摘要
采用紫外光谱、红外光谱、元素分析、顶空气相色谱和电位滴定法研究了玉米秸秆酶解木质素的化学结构,发现酶解木质素芳香环上取代基较多,β-O-4等结构断裂程度不大,结构单元主要为H型单元,甲氧基、酚羟基和羧基含量分别为6.50%、0.48%和2.46%.将此木质素与环氧树脂共混制备酶解木质素/环氧树脂复合材料,发现:一定用量范围内的酶解木质素可提高复合材料的拉伸强度和弯曲强度;木质素用量增大时,复合材料耐热性能提高;温度为460℃时,掺2.0%酶解木质素的环氧树脂复合材料的残余量为8.3%,而纯环氧树脂的残余量为4.4%.文中结果表明,酶解木质素可提高环氧树脂的力学性能和耐热性能,在环氧树脂中具有较好的应用前景.
The chemical structure of the enzymatic hydrolysis lignin（ EHL） from corn stover was characterized by means of UV spectroscopy,infrared spectroscopy,elemental analysis,headspace gas chromatography and potentiometric titration. It is found that there exist more substituents in the aromatic ring of the EHL,and β-O-4 linkage is of lower fracture degree,and that,the main structural unit was H-type,and the methoxy group,phenolic hydroxyl group and carboxyl contents of the EHL are respectively 6. 50%,0. 48% and 2. 46%. By mixing the lignin and the epoxy resin to prepare the EHL/epoxy resin composite,it can be concluded that the EHL within a certain dosage can improve the tensile strength and bending strength of the EHL/epoxy resin composite,and the heat resistance of the EHL/epoxy resin composite increases with the EHL dosage,and that at 460 ℃,the residual amount of the epoxy resin composite containing 2. 0% EHL is 8. 3%,while the residual amount of pure epoxy resin is only4. 4%. The above-mentioned results show that the EHL can improve the mechanical properties and heat resistance of epoxy resin significantly,so it has a good application prospect in epoxy resin composites.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第11期26-32,共7页
Journal of South China University of Technology(Natural Science Edition)
基金
国家重点基础研究发展计划项目(2012CB215302)
国家自然科学基金资助项目(21376100)
国家国际科技合作专项(2013DFA41670)~~
关键词
酶解木质素
化学结构
环氧树脂
拉伸强度
耐热性能
enzymatic hydrolysis lignin
chemical structure
epoxy resin
tensile strength
heat resistance
