In order to improve the interface bond strength,the surface of silica nanoparticles was modified by using silane coupling agent method.The modified nanoparticles were added to soluble polyimide(PI) solution,and then mixed by high-speed mechanical stirring and ball milling.Based on the well dispersed and processed solution,a series of flexible PI hybrid films with different modified nanoSiO content were prepared.The effects of nanoSiO nanoparticle contents and surface modification on the thermal,optical,dielectric and mechanical properties of the films were investigated.The results shown that the interface compatibility of nanoSiO nanoparticles and PI matrix was enhanced due to their surface modification,and the dispersion of modified nanoparticles in the matrix was also improved because of the efficient mixing process.With the amount of nanoSiO nanoparticles increasing,the thermal dimensional stability,optical anisotropy and dielectric properties of the films were all significantly improved.The thermal expansion coefficient of the films decreased dramatically with the increase of nanoSiO content.Meantime,the films could maintain good optical transmittance in the visible light region and relatively low turbidity.The decrease changes of the tensile strength and elongation at break became significantly slow.The films can be widely used as flexible substrate materials for the wearable electrochemical sensors.
[1] Yang G,Pang G Y,Pang Z B,et al.Non-invasive flexible and stretchable wearable sensors with nano-based enhancement for chronic disease care[J].IEEE Reviews in Biomedical Engineering,2019,12:34-71.
[2] Xuan X,Yoon H S,Park J Y.A wearable electrochemical glucose sensor based on simple and low-cost fabrication supported micro-patterned reduced graphene oxide nanocomposite electrode on flexible substrate[J].Biosensors and Bioelectronics,2018,109:75-82.
[3] Bujes-Garrido J,Arcos-Martinez M J.Development of a wearable electrochemical sensor for voltammetric determination of chloride ions[J].Sensors and Actuators B:Chemical,2017,240:224-228.
[4] Yoon H,Xuan X,Jeong S,et al.Wearable,robust,non-enzymatic continuous glucose monitoring system and its in vivo investigation[J].Biosensors and Bioelectronics,2018,117:267-275.
[5] Martin A,Kim J,Kurniawan J F,et al.Epidermal microfluidic electrochemical detection system:enhanced sweat sampling and metabolite detection[J].ACS Sensors,2017,2(12):1860-1868.
[6] 王志勇,汪韬,庄梦迪,等.功能高分子材料在柔性电子领域研究进展[J].中国科学技术大学学报,2019,49(11):878-891.
[7] Bae W J,Kovalev M K,Kalinina F,et al.Towards colorless polyimide/silica hybrids for flexible substrates[J].Polymer,2016,105:124-132.
[8] Tsai C L,Yen H J,Liou G S.Highly transparent polyimide hybrids for optoelectronic applications[J].Reactive and Functional Polymers,2016,108:2-30.
[9] 鲁云华,康文娟,胡知之,等.柔性透明导电膜衬底材料的研究进展[J].化工新型材料,2010,38(9):27-29.
[10] 陈银珊,候琼,罗穗莲,等.聚酰亚胺/SiO2杂化薄膜的研究进展[J].化工新型材料,2014,42(1):19-23.
[11] Akram S,Castellon J,Agnel S,et al.Multilayer polyimide nanocomposite films synthesis process optimization impact on nanoparticles dispersion and their dielectric performance[J].Journal of Applied Polymer Science,2021,138(4):49715(1-15).
[12] 徐锦泱,刘雷,罗建伟,等.聚酰亚胺的填充改性研究进展[J].化工新型材料,2010,38(5):17-19.
[13] 李亮荣,钟永红,曾晶晶,等.基于不同粒子改性聚酰亚胺膜的研究进展[J].化工新型材料,2015,43(12):9-11.
[14] Loste J,Lopez-Cuesta J M,Billon L,et al.Transparent polymer nanocomposites:an overview on their synthesis and advanced properties[J].Progress in Polymer Science,2019,89:133-158.
[15] 丁成成,俞娟,王晓东,等.交联剂对聚酰亚胺/SiO2复合多孔膜结构和性能的影响[J].化工新型材料,2020,48(10):87-91.
[16] 朱卫红,黄杰,冉晨鑫,等.介孔氧化硅改性聚酰亚胺材料的性能及其应用研究[J].化工新型材料,2014,42(1):166-168.
[17] Kim S K,Ando S,Wang X G.Ternary composites of linear and hyperbranched polyimides with nanoscale silica for low dielectric constant,high transparency,and high thermal stability[J].RSC Advances,2015,5:40046-40054.
[18] 徐佳,董杰,赵昕,等.溶胶-凝胶法制备聚酰亚胺/SiO2杂化薄膜及其性能研究[J].化工新型材料,2019,47(3):71-75.
[19] Choi C H,Sohn B H,Chang J H,et al.Colorless and transparent polyimide nanocomposites:comparison of the properties of homo- and co-polymers[J].Journal of Industrial and Engineering Chemistry,2013,19:1593-1599.
[20] Ma P C,Dai C T,Wang H Z,et al.A review on high temperature resistant polyimide films:heterocyclic structures and nanocomposites[J].Composites Communications,2019,16:84-93.
[21] Shen J J,Zhang D G,Liu X.Facile fabrication of high-performance polyimide nanocomposites with in situ formed “impurity-free” dispersants[J].Chinese Journal of Polymer Science,2016,34(5):532-541.
基金资助
2019年辽宁省自然科学基金指导计划项目(2019-ZD-0371);营口理工学院2021年大学生创新创业训练计划项目(X202114435075)
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