用于脑电图监测的石墨烯/聚丙烯酸共聚酯/织物复合电极的制备与性能

为制备脑电检测用聚合物基柔性复合电极片，以石墨烯、丙烯酸(AA)、丙烯酸甲酯(MA)和丙烯酸乙酯(EA)为原料，通过原位聚合的方法制得了系列聚丙烯酸共聚酯/石墨烯复合乳液，并通过与织物浸渍的方法制备了复合电极片。研究了石墨烯含量变化对复合电极片电阻的影响、各单体含量对电极片柔性的影响，以及复合电极片用于脑电监测的性能。结果表明，当石墨烯的质量分数约为46.5%、反应温度80 ℃，反应时间3 h，AA、MA与EA的体积投料比为0.2∶1∶1.8，织物采用聚丙烯无纺布并与聚丙烯酸共聚酯复合乳液浸渍后，制备的复合电极片在室温下具有良好的柔性、导电及力学强度，适合用于脑电图监测，脑电信号强度及其稳定性与商用电极（Ag/AgCl）相比性能相近，且不需要涂抹导电膏，使用方便，不会污染皮肤及对皮肤造成损伤。

Preparation and Applications of Polyacrylic Copolyester/Graphene/Fabric Composite as Brain Electrode Materials

A series of poly(acrylic acid)copolyester/graphene latices were prepared by in-situ polymerization using graphene,acrylic acid(AA),methyl acrylate(MA)and ethyl acrylate(EA)as raw materials,and a composite electrode sheet was prepared by a fabric impregnation method. The effects of graphene and monomer contents on the electrical conductivity,flexibility,mechanical properties and electroencephalography(EEG)monitoring performance of the composite electrode sheet were investigated by using Ohm meter,differential scanning calorimetry,universal material testing machine and EEG tester,and its morphology was observed by scanning electron microscopy. The results indicated that the prepared composite electrode sheet exhibited good flexibility at a graphene content of 46. 5 wt%,a reaction temperature of 80 °C,a reaction time of 3 h,and an AA/MA/EA volume ratio of 0. 2/1/1. 8. In this composite electrode sheet,and the fabric was made from the non-woven fabric impregnated by copolyester emulsion. This composite electrode sheet exhibits good electrical conductivity and mechanical strength at room temperature and is suitable for the use in EEG monitoring,and its signal intensity and stability for EEG is similar to the commercial Ag/AgCl electrode. There is no conductive paste needed for this composite electrode,so it is more convenient for use without any skin contact.