Publications

Title The Effect of Sizings on the Durability of High Temperature Polymer Composites
Source Proc. 14th Intl. Conf. on Composite Materials, paper 1818
Year 2003
Author(s) Allred, R. E.; Shin, E. E.; Ingrham, L.; Papadopoulos, D.; McCorkle, L.; Wheeler, D. R.; Sutter, J. K.
Abstract To increase performance and durability of high-temperature composites for potential rocket engine components, it is necessary to optimize wetting and interfacial bonding between high modulus carbon fibers and high-temperature polyimide resins. Sizings commercially supplied on most carbon fibers are not compatible with polyimides. In this study, the chemistry of sizings on two high modulus carbon fibers (M40J and M60J, Toray) was characterized. A continuous desizing system that uses an environmentally friendly chemical-mechanical process was developed for tow level fiber. Composites were fabricated with fibers containing the manufacturer’s sizing, desized, and further treated with a reactive finish. Results of room-temperature tests after thermal aging show that the reactive finish produces a higher strength and more durable interface compared to the manufacturer’s sizing. When exposed to moisture blistering tests, however, the better bonded composite displayed a tendency to delaminate, presumably due to trapping of volatiles.
Keywords sizings, reactive finish, thermal aging, mechanical properties, blistering, high temperature, composites, interfacial, bonding, desizing, delaminate

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