| 摘要 |
Solar cells, particularly those positioned in space, require a coating to protect the solar cell against damage caused by solar radiation. The present invention provides such a protective coating which is a polyimide which has the required combination of properties of being colorless, transparent, relatively non-brittle, having a high degree of thermal stability and readily transmitting solar radiation without appreciable degradation. The coating (22) is heat resistant and does not degrade significantly when exposed to ultraviolet radiation, and is highly effective in repelling low energy proton particles. In a preferred embodiment, the protective polyimide coating is a polymer having the recurring structural unit (I). |
