形状记忆环氧材料漏电流抑制技术及耐辐照性能提升方法

Concerning the issue of leakage current easily arising in shape memory polymer materials used for deployable structures in spacecraft when changes in charge transport properties occur in a space radiation environment, which may lead to degradation, breakdown of structural components, and even disruptions to the normal operation of spacecraft, a method for suppressing irradiation-induced leakage current in shape memory polymers is proposed, focusing on the design of the polymer's three-dimensional network structure. This method aims to enhance the performance of shape memory polymers and offer guidance for the selection and design of materials for space deployable structures. By manipulating the polymer's three-dimensional network structure through the introduction of curing agents with varying functionalities and proportions into commonly used bisphenol A epoxy resin materials, shape memory epoxy materials with different thermodynamic properties are obtained. An online X-ray irradiation-induced conductivity testing system is employed to characterize the evolution of leakage current in different epoxy materials under varying irradiation powers. The findings reveal that compared to a shape memory epoxy material system with a curing agent functionality of 5, the X-ray radiation-induced conductivity of a system with a curing agent functionality of 6 decreases by approximately 50 % along with changes in the curing agent ratio. Essentially, opting for epoxy materials with relatively higher curing agent functionalities can result in the development of a more compact polymer three-dimensional network structure, leading to enhanced thermodynamic stability and X-ray irradiation-induced conductivity performance. This improvement is beneficial for suppressing irradiation-induced leakage current and bolstering the X-ray irradiation protection capabilities of space deployable structures.