乙烯基二茂铁、丙烯酰胺和甲基丙烯酸二甲氨基乙酯共聚物的合成及性能研究  

Synthesis and Properties of Copolymer of Vinylferrocene,Acrylamide and Dimethylaminoethyl Methacrylate

作　　者：余东栋 陆杰[1] 孙筱萌[2] 方晓[2] 李静[2] 尹应乐[1] 陈绪煌[1,3] 

机构地区：[1]湖北工业大学材料与化学工程学院,湖北武汉430068 [2]空军预警学院黄陂士官学校,湖北武汉430034 [3]绿色轻工材料湖北省重点实验室,湖北武汉430068

出　　处：《分析科学学报》2016年第6期831-835,共5页Journal of Analytical Science

摘　　要：以乙烯基二茂铁、丙烯酰胺和甲基丙烯酸二甲氨基乙酯为共聚单体,采用自由基聚合法合成了具有水溶性和氧化还原活性的聚合物,并通过示差扫描量热法、傅里叶红外光谱、紫外-可见吸收光谱,及电化学方法对其玻璃化转变温度、化学组成、质子化作用及电化学性能进行了分析。实验结果表明该共聚物为乙烯基二茂铁、丙烯酰胺和甲基丙烯酸二甲氨基乙酯三元共聚物。该共聚物具有较好的水溶性和柔性,这些特点有利于提高修饰电极电子转移的效率,以及实现酶活性中心与电极之间的直接电子转移。共聚物中的甲基丙烯酸二甲氨基乙酯结构单元在近中性的溶液中可发生质子化作用,可与酶之间形成离子键从而有利于缩短酶活性中心与电极表面之间导电路径。共聚物的电化学性能表现出良好的氧化还原可逆性,且实现了共聚物与电极之间的可逆电子转移。另外该共聚物在溶液中的扩散系数较低,有利于提高修饰电极的稳定性。Water-soluble and redox-active copolymer of vinylferrocene,acrylamide and dimethylaminoethyl methacrylate was synthesized by free radical polymerization. Tg, chemical composition, protonation and electrochemical properties of the copolymer were investigated by differential scanning calorimeter, Fourier infrared spectrometer, ultraviolet visible spectrophotometer and electrochemical work station. Experimental results imply that the synthetic product with excellent water-soluble and flexible properties is the copolymer of vinylferrocene, acrylamide and dimethylaminoethyl methacrylate. These characteristics of copolymer will contribute to improving detection limit of modified electrode,efficiency of electron transfer and to realizing direct electron transfer between enzyme＇s active centre and electrode. Protonation of the copolymer bearing dimethylaminoethyl methacrylate repeat-units will give the copolymer positive charge at pH around neutral. Therefore, the copolymer could have electrostatic interaction with glucose enzymes and hence, this change makes the distance between active centre of enzyme and electrode surface shorter. Electrochemical properties of the copolymer present excellent oxidation-reduction reversibility and realize the reversible electron transfer between copolymer and electrode. In addition, lower diffusion coefficient of copolymer in solution can help to provide modified electrode with excellent stability.

关 键 词：乙烯基二茂铁 氧化还原可逆性 水溶性 傅里叶红外光谱 

分 类 号：O657[理学—分析化学]