热真空环境对常用胶接材料性能的影响

空间的热真空环境是造成光电子器件胶接材料性能退化和放气污染的重要因素.为此,考察了几类典型胶接材料的热真空老化和热真空挥发特性,分析了热真空老化后的力学性能变化及真空挥发产物的主要来源,并对热真空挥发预处理方法进行了验证.结果表明软质的硅橡胶与硬质的环氧树脂胶和丙烯酸树脂胶相比有着更大的质量损失,且含有端羟基的缩聚型硅橡胶和环氧树脂胶真空老化后的模量变化较大.通过真空预处理可以作为降低固化胶真空挥发产物来源的一种有效手段.可为宇航用光电子器件胶接材料的设计选型提供参考依据.

Effect of Thermal Vacuum Environment on Performance ofAdhesive Bonding Materials

The thermal vacuum of space condition is an important factor to cause properties degradation and outgassing
contamination of adhesive bonding materials used in optic-electrical components. The thermal vacuum aging
and volatile characteristic of several typical adhesive bonding materials were investigated. The change of mechanical
properties and the source of volatile after thermal vacuum test were analyzed and discussed, and the pretreatment
method under thermal vacuum condition were validated and analyzed. The results indicate that the soft silicone rubber
adhesive display greater mass loss than that of harder epoxy resin and acrylic resin adhesives, and the condensation
type silicone rubber and epoxy resin adhesives appear greater changes of modulus because of end hydroxyl group exist
in their molecular structures. The pretreatment method under thermal vacuum condition could be used as an effective
measure to reduce the outgassing contamination of adhesive bonding materials. The results are important for the design
and screening of nonmetallic materials used in optic-electrical components.