Phung Hai Thien An, Sugimoto Ryuichi
School of Environmental Science and Engineering, Kochi University of Technology Miyanokuchi, Tosayamada Kami Kochi 782-8502 Japan
RSC Adv. 2018 Feb 13;8(13):7005-7013. doi: 10.1039/c8ra00287h. eCollection 2018 Feb 9.
The copolymer of 3-hexylthiophene (3HT) and fluorene (F) was directly grafted onto chitin and chitosan using FeCl as an oxidant. The properties of the grafted chitin/chitosan were characterized by Fourier transform infrared (FT-IR) spectroscopy, UV-Vis spectroscopy, fluorescence spectroscopy, X-ray diffraction analysis, thermogravimetric analysis (TGA), transmission electron microscopy-energy dispersive X-ray spectroscopy, and quantum yield measurements. The UV-Vis absorption peaks of the chitin/chitosan grafted with 3-hexylthiophene and fluorene copolymer were increasingly blue-shifted upon increasing the fluorene content and the red-shifted emission of the grafted chitin/chitosan were controlled by varying the monomers feed of the 3HT/F units. The hypsochromic and bathochromic shifts of chitin/chitosan were ascribed to the (3HT/F) moieties grafted to their surface. The quantum yield of grafted chitin/chitosan increased upon increasing the fluorene content. The TGA and XRD analysis revealed that the thermal stability and crystallinity of chitin/chitosan decreased upon grafting the copolymer of fluorene and 3-hexylthiophene. This article represents a simple route towards the surface modification of chitin and chitosan using conducting copolymers, providing multicolor chitin and chitosan a one-step reaction.
以氯化铁作为氧化剂，将3-己基噻吩（3HT）与芴（F）的共聚物直接接枝到甲壳素和壳聚糖上。通过傅里叶变换红外光谱（FT-IR）、紫外可见光谱、荧光光谱、X射线衍射分析、热重分析（TGA）、透射电子显微镜-能量色散X射线光谱以及量子产率测量等手段对接枝后的甲壳素/壳聚糖的性能进行了表征。随着芴含量的增加，接枝了3-己基噻吩和芴共聚物的甲壳素/壳聚糖的紫外可见吸收峰逐渐发生蓝移，并且通过改变3HT/F单元的单体进料量可以控制接枝后的甲壳素/壳聚糖的红移发射。甲壳素/壳聚糖的紫移和红移归因于接枝到其表面的（3HT/F）部分。随着芴含量的增加，接枝后的甲壳素/壳聚糖的量子产率提高。热重分析和X射线衍射分析表明，接枝芴和3-己基噻吩的共聚物后，甲壳素/壳聚糖的热稳定性和结晶度降低。本文介绍了一种使用导电共聚物对甲壳素和壳聚糖进行表面改性的简单方法，通过一步反应即可实现甲壳素和壳聚糖的多色化。
