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

Leakage Current Suppressing Techniques and X-Ray Irradiation ResistancePerformance Enhancement Methods for Shape Memory Epoxy Materials

针对航天器空间可展开结构用形状记忆聚合物材料在空间辐照环境中电荷输运性能发生变化时易产生漏电流,从而造成结构器件劣化、击穿,甚至影响航天器正常运行的问题,从高分子三维网状结构设计角度出发,提出一种形状记忆聚合物辐照感应漏电流抑制方法,实现了形状记忆聚合物的性能提升,能够指导空间可展开结构材料的选型和设计。基于常用的双酚A环氧树脂材料,通过引入不同官能度和配比的固化剂调控其高分子三维网状结构,获得了具有不同热力学性能的形状记忆环氧材料。采用X射线辐照感应电导率在线测试系统,表征不同体系环氧材料在不同辐照功率下的漏电流演变情况。研究结果表明:相较于固化剂官能度为5的形状记忆环氧材料体系,固化剂官能度为6环氧材料体系的X射线辐照感应电导率随固化剂配比变化的幅度减小了约50%,即选择官能度相对较高的固化剂体系环氧材料,能够构建更加致密的高分子三维网状结构,可获得更加稳定的热力学和X射线辐照感应电导性能,更有利于抑制辐照感应漏电流,从而增强了空间展开结构X射线辐照防护效果。

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.