Adhesion between thermoplastic polymer particles and carbon and glass fibers
- Georgia Inst. of Technology, Atlanta, GA (United States)
High performance composites consist of polymer matrices reinforced with continuous fibers. Polymer powders can be coated and fused onto the fibers by various techniques to produce these composites. One such technique consists of spreading the fibers with an air banding jet, and then running the fibers through a fluidized bed of the powder. The fluidizing air is typically charged, imparting a charge to the powder particles. The fibers are grounded which leads to an attraction between the particles and the fibers. The particle-coated fibers then go through a tunnel oven, sintering the particles onto the fibers, leaving a flexible {open_quotes}tow-preg{close_quotes} which can then be processed into a preform for manufacture into a final part. To develop an initial understanding of the powder coating process, the adhesion of uncharged particles and fibers was studied. Contact mechanics predicts that the adhesion force between uncharged particles depends on the mutual (or equivalent) radius of curvature between the contacting objects, as well as their surface energies. For the materials of interest, the Derjaguin approximation is appropriate and is applied. PEEK (poly ether ether ketone) and PET (poly ethylene terephthalate) particles, cryogenically ground to nominal diameters of 10 to 100 {mu}m were brought into contact with themselves, with E-glass fibers (nominal diameter of 20 {mu}m), carbon fibers (nominal diameter of 8 {mu}m), and glass microscope slides using an AFM. Adhesion forces were measured and compared to predictions using Derjaguin`s approximation. SEM micrographs were used to determine the scale of the radii of curvature of contacting sites.
- OSTI ID:
- 441515
- Report Number(s):
- CONF-960214-; TRN: 96:006556-0048
- Resource Relation:
- Conference: 19. annual meeting of the Adhesion Society, Inc, Myrtle Beach, SC (United States), 18-21 Feb 1996; Other Information: PBD: 1996; Related Information: Is Part Of Proceedings of the 19th annual meeting of the Adhesion Society; Ward, T.C. [ed.]; PB: 567 p.
- Country of Publication:
- United States
- Language:
- English
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