| 摘要 |
<p>The invention relates to a PMR type resin which comprises a mixture of: a) nadic acid of formula (Ia) or a derivative thereof; b) a diaminobisimide of formula (Ib); and c) an aromatic tetracarboxylic acid of formula (Ic) or a derivative thereof, the components (a), (b) and (c) being present in the approximate molar proportions of 2:n:n-1 respectively; and wherein n is chosen to provide a polyimide polymer of the desired size; Ar and Ar' may be the same of different and each represent an optionally substituted aryl, optionnaly substituted bridged or bonded di- or poly- aryl, or optionally substituted heteroaryl group; Ar' is an optionally substituted aryl or heteroaryl group which provides for good conjugation between the nitrogen containing groups; and X is an alkyl group or hydrogen and high temperature resistant matrix polymers for composites made therefrom.</p> |
