Ethynyl-Terminated Imide Oligomers

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Abstract
Linear polyimides are prepared by condensation polynerization which involves the elimination of volatiles. These volatiles are responsible for severe problems encountered in the fabrication of parts, particularly thick and large components. Some success has been attained by reducing the volatile level through p-staging, which is generally accompanied by reduced resin flow and also by using an intricate bleeder system and a long cure cycle. A few high-temperature polyimides can be processed as thermoplastics. However, high temperature and pressure are generally required for their processing. An alternative approach for circumventing these problems is the development of imide oligomers which can be thermally chain extended through an addition-type polymerization. Considerable effort has been devoted during the last few decades to develop thermally stable polyimides which cure without the evolution of volatile by-products.