Characterization and adhesive bonding of poly(etheretherketone) resins and composites
Conference
·
OSTI ID:6466495
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
- Country of Publication:
- United States
- Language:
- English
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