Zhao Xiaohong, Zhang Yanjuan, Hu Huayu, Huang Zuqiang, Yang Mei, Chen Dong, Huang Kai, Huang Aimin, Qin Xingzhen, Feng Zhenfei
School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China; College of Chemistry and Biology Engineering, Hezhou University, Hezhou 542899, China.
School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China; State Key Laboratory of Non-Food Biomass and Enzyme Technology, Guangxi Academy of Sciences, Nanning 530007, China.
Int J Biol Macromol. 2016 Oct;91:1081-9. doi: 10.1016/j.ijbiomac.2016.06.074. Epub 2016 Jun 23.
Lignin was treated by mechanical activation (MA) in a customized stirring ball mill, and the structure and reactivity in further esterification were studied. The chemical structure and morphology of MA-treated lignin and the esterified products were analyzed by chemical analysis combined with UV/vis spectrometer, FTIR,NMR, SEM and particle size analyzer. The results showed that MA contributed to the increase of aliphatic hydroxyl, phenolic hydroxyl, carbonyl and carboxyl groups but the decrease of methoxyl groups. Moreover, MA led to the decrease of particle size and the increase of specific surface area and roughness of surface in lignin. The reactivity of lignin was enhanced significantly for the increase of hydroxyl content and the improvement of mass transfer in chemical reaction caused by the changes of molecular structure and morphological structure. The process of MA is green and simple, and is an effective method for enhancing the reactivity of lignin.
木质素在定制的搅拌球磨机中通过机械活化（MA）进行处理，并对其在进一步酯化反应中的结构和反应活性进行了研究。采用化学分析结合紫外可见光谱仪、傅里叶变换红外光谱仪、核磁共振仪、扫描电子显微镜和粒度分析仪对经机械活化处理的木质素及其酯化产物的化学结构和形态进行了分析。结果表明，机械活化导致脂肪族羟基、酚羟基、羰基和羧基含量增加，而甲氧基含量减少。此外，机械活化使木质素的粒径减小，比表面积和表面粗糙度增大。由于分子结构和形态结构的变化导致羟基含量增加以及化学反应中传质的改善，木质素的反应活性显著增强。机械活化过程绿色且简单，是提高木质素反应活性的有效方法。
