Li Tong, Du Juan, Xu Mi, Song Zhuoyu, Ren Mingfa
Department of Engineering Mechanics, Dalian University of Technology, Dalian 116024, China.
State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, China.
Nanomaterials (Basel). 2022 Apr 8;12(8):1260. doi: 10.3390/nano12081260.
As an elastomer, PDMS can effectively suppress vibration in various fields in a certain temperature range by its viscoelastic behavior in the vitrification transition region, but the vibration isolation effect is poor at high temperature. In this paper, a three-dimensional graphene oxide (GO) foam is fabricated by solution processing method and freeze-drying techniques. After sequential infiltration synthesis, a GO-foam-reinforced PDMS nanocomposite (GO/PDMS) is fabricated with improved damping ability. By adjusting the content of GO, the micros-tructure of GO foam can be sensitively changed, which is crucial to the damping properties of composites. In this paper, by the dynamic mechanical analysis (DMA) of pure PDMS and five kinds of GO/PDMS composites, it is proved that the GO/PDMS composites developed in this work have reliable elasticity and viscoelasticity at 25 °C, which is 100 °C higher than the applicable temperature of pure PDMS. The storage modulus can reach 3.58 MPa, and the loss modulus can reach 0.45 MPa, which are 1.87 times and 2.0 times of pure PDMS, respectively. This GO-based nanocomposite is an ideal candidate for damping materials in passive vibration isolation devices.
作为一种弹性体，聚二甲基硅氧烷（PDMS）在玻璃化转变区域的粘弹性行为使其能够在一定温度范围内有效抑制各个领域的振动，但在高温下隔振效果较差。本文采用溶液处理法和冷冻干燥技术制备了三维氧化石墨烯（GO）泡沫。经过顺序渗透合成，制备了具有改进阻尼能力的GO泡沫增强PDMS纳米复合材料（GO/PDMS）。通过调整GO的含量，可以灵敏地改变GO泡沫的微观结构，这对复合材料的阻尼性能至关重要。本文通过对纯PDMS和五种GO/PDMS复合材料进行动态力学分析（DMA），证明了本工作中开发的GO/PDMS复合材料在25℃时具有可靠的弹性和粘弹性，比纯PDMS的适用温度高100℃。储能模量可达3.58MPa，损耗模量可达0.45MPa，分别是纯PDMS的1.87倍和2.0倍。这种基于GO的纳米复合材料是被动隔振装置中阻尼材料的理想候选者。
