Synthesis and characterization of water-soluble PEGylated lignin-based polymers by macromolecular azo coupling reaction

作     者：Jilei Wang Shang Li Ruiqi Liang Bing Wu Yaning He 

作者机构：Department of Chemical Engineering Key Laboratory of Advanced Materials (MOE) Tsinghua University 

出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)

年 卷 期：2018年第29卷第1期

页      面：143-146页

核心收录：

学科分类：07[理学] 0703[理学-化学] 

基　　金：financial support from the National Natural Science Foundation of China (Nos.21474056.21674058) Fund of Key Laboratory of Advanced Materials of Ministry of Education(No. 2017AML03) 

主　　题：Lignin based polymersWater solubleMacromolecular azo coupling reactionColloid particlesNanofibers 

摘      要：Water-soluble PEG grafted lignin-based polymers （AL-azo-PEG） were efficiently synthesized by macromolecular azo coupling reaction between alkali lignin and PEG based macromolecular diazonium salts in alkaline water. This one-step PEGylation method showed many advantages such as high efficiency, controllable grafting radio, extremely mild conditions and without organic solvents. The prepared AL-azo-PEG polymers were well characterized by using various spectroscopic methods including UV-vis, FTIR and 1H NMR spectra. Experimental results showed that the synthesized polymers had good solubility both in water over a wide pH range （pH 2-12） and in the majority of organic solvents, which helped to easily fabricate self-assembly colloidal particles and nanofibers by vapor diffusion method and electrospinning method, respectively, The azobenzene linkages generated by the macromolecular azo coupling reaction also brought photo-responsive properties to the prepared polymers.