NASA NTRS · 19880025984
Polyimide processing additives
Abstract
A method has been found for enhancing the melt flow of thermoplastic polyimides during processing. A high molecular weight 422 copoly(amic acid) or copolyimide was fused with approximately 0.05 to 5 pct by weight of a low molecular weight amic acid or imide additive, and this melt was studied by capillary rheometry. Excellent flow and improved composite properties on graphite resulted from the addition of a PMDA-aniline additive to LARC-TPI. Solution viscosity studies imply that amic acid additives temporarily lower molecular weight and, hence, enlarge the processing window. Thus, compositions containing the additive have a lower melt viscosity for a longer time than those unmodified.
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Pratt, J. R., St. Clair, T. L., Burks, H. D., Stoakley, D. M.. 1987-01-01. Polyimide processing additives. https://ntrs.nasa.gov/citations/19880025984
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