Order structure and crystals of fully aromatic polyimides grown from solutions
Conference
·
OSTI ID:141730
- Univ. of Akron, OH (United States)
Ordered structure and crystals can be developed in segmented rigid-rod polyimides. For a series of polymers synthesized from 3,3`,4,4`-biphenyltetracarboxylic dianhydride (BPDA) pyromellitic dianhydride (PMDA) and 2,2`-bis(trifluoromethyl)-4,4`-diaminobiphenyl (PFMB), solution crystallization provides lamellar crystals. Electron diffraction experiments indicate that the chain`s direction is perpendicular to the substrate surface. Based on different concentrations and crystallization conditions, the crystal morphology can change from single crystals to dendritic and spherulitic textures. Electron diffraction`s fiber pattern of the polymers provide the same crystal unit cell structure compared to wide-angle x-ray fiber patterns.
- OSTI ID:
- 141730
- Report Number(s):
- CONF-930304--
- Country of Publication:
- United States
- Language:
- English
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