科研之友
微信
新浪微博
Facebook
分享链接
摘要
In automotive under-the-hood applications, electronics respectively their packaging materials come in contact with automotive fluids. The effect of automatic transmission fluid (ATF) on an anhydride-cured epoxy was investigated at temperatures up to 180 degrees C for up to 1000 h. This study has shown that ATF retards the oxidative aging of the epoxy, presumably due to oxygen consumption. Whereas in air the material underwent a thermo-oxidative aging with a mass loss of up to 4% and a strong broadening of T-g to higher temperatures, in ATF a temperature dependent distinctive drop of T-g from 142 to 126 degrees C after 1000 h aging at 180 degrees C, and a mass loss of maximum 1% was observed which might be a thermal decomposition of the epoxy material. A slight broadening of the damping factors might indicate an intrusion of ATF components. A color change of the samples could be observed after aging in air and ATF, with the discoloration in air being more intense. An explanation for the color change might be either a minor amount of oxygen causing an oxidative discoloration reaction or the intrusion of colored ATF degradation products. While the oxidation-kinetics in air exhibited Arrhenius temperature-dependence the mechanism in ATF changed above 165 degrees C. An acceleration of aging tests at temperatures beyond 150 degrees C is, therefore, not possible.
- 出版日期2017-7-15
