Characterization of polyetheretherketone and other engineering thermoplastics
Three engineering thermoplastic materials were characterized by thermal/spectroscopic means to assess their suitability in fiberglass-filled molding resins for Mound applications. The three resins examined were: polyetheretherketone (PEEK) from ICI, Ltd., polyetherimide (PEI) from General Electric, and polyethersulfone (PES) from ICI. Thermogravimetric analysis of the three thermoplastics in N/sub 2/ showed that all had a decomposition onset temperature greater than or equal to 525/sup 0/C with PEEK > PEI > PES. Melt thermal stability analyses of glass-filled PEEK and of PEI showed <1% weight loss after 2 hr (N/sub 2/). Thermomechanical analysis (TMA) of glass-filled PEEK revealed a low temperature (approx. 60/sup -/70/sup 0/C) transition below T/sub g/ (approx. 150/sup 0/C). This transition disappeared on subsequent TMA runs and did not reappear on aging at room temperature, which suggests it was the result of molding stresses. Extra transitions below T/sub g/ were also noted for PES and PEI. Direct probe/mass spectroscopy reconstructed ion chromatograms showed water and phenyl sulfone ions to be present in both PES and PEEK (and volatilized below 200/sup 0/C in vacuum). Water only was observed in PEI. The presence of phenyl sulfone in PEEK was confirmed by FT-IR, and sulfur was found in amounts up to 0.23% by weight in 30% glass-filled molding compounds. A polymerization solvent, such as diphenyl sulfone, is a probable source. Fluoride (from a monomer used in the PEEK polymerization) was also detected in amounts up to 0.17% by weight in the 30% fiberglass molding compounds.
- Research Organization:
- Monsanto Research Corp., Miamisburg, OH (USA). Mound
- DOE Contract Number:
- AC04-76DP00053
- OSTI ID:
- 6858385
- Report Number(s):
- MLM-3141; ON: DE84010668
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360404* -- Materials-- Polymers & Plastics-- Physical Properties-- (-1987)
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
DECOMPOSITION
GRAVIMETRIC ANALYSIS
HYDROGEN COMPOUNDS
IMPURITIES
MATERIALS
MOLDING MATERIALS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
ORGANIC SULFUR COMPOUNDS
OXYGEN COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYMERS
QUANTITATIVE CHEMICAL ANALYSIS
RESINS
STABILITY
SULFONES
SYNTHETIC MATERIALS
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
THERMOPLASTICS
WATER