Abstract
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.
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