Table 1. Heat treatment conditions of PI films.
| Sample | Temperature (°C)/time (h)/pressure (torr) |
|---|---|
| PAA | 50/2/1 → 80/1/1 |
| CPI | 110/0.5/1 → 140/0.5/1 → 170/2/1 → 195/2/1 → 220/2/1 → 235/4/1 |
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