA were studied. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) indicated that the acidity and concentration of the acid solution had direct impacts on the chitosan structure. The thermal melting effect of chitosan was improved with increasing lactic acid concentration in the LA solution and HCl concentration in MA solution. The sheet light transmission, hydrophobicity, thermal stability and mechanical properties of thermoplastic chitosan could be adjusted by changing the ratios of hydrochloric acid and lactic acid in the MA solution. This work expanded the theoretical knowledge of acid solution modified thermoplastic chitosan.