摘要
本实验对毛竹碱木素和毛竹木质素酚分别进行羟甲基化改性,并改变木质素和甲醛反应比例进行对比实验,通过红外光谱法(FT-IR)、凝胶渗透色谱法(GPC)和二维核磁(2D-HSQC NMR)等分析手段对羟基化改性前后的毛竹碱木素和毛竹木质素酚进行表征,发现在改性前两者几乎相同的分子量特征下,改性后相比于碱木素,木质素酚重量平均分子量和分散比变化明显,说明相同反应条件下木质素酚发生羟甲基化的位点多,效果优于碱木素;保持甲醛用量不变,随着木质素酚用量加大,其羟甲基化效果增强。
In this study, bamboo lignophenols（LPs） and alkaline lignins（ALs） were respectively modified by hydroxymethylation and reaction ratios of LPs and methanal were changed for contrast experiment. The characteristics of bamboo LPs and ALs unmodified and modified by hydroxymethylation were compared using Fourier transform infrared spectroscopy（FT-IR）, gel permeation chromatography（GPC） and 2D（HSQC） nuclear magnetic resonance（2D-HSQC NMR）. It showed that LPs and ALs has almost the same molecular weight before modification, but the average molecular weight and dispersion of LPs changed more obviously compared with ALs after modification. It indicated that the more ref lex points and the better modification happen on LPs compared with ALs under the same reaction condition. The effect of hydroxymethylation enhanced with the same dosage of methanal and the increased dosage of LPs.
出处
《中华纸业》
CAS
2015年第24期22-27,共6页
China Pulp & Paper Industry
基金
2014江苏省高校"青蓝工程优秀青年骨干教师"项目
南京林业大学高层次人才引进科研启动基金(163105017)
青年拔尖人才基金(163105071)项目
关键词
毛竹
木质素酚
碱木素
羟甲基化
bamboo
lignophenols
alkaline lignins
hydroxymethylation
