Soluble, thermally stable phosphorus containing polyimides have been synthesized to
controlled molecular weights and well-defined phthalimide endgroups via solution
imidization. They were characterized by intrinsic viscosity, DSC, TGA, and
thermomechanical measurements. Molecular weight control was successful and these
polyimides were thermally stable via dynamic TGA up to 500°C. Flame resistance was
suggested by the 10-20 % of char yield observed in air at 750°C. Good tensile modulus
(500-550 ksi) via stress-strain measurements and excellent adhesion to Ti-6AI-4V
substrates through single lap shear tests was demonstrated.
Investigations of the effects of molecular weight and end group on thermal and
mechanical properties of reactive amine terminated and non-reactive phthalic anhydride
terminated PMDA-mBAPPO polyimides were pursued. Polyimides with non-reactive end
groups do not crosslink and, hence, were essential for controlled processability.
Rheological behavior was investigated with a parallel plate type viscometer and the results
confirmed the thermoplastic nature of these systems.
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