Research on the Synthesis and Properties of Chlorinated Enzymatic Hydrolysis Lignin

The synthesis and properties of chlorinated enzymatic hydrolysis lignin (EHL) were reported in this article. The influences of some factors on the yield and the chlorine content were investigated,including the mass ratio of lignin and water,ultraviolet,chlorination temperature and the dosage of Cl2. The results showed that the chlorinated efficiency of EHL was high under the condition that the temperature was 25℃ and without the irradiation of ultraviolet,the chlorination level could be controlled by the dosage of Cl2 and the chlorine content was increasing with the dosage of Cl2,the highest chlorine content was 29.8%. The structure of copolymer was characterized by FT-IR,and compared with EHL. The C-Cl absorbance peak appeared about 680 cm-1 in IR spectra of chlorinated lignin,which indicated that the hydrogen of phenyl rings were replaced by Cl2. Based on the TG graph,the heat-resistant of chlorinated enzymatic hydrolysis lignin was worse than that of EHL. Molecular polarity of lignin was improved by chlorination. Chlorinated EHL could be used as a compatibilizer between lignin and polar polymers.