摘要详情

ID / 提交时间

436 / 2022-08-12 13:51:00

标题

Preparation and High Temperature Damping Properties of Graphene Oxide Reinforced Polydimethylsiloxane Composites

关键字

Graphene oxide,Polydimethylsiloxane,High temperature resistance,Loss modulus

主题及专题

Vibration Isolation

状态

摘要录用

作者

Juan Du / Dalian University of Technology

Tong Li / 大连理工大学

摘要

The high temperature vibration load of spacecraft during flight and launch is a very important factor that limits the accuracy and life of equipment and instruments. Polydimethylsiloxane (PDMS) can effectively suppress vibration and noise in various fields by virtue of its viscoelastic behavior in the glass transition region. However, its glass transition temperature is low and the temperature range is narrow, which cannot meet the high-temperature vibration isolation requirements of spacecraft under launch conditions. In this study, light layered graphene oxide (GO) foam with high elasticity and energy dissipation were prepared by freeze-drying graphene oxide suspension, and GO/PDMS composites were prepared by vacuum drying with PDMS. The properties of the materials were characterized by field emission scanning electron microscope, dynamic mechanical analysis, thermogravimetric analysis and high temperature vibration test. The results show that the layered structure of graphene oxide foam not only provides a group of channels for the full penetration of PDMS, but also facilitates the dissipation of vibration energy. Thanks to the layered structure of graphene oxide, the loss modulus of GO/PDMS composites at high temperature (150 ~ 250 ℃) can reach 0.45MPa, which is about 203% higher than that of pure PDMS. When the temperature reaches 250 ℃, GO/PDMS composites have no obvious weight loss. This study provides an ideal candidate material for passive vibration isolation device under high temperature conditions.