Abstract
A poly(amic acid) (PAA) was prepared by reaction of 4,4'- (hexafluoroisopropylidene)diphthalic anhydride (6FDA) and 2,2-bis[4-(4- aminophenoxy)phenyl]hexafluropropane (BAPP) in N,N-dimethylacetamide (DMAc). The cast films of the synthesized PAA were thermally treated at different temperatures to create polyimide (PI) films. The heat treatment temperature varied between 80 and 230°C to investigate the imidization index in relation with the solvent evaporation rates. The progress of PAA imidization was examined using a thermogravimetric analyzer (TGA) and a Fourier transform infrared spectroscope (FTIR) at various time and temperature. The experimental results showed that the imidization index was fast at the initial stage in the presence of solvent, DMAc, reaching the final imidization. When the imidization temperature is high over 200°C, the imidization index decreased because the solvent was evaporated too fast.
| Original language | English |
|---|---|
| Pages (from-to) | 448-454 |
| Number of pages | 7 |
| Journal | Polymer (Korea) |
| Volume | 36 |
| Issue number | 4 |
| DOIs | |
| State | Published - Jul 2012 |
Keywords
- Imidization index
- Polyimide
- Solvent evaporation
- Thermal imidization
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