| Summary: | High-performance polymers have found an extreme range of applications in the
aerospace industry. Composites which have polymers incorporated in them can usually
meet the needs of the design, and are the ideal materials for aerospace applications due
to their light weight, high strength, and radar transparency. Phenyl-ethynyl terminated
oligomers, for example, have found many uses in the aerospace industry. Phenyl-ethynyl
terminated oligomers (AFR-PEPA-N) exhibit glass-transition temperatures of up to
450ðC. Unfortunately crystals form due to interactions of the oligomers. These crystals
do not melt until 360ðC after 15 minutes when the resin is already 50% cured.
Investigation was performed to find any possible alteration to the end-caps and
monomer chain elements of the current AFR-PEPA-N. Several siloxane related amines
were added to the AFR-PEPA-N chain to form protective coatings when in service at
high temperatures. The new poly(siloxane imide) showed an increase in processability
while mantaining AFR-PEPA-N properties. In addition, phenyl-ethnyl end-caps were
substituted with an ethynyl end-caps which showed no improvement in processability.
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