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The development of an alternative thermoplastic powder prepregging techniqueAn alternative powder prepregging technique is discussed that is based on the deposition of powder onto carbon fibers that have been moistened using an ultrasonic humidifier. The dry fiber tow is initially spread to allow a greater amount of the fiber surface to be exposed to the powder, thus ensuring a significant amount of intimate contact between the fiber and the matrix. Moisture in the form of ultrafine water droplets is then deposited onto the spread fiber tow. The moisture promotes adhesion to the fiber until the powder can be tacked to the fibers by melting. Powdered resin is then sieved onto the fibers and then tacked onto the fibers by quick heating in a convective oven. This study focuses on the production of prepregs and laminates made with LaRC-TPI (thermoplastic polyimide) using this process. Although the process appears to be successful, early evaluation was hampered by poor interfacial adhesion. The adhesion problem, however, seems to be the result of a material system incompatibility, rather than being influenced by the process.
Document ID
Document Type
Reprint (Version printed in journal)
Ogden, A. L. (NASA Langley Research Center Hampton, VA, United States)
Hyer, M. W. (NASA Langley Research Center Hampton, VA, United States)
Wilkes, G. L. (NASA Langley Research Center Hampton, VA, United States)
Loos, A. C. (Virginia Polytechnic Institute and State University Blacksburg, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1992
Publication Information
Publication: Journal of Thermoplastic Composite Materials
Volume: 5
ISSN: 0892-7057
Subject Category
Funding Number(s)
Distribution Limits