微波辅助羟甲基化改性木质素的制备及其结构表征

doi:10.3969/j.issn.1673-5854.2016.05.003

Abstract

Abstract: In order to improve the utilization efficiency and reactivity of lignin,the hydroxymethylate modification was carried out under microwave heating.The reaction conditions were optimized by measuring the amount of formaldehyde consumption.The optimal reaction conditions were 80℃,pH value 10.5 and reaction time 30 min.The reaction time of microwave heating could be shortened compared with the conventional method and the efficiency of the hydroxymethylate modification of lignin could be improved significantly.The lignin and modified lignin were characterized by Fourier transform infrared spectroscopy(FT-IR),nuclear magnetic resonance hydrogen spectrum(¹H NMR) and gel permeation chromatograph(GPC).The results showed that the content of hydroxyl group and reactive activity of modified lignin increased.The number-average molecular weight(M_n) and weight-average molecular weight(M_w) of acetylated hydroxymethylation lignin increased,as well as the molecular weight distribution(M_w/M_n) tended to be wider compared with those of the acetylated lignin.

Key words: lignin, microwave heating, hydroxymethylation, structural characterization

CLC Number:

TQ35

XIA Cheng-long, GUO Teng-fei, XU Yu-zhi, WANG Chun-peng. Preparation and Structural Characterization of Hydroxymethylated Lignin Assisted by Microwave Irradiation[J]. bce, 2016, 50(5): 12-16.

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Preparation and Structural Characterization of Hydroxymethylated Lignin Assisted by Microwave Irradiation

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