Results 161 to 170 of about 6,593 (202)
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Journal of Mathematical Modeling and Fractional Calculus
Organic chemistry constantly pushes the boundaries by synthesizing new molecules each year. However, before these compounds can be practically used, rigorous testing is needed to understand their characteristics. This process can be expensive and time-consuming, requiring specialized laboratory equipment, chemicals, and personnel.
Umar Farooq, Faryal Chaudhry
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Organic chemistry constantly pushes the boundaries by synthesizing new molecules each year. However, before these compounds can be practically used, rigorous testing is needed to understand their characteristics. This process can be expensive and time-consuming, requiring specialized laboratory equipment, chemicals, and personnel.
Umar Farooq, Faryal Chaudhry
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Synthesis and properties of poly(ether ether ketone ketone)‐poly(ether sulfone) block copolymers
Journal of Applied Polymer Science, 1996Poly(ether ether ketone ketone)-poly(ether sulfone) (PEEKK/PES) block copolymers were prepared from the corresponding oligomers via a nucleophilic aromatic substitution reaction, and the M n of the PEEKK segment was fixed at 12,000, while the M n 's of the PES segment ranged from 250 to 12,680.
Junkui Cao +3 more
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The Semicrystalline Morphology of Poly(ether−ether−ketone) Blends with Poly(ether−imide)
Macromolecules, 1998The microstructure of cold-crystallized poly(ether- ether-ketone)/poly(ether-imide) (PEEK/ PEI) blends has been investigated by a combination of wide- and small- angle X-ray scattering (SAXS), dielectric spectroscopy, and transmission electron microscopy.
Jonas, Alain +2 more
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The crystallinity of poly(ether ether ketone)
Polymer, 1992Abstract Differences have been observed between the enthalpies of crystallization and fusion of quenched ‘amorphous’ poly(ether ether ketone) (PEEK) which have been attributed to residual crystallinity produced during quenching. Comparison with samples of PEEK crystallized under well defined conditions reveals that these apparent differences arise ...
A.A. Mehmet-Alkan, J.N. Hay
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AIP Conference Proceedings, 2020
Polyether ether ketone (PEEK) is one of the most important aromatic polymers; it has many applications in nanotechnology. The new sulfonated polyether ether ketone (sPEEK) membrane was successfully prepared, by using sulfonation processed for PEEK polymer; 10 grams of PEEK sample were dissolved progressively in 200 ml of sulfuric acid (H2SO4).
Salah M. S. Al-Mufti +2 more
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Polyether ether ketone (PEEK) is one of the most important aromatic polymers; it has many applications in nanotechnology. The new sulfonated polyether ether ketone (sPEEK) membrane was successfully prepared, by using sulfonation processed for PEEK polymer; 10 grams of PEEK sample were dissolved progressively in 200 ml of sulfuric acid (H2SO4).
Salah M. S. Al-Mufti +2 more
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Effect of dihydroxydiphenyl ether on poly(ether ether ketone)
Journal of Polymer Research, 1996A series of modified poly(ether ether ketone) (PEEK) polymers were synthesized by introduction of addition ether groups from dihydroxydiphenyl ether (DHDE) into the PEEK structure. The inherent viscosity of the DHDE-modified PEEK increased with reaction time at 320 °C.
K. H. Hsieh +5 more
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Conformational Characteristics of Poly-ether-ether-ketone and Poly-ether-nitrile
Japanese Journal of Applied Physics, 1995Conformational analyses of poly-ether-ether-ketone (PEEK), poly-ether-nitrile (PEN) and their related polymers were performed using a semi-empirical molecular orbital method with the Austin Model 1 Hamiltonian (AM1 method in MOPAC). The minimum energy conformations were in good agreement with those in crystal structures of PEEK and PEN.
Shigenori Shirouzu +2 more
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2009
Abstract Major Applications General-purpose molding and extrusion polymer for high-performance applications, especially as resin for carbon fiber composites. Examples include chemical resistant tubing and electrical insulation, automotive bearings, pump and valve construction for corrosive applications, and compressor valve plates ...
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Abstract Major Applications General-purpose molding and extrusion polymer for high-performance applications, especially as resin for carbon fiber composites. Examples include chemical resistant tubing and electrical insulation, automotive bearings, pump and valve construction for corrosive applications, and compressor valve plates ...
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Rheological properties of phenophthalein poly(ether ether ketone)
Polymer Engineering & Science, 1996AbstractThe rheological properties of the novel engineering thermoplastic phenophthalein poly(ether ether ketone) (PEK‐C) have been investigated using both a rotational and a capillary rheometer. The dependence of the viscosity on the shear rate and temperature was obtained.
NOBILE, Maria Rossella +3 more
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Macromolecular Research, 2010
An improvement in the processability of poly(ether ether ketone) (PEEK) and PEEK/carbon fiber (PEEK/CF) composites with less influence on the other properties is important. A novel high temperature lubricant, GENIOPLAST PELLETS (GPPS), was used to decrease the melt viscosity of PEEK and PEEK/CF composites.
Shuling Zhang +6 more
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An improvement in the processability of poly(ether ether ketone) (PEEK) and PEEK/carbon fiber (PEEK/CF) composites with less influence on the other properties is important. A novel high temperature lubricant, GENIOPLAST PELLETS (GPPS), was used to decrease the melt viscosity of PEEK and PEEK/CF composites.
Shuling Zhang +6 more
openaire +1 more source