Stock material or miscellaneous articles – Composite
Patent
1993-11-30
1995-10-03
Michl, Paul R.
Stock material or miscellaneous articles
Composite
4284735, 264137, 264241, 264258, 26433119, 156181, 1563311, B32B 3104, B32B 2706, B32B 904, B28B 500
Patent
active
054551153
ABSTRACT:
A preferred class of polyimide oligomers include (1) linear, difunctional crosslinking oligomers prepared by condensing an imidophenylamine end cap with a lower alkylene diamine or a polyaryldiamine such as 3,3'-phenoxyphenylsulfone diamine and with a dianhydride, particularly 4,4'-phenoxyphenylsulfone dianhydride; and (2) multidimensional, crosslinking, polyimide oligomers having an aromatic hub and at least two radiating arms connected to the hub, each arm including a crosslinking imidophenylamine end cap at its distal end and at least two imide linkages.
Blends, prepregs, and composites can be prepared from the oligomers.
Also described is a method for improving the thermal stability of composites prepared from linear and multidimensional polyimide oligomers and blends which includes the steps of (a) impregnating a fabric with a polyimide oligomer or blend to form a prepreg; (b) heating the prepreg at an elevated temperature and under pressure for a time sufficient to cure the prepreg and form a composite; and (c) post-curing the composite at a temperature of approximately 700.degree. F. and for a time sufficient to improve the thermal stability thereof.
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Lubowitz Hyman R.
Sheppard Clyde H.
Hampton-Hightower P.
Michl Paul R.
The Boeing Company
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