Electrical glass reliability

Relatively few processible polyimides, particularly at a reasonable cost and in reliable supply, are available commercially. Users of polyimides may have to produce intractable polyimides by themselves in situ according to methods discussed earlier, or synthesize polyimides of unique compositions in order to meet property requirements such as thermal and therm oxidative stabilities, mechanical and electrical properties, physical properties such as glass-transition temperature, crystalline melting temperature, density, solubility, optical properties, etc. It is, therefore, essential to thoroughly understand the structure—property relationships of polyimide systems, and excellent review articles are available (1—5,92). 

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