Behavior of polyimides based on bicyclo[2.2.2]oct-7-ene-2,3,5,6-tetracarboxylic dianhydride under thermal treatment
This study investigated the preparation and thermal behavior of the polyimide based on the nonaromatic bicyclo[2.2.2]oct‑7-ene-2,3,5,6-tetracarboxylic dianhydride and aromatic 4,4´-(1,4-phenylenediisopropylidene)bisaniline. A significantly greater mass loss was detected in the nitrogen atmosphere th...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-06-01
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| Series: | Chemical Thermodynamics and Thermal Analysis |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2667312625000203 |
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| Summary: | This study investigated the preparation and thermal behavior of the polyimide based on the nonaromatic bicyclo[2.2.2]oct‑7-ene-2,3,5,6-tetracarboxylic dianhydride and aromatic 4,4´-(1,4-phenylenediisopropylidene)bisaniline. A significantly greater mass loss was detected in the nitrogen atmosphere than in the air atmosphere by using an isothermal thermogravimetric analysis of this product at 375 °C. This loss in nitrogen was reduced when approximately 1 wt% of the radical inhibitor 2,6-di‑tert-4-methylphenol was added to the polymer, whereas in the case of using an atmosphere containing oxygen, which is one from the most effective radical inhibitors, the presence of 2,6-di‑tert-4-methylphenol had practically no effect. This finding supports the application of a retro Diels–Alder reaction during the decomposition of the structure coming from bicyclo[2.2.2]oct‑7-ene-2,3,5,6-tetracarboxylic dianhydride including radical formation as intermediate products at temperatures above 350 °C, whereby the present oxygen inhibits this process very effectively. The products formed during thermal attack were analyzed via a combination of dynamic thermogravimetry with infrared spectroscopy. Some aspects of fully aromatic polyimides based on 4,4´-oxydiphthalic anhydride and 4,4´-(1,4-phenyleneisopropylidene)bisaniline were compared. |
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| ISSN: | 2667-3126 |