DPPH法研究聚烯烃抗氧剂的抗氧化能力及反应动力学  

Study on the Antioxidant Capacity and Kinetics of Polyolefin Antioxidant by Using DPPH Method

作　　者：王俊[1] 史春霞[1] 李翠勤[1] 魏宇佳[1] 

机构地区：[1]东北石油大学化学化工学院石油与天然气化工省重点实验室,黑龙江大庆163318

出　　处：《石油学报（石油加工）》2012年第6期973-977,共5页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：黑龙江省自然科学基金(B200820);黑龙江省教育厅重点项目(1251z005)资助

摘　　要：以DPPH法考察了4种聚烯烃抗氧剂对DPPH·的清除能力,并对聚烯烃抗氧剂清除DPPH.反应进行了动力学分析。结果表明,4种聚烯烃抗氧剂对DPPH·均具有良好的清除作用,清除能力随聚烯烃抗氧剂浓度的增加而升高,随清除反应时间的延长先增大后趋于稳定。抗氧化效率从大到小的4种聚烯烃抗氧剂顺序为抗氧剂1010、抗氧剂BHT、抗氧剂1076、抗氧剂1098。聚烯烃抗氧剂清除DPPH·反应属一级反应,反应温度对该清除反应的反应速率常数k及反应活化能Ea影响不显著;4种聚烯烃抗氧剂中清除能力最强的聚烯烃抗氧剂1010的反应活化能仅为7.49kJ/mol,说明这4种聚烯烃抗氧剂清除DPPH·在室温下即能快速进行。Free radical scavenging abilities of four polyolefin antioxidants were evaluated by DPPH · assay. The analysis of the scavenging reaction kinetics of the polyolefin antioxidant was carried out. The results showed that the four polyolefin antioxidants had good DPPH · scavenging abilities. The DPPH. scavenging rate of polyolefin antioxidant gradually increased with the increase of the antioxidants concentration, and increased first and then became steady along with the scavenging time. The antioxidation efficiency of the four polyolefin antioxidants from high to low was in order of antioxidant 1010, antioxidant 1098, antioxidant BHT, antioxidant 1076. The scavenging reaction of four polyolefin antioxidants to DPPH · fit a first-order kinetic reaction, and the reaction temperature has little influence on the reaction rate activation energy of the antioxidant 1010, whose constant k and the activation energy E,. The scavenging ability was strongest in the four polyolefin antioxidants, was only 7.49 kJ/mol, showing that the scavenging reaction could proceed rapidly at room temperature.

关 键 词：DPPH· 聚烯烃抗氧剂 清除自由基 抗氧化能力 动力学 

分 类 号：TQ314.249[化学工程—高聚物工业]