Results 211 to 220 of about 13,096 (247)
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Electronic structure of poly(ether—ether—ketone), PEEK
Chemical Physics Letters, 1990Abstract The electronic structure of poly(ether—ether—ketone) (PEEK) is investigated by combining X-ray and ultraviolet photoelectron spectroscopy data with the results of theoretical calculations. XPS core level spectra are related to the charge distribution on the chain, and shake-up satellites are analyzed in terms of electron interaction between ...
R. Lazzaroni +6 more
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A new solvent for poly(ether ether ketone)
Polymer, 1992Abstract A new solvent, 4-chlorophenol, has been used to dissolve poly(ether ether ketone), PEEK, over an extended concentration range. Some properties of the solution were measured and possible effects of the solvent on PEEK were investigated.
Jiarui Xu +3 more
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Terahertz absorption spectroscopy of poly(ether ether ketone)
2017 International Symposium on Electrical Insulating Materials (ISEIM), 2017The crystallinity of sheets of poly(ether ether ketone) (PEEK) was changed by thermal treatments conducted at 295 °C for various periods and their terahertz (THz) and Fourier-transform infrared absorption (FT-IR) spectra were obtained. As a result, it has been confirmed that an absorption peak appears at around 3.5 THz in the sheet samples that exhibit
Takuya Kaneko +2 more
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Sodium sulfonate-functionalized poly(ether ether ketone)s
Macromolecular Chemistry and Physics, 1998A new monomer, sodium 5,5'-carbonylbis(2-fluorobenzenesulfonate) (1), was synthesized by sulfonation of 4,4'-difluorobenzophenone (2) with fuming sulfuric acid. Poly(ether ether ketone)s containing sodium sulfonate groups were synthesized directly via aromatic nucleophilic substitution from the sodium sulfonate-functionalized monomer 1 and Bisphenol A (
Feng Wang, Tianlu Chen, Jiping Xu
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Environmental stress deformation of poly(ether ether ketone)
Journal of Applied Polymer Science, 1997The sorption of water in poly(ether ether ketone) (PEEK) from aqueous solutions containing a small (5 × 10−5 mol fraction) of three different surfactants was investigated as a function of external tensile stress. One of the surfactants, a polyoxyethylene alcohol, exhibited a strong stress effect, producing an increase in water solubility of nearly an ...
Ambrish P. Srivastava +2 more
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Carbon-nanofibre-reinforced poly(ether ether ketone) fibres
Journal of Materials Science, 2003Nano-reinforced fibres were spun from a semicrystalline high-performance poly(ether ether ketone) containing up to 10 wt% vapour-grown carbon nanofibres using conventional polymer processing equipment. Mechanical tensile testing revealed increases in nanocomposite stiffness, yield stress, and fracture strength for both as-spun and heat-treated fibres ...
J. Sandler +5 more
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Scratch hardness studies of poly(ether ether ketone)
Polymer, 1996This paper describes a study of the surface properties of poly(ether ether ketone) (PEEK) using a scratch hardness technique. A comparison of the scratch friction and the hardness values determined for amorphous and semi-crystalline PEEK shows that the crystalline polymer is harder. Studies carried out on PEEK treated with chloroform indicate that this
B.H. Stuart, B.J. Briscoe
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Double-melting behavior of poly(ether ether ketone)
Macromolecules, 1987Abstract : The melting behavior of semicrystalline poly(ether-ether-ketone) (PEEK) has been studied using differential scanning calorimetry (DSC). When cold-crystallized from the amorphous glassy state at high supercooling or when melt-crystallized at low supercooling, PEEK usually shows two melting peaks.
Youngchul Lee, Roger S. Porter
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Thermal expansion of poly(ether‐ether‐ketone) (PEEK)
Journal of Polymer Science Part B: Polymer Physics, 1990AbstractThermal expansivities along the a, b, and c axes of the orthorhombic unit cell of poly (ether‐ether‐ketone (PEEK) crystals have been determined from 160 to 470 K by wide‐angle x‐ray diffraction. The expansivities along the a and b axes are positive while the expansivity along the c (chain) direction is negative, with values of \[ \alpha _a^c =
C. L. Choy, W. P. Leung, C. Nakafuku
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Tribological studies of poly(ether ether ketone) blends
Tribology International, 1998A review of friction and wear studies of poly(ether ether ketone) (PEEK) blended with other polymers is presented. PEEK is a high performance thermoplastic now commonly employed in many engineering applications, but its tribological properties deteriorate in high temperature environments.
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