Abstract
Thermally modified polyimide films based on 1,4-Phenylene diamine (p-PDA) and 3,3,4,4 - Benzophenone tetracarboxylic dianhydride (BTDA) were prepared and their chemical structure transformation after thermal treatment at 350 degrees C-500 degrees C was investigated. X-ray diffraction results revealed an increase in the polymer chain order for all treated PI samples as a consequence of the thermal treatment and chain interaction. TGA analysis showed that the heat treatment promoted different thermal degradation profiles. Electron spin resonance evidenced a large population of free radicals as a result of homogeneous bond cleavage when the thermal treatment was performed at 500 degrees C. X-ray photoelectron spectroscopy analysis indicated that the chemical structure transformation not only occurs on the outer surface but also in the sub-surface layer. These results show that controlled fast thermal treatment can produce materials with specific characteristics and may serve as a general strategy for changing both structural and chemical properties of the polymers. POLYM. ENG. SCI., 58:943-951, 2018. (c) 2017 Society of Plastics Engineers
| Original language | English |
|---|---|
| Pages (from-to) | 943-951 |
| Number of pages | 9 |
| Journal | Polymer Engineering and Science |
| Volume | 58 |
| Issue number | 6 |
| Early online date | 28-Jun-2017 |
| DOIs | |
| Publication status | Published - Jun-2018 |
Keywords
- GAS SEPARATION PROPERTIES
- SULFONATED POLYIMIDE
- PERMEATION PROPERTIES
- CARBON MEMBRANES
- YAG LASER
- XPS
- POLYMERS
- PERVAPORATION
- CARBONIZATION
- DIANHYDRIDES