Copolymers of vinyl styrlpyridines or vinyl stilbazoles with bismaleimide
AssigneeThe United States of America as represented by the Administrator of the National Aeronautics and Space Administration
InventorsJohn A. Parker, Alvin H. Heimbuch, Ming-Ta S. Hsu, Timothy S. Chen
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Abstract
Vinyl pyridines including vinyl stilbazole materials and vinyl styrylpyridine oligomer materials are disclosed. These vinylpyridines form copolymers with bismaleimides which copolymers have good fire retardancy and decreased brittleness. The cure temperatures of the copolymers are substantially below the cure temperatures of the bismaleimides alone. Reinforced composites made from the cured copolymers are disclosed as well.
Claims24
A cured copolymeric resin comprising 15 to 1.0 parts by weight of bismaleimide copolymerized with one part by weight of a 5-vinyl-2-stilbazole of the structure ##STR14## wherein R and R.sup.1 are independently selected from the group consisting of hydrogen, lower alkyls, lower alkoxies, phenyl, alkyl phenyls of 7 to 9 carbons, chloro, bromo and iodo.
A cured copolymeric resin comprising 15 to 1.0 parts by weight of bismaleimide copolymerized with one part by weight of a vinyl styrylpyridine oligomer of the structure ##STR15## wherein in the A aromatic rings R.sub.1 is hydrogen or a lower alkyl and the two olefin bonds are attached to the aromatic ring meta or para to one another, and in the B aromatic ring R.sub.2 is a lower alkyl, haloalkyl, or alkoxyl and the two olefin bonds are attached to the B aromatic ring in the 2, 6 or 2, 4 positions, with R.sub.2 in the 4 or 6 position not occupied by an olefin bond.
Dependencies are inferred from the claim text.