Characterization and adhesive bonding of poly(etheretherketone) resins and composites
Characterization and adhesive bonding studies of Poly(etheretherketone) (PEEK), produced by ICI, Ltd., have been conducted in relation to its use in wire coatings and in fiberglass-filled molding compounds at Mound. Thermal analyses have shown several PEEK resins to have essentially the same T/sub g/ and T/sub m/ values, indicating the same starting PEEK polymer was used. Differential scanning calorimetry (DSC) annealing studies showed the development of a second melting endotherm (or a shoulder of the first) after annealing above T/sub g/. Both x-ray diffraction and DSC data indicate the degree of crystallinity of melt-processed PEEK or PEEK-fiberglass (FG) (i.e., extruded or molded) to be low (less than or equal to 15%), but an unprocessed PEEK resin powder was approx. 35% crystalline. Chemical and spectroscopic analyses (elemental, Fourier Transform-Infrared (FT-IR), C-13 nuclear magnetic resonance (NMR), x-ray photoelectron spectroscopy (XPS)) support the predominant (i.e., 100% or nearly so) structural repeat unit of PEEK as being (O-phi-O-phi-CO-phi-) (where phi = benzene). Molecular weights of two PEEK resins were determined by light scattering, in 95% H/sub 2/SO/sub 4/, to be 123,000 and 73,000, after correction for anisotropy, due to its rod-like conformation. The critical surface tension of molded PEEK (neat) was determined by contact angle measurements to be approx. 36 to 39 dynes/cm, indicating PEEK to be a moderately low surface energy solid. However, acceptable bondability can be obtained for several adhesives following modification/activation of the PEEK surface, particularly by sanding or oxygen plasma treatment.
- Research Organization:
- Monsanto Research Corp., Miamisburg, OH (USA). Mound; Monsanto Co., St. Louis, MO (USA)
- DOE Contract Number:
- AC04-76DP00053
- OSTI ID:
- 6466495
- Report Number(s):
- MLM-3164(OP); CONF-841055-5; ON: DE85002526
- Resource Relation:
- Conference: 16. national SAMPE technical conference on materials and processes, Albuquerque, NM, USA, 9 Oct 1984; Other Information: Portions are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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