木质素结构在聚丙烯中抗氧化作用的影响  

Effect of Lignin Structure on Antioxidation in Polypropylene

作　　者：郑秋闿 范晶晶[2] 许凯[3] 陈鸣才[3] 

机构地区：[1]潍坊学院化学化工与环境工程学院,山东潍坊261061 [2]潍坊学院生物与农业工程学院,山东潍坊261061 [3]中国科学院广州化学研究所,广东广州510650

出　　处：《实验室研究与探索》2013年第6期8-11,共4页Research and Exploration In Laboratory

基　　金：国家星火计划项目(2012GA740030);潍坊市科技发展计划项目(20111118);潍坊学院博士基金项目(2010BS09)

摘　　要：采用氧化诱导温度测试方法,研究了添加0.2%～1.0%桦木木质素、松木木质素和玉米秆木质素的聚丙烯的抗氧化性能。结果表明,3种结构不同的木质素都有一定的抗氧化效果,其中针叶材木质素的抗氧化效果最好。通过红外光谱和核磁共振氢谱分析了各种木质素的结构,发现针叶材木质素中含有大量的愈创木基丙烷结构,而没有紫丁香基丙烷结构的存在;阔叶材木质素和草本木质素中既有愈创木基丙烷结构也有紫丁香基丙烷结构,从结构上解释了来源不同的木质素抗氧化效果不同的原因。结合不同木质素样品的红外光谱和核磁共振氢谱分析得知,羟基对木质素的抗氧化性有较大贡献。Effects of lignins extracted from cornstalk, birch and pine on antioxidantive properties of PP at the contents of 0.2% to 1.0% were investigated by testing oxidation induced temperature on DSC. The results showed that the three lignins with different structure had some effect on antioxidation, of which the lignin of coniferous wood had the best effect. The IR and ~H-NMR analysis showed that abundant guaiacylpropane units and no syringylpropane unit were found in the lignin structure of pine. Besides both guaiacylpropane and syringylpropane units were found in the lignin structure of cornstalk and birch, which could explain the difference in antioxidantive effects. The results of the IR and I H-NMR analysis indicated that hydroxyls contributed a lot to lignin antioxidant activity.

关 键 词：木质素 聚丙烯 抗氧化 氧化诱导温度 构效关系 

分 类 号：O636.2[理学—高分子化学]