Fundamental Studies on Reactive Oligomers
Final rept. 1 Feb 1973-31 Jan 1974
NOTRE DAME UNIV IN
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A new aromatic diamine, bis4-3-aminophenoxyphenyl sulfone BAPS- 4,3 was prepared by hydrolysis of the precursor, bis4-3-acetamidophenoxy phenyl sulfone, whereas attempts to prepare the nitro-precursor of BAPS-4,3 from the chlorophenyl sulfone and sodium nitrophenoxide were unsuccessful. 4- Aminophthalonitrile was prepared in high purity by the catalytic reduction of 4- nitrophthalonitrile. A number of epoxide-terminated oligomeric aromatic polyimides BTEP series were synthesized by the simple, direct reaction of amine-terminated oligomeric polyimides with epichlorohydrin in the presence of base. A number of cured products showed TGA inflection points in air in the 450- 490 C region. The peroxidation of a styrene-terminated oligomer yielded an epoxide-terminated oligomer BTSO series whose TGA value in air showed a break in the 350-400 C region, and inflection points in the 565-595 C region. A phthalonitrile-terminated oligomer BTPN-1 was prepared using 4- aminophthalonitrile as the telomerizing fraction. A new polyimide, PI-25, based on BAPS-4,3 was prepared and its tractability and thermal behavior were similar to polyimides PI-17 and PI-20 based on 1,3-di4-aminophenoxy benzene DAPB-3,3 .
- Polymer Chemistry
- Atomic and Molecular Physics and Spectroscopy