微米级氧化镓铟合金微滴填充聚二甲基硅氧烷柔性介电材料的性能及仿真  

Performance and Simulation of Polydimethylsiloxane Flexible Dielectric Material Filled with Micron-Sized Gallium-Indium Oxide Alloy Droplets

作　　者：冯路 沙金[1] 陈欣[1] 吉华建 谢林生[1] 马玉录[1] Lu Feng;Jin Sha;Xin Chen;Huajian Ji;Linsheng Xie;Yulu Ma(Engineering Center of Efficient Green Process Equipment and Energy Conservation of Ministry of Education,School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]绿色高效过程装备与节能教育部工程研究中心华东理工大学机械与动力工程学院,上海200237

出　　处：《高分子材料科学与工程》2022年第1期146-152,共7页Polymer Materials Science & Engineering

摘　　要：具有高介电性和柔性的复合材料越来越多的应用在触觉传感器领域中,复合材料的介电性能和柔性对于提高触觉传感器灵敏度和实现柔性功能至关重要。目前提高复合材料介电性能主要的方法是向聚二甲基硅氧烷(PDMS)基质中填充少量的导电刚性颗粒,但是该方法降低了复合材料的柔性,引起了复合材料力学性能的下降,限制了触觉传感器的应用。在聚二甲基硅氧烷(PDMS)基质里填充经6-丙烯酰氨基己酸(6-AHA)氧化的微米级液态金属镓铟合金(EGaIn)微滴制备了PDMS/EGaIn复合材料,分析了PDMS/EGaIn复合材料中EGaIn微滴的微观形貌,研究了PDMS/EGaIn复合材料的力学性能和介电性能,对PDMS/EGaIn复合材料应用在触觉传感器上的性能进行了仿真与分析。结果表明,在PDMS基质中填充微米级液态金属EGaIn微滴可以有效提高PDMS/EGaIn复合材料的介电性能。相较于纯PDMS,PDMS/EGaIn复合材料的力学性能不会明显降低,同时实现了较高的柔性。在一定范围内,PDMS/EGaIn复合材料中EGaIn含量增加可以提高传感器输出电容的响应能力,同时PDMS/EGaIn复合材料相对厚度增大并不会使传感器输出电容响应能力持续增加,相对厚度在0.4~0.6之间是一个合理值。Composite materials with high dielectric properties and flexibility are more and more used in the field of tactile sensors.The dielectric properties and flexibility of composite materials are very important to improve the sensitivity and achieve flexible functions of tactile sensors.At present,the main method to improve the dielectric properties of composites is to fill a small amount of conductive rigid particles into the matrix of polydimethylsiloxane(PDMS).However,this method reduces the flexibility of composites,causes the mechanical properties of composites to decrease and limits the application of tactile sensors.In this paper,PDMS/EGaIn composites were prepared by filling micro-droplets of liquid metal eutectic indium gallium(EGaIn)oxidized by 6-acrylamidohexanoic acid(6-AHA)into the PDMS matrix,analyzing the micro-morphology of EGaIn droplets in PDMS/EGaIn composites,studying the mechanical and dielectric properties of PDMS/EGaIn composites,and simulating and analyzing the properties of PDMS/EGaIn composites applied in tactile sensors.The results show that the dielectric properties of PDMS/EGaIn composites can be effectively improved by filling the PDMS matrix with micro-droplets of liquid metal EGaIn.Compared with pure PDMS,the mechanical properties of PDMS/EGaIn composites are not significantly reduced,and the high flexibility is achieved.In a certain range,the increase of EGaIn content in PDMS/EGaIn composite materials can improve the response ability of sensor output capacitance,while the increase of relative thickness of PDMS/EGaIn composite materials will not cause the continuous increase of sensor output capacitance response ability,which is a reasonable value between 0.4 and 0.6.

关 键 词：聚二甲基硅氧烷 微米级镓铟合金液滴 复合材料 触觉传感器介电层 

分 类 号：TB33[一般工业技术—材料科学与工程]