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Showing 1 to 20 of 29 for “"poly(ether ether ketone)"”.
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Solvent-Induced Crystallization of Poly(ether ether ketone)
… during solvent-induced crystallization of poly(ether ether ketone) (PEEK). Unoriented amorphous PEEK films were immersed in aprotic organic liquids at ambient temperature and bulk properties or characteristics were monitored as a function of immersion time. The sorption behavior, Tg and Tm° …
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Effect of intermediate solvents on poly(ether ether ketone)
The interaction between poly(ether ether ketone) (PEEK) and three solvents (i.e., methylene chloride, tetrahydrofuran, and acetone) was studied by means of several complementary techniques. A series of eleven 0.3 mm thick PEEK films was produced. Each film had a certain crystallinity index and …
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Morphology-Property Relationships in Semicrystalline Aerogels of Poly(ether ether ketone)
… diagrams for the thermoreversible gelation of poly(ether ether ketone) (PEEK) in dichloroacetic acid (DCA) and 4-chlorophenol (4CP) were constructed over broad temperature and concentration ranges, revealing that PEEK is capable of dissolving and forming gels in DCA and 4CP up to a weight …
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Biomimetic Design of Poly(ether ether ketone) Composites for Bone Replacement
… nickel-cobalt alloys, titanium, and high-density polyethylene. These replacements have a lifespan of 10-20 years with a 10% risk of rejection from the body. Rejection can be caused by metal leeching into the bloodstream, growth of bacteria on the surface of the material, and the weakening of bone …
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Cross linked sulphonated poly (ether ether ketone) for the development of polymer electrolyte membrane fuel cell
Ion irradiation has been investigated as a route for the preparation of mechanically stable and highly durable cross linked sulphonated PEEK for fuel cell application. The formation of cross linking was confirmed by solvent extraction using the well known Charlsby–Pinner equation. The DSC results …
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Preparation of highly reflective films by supercritical infusion of a silver additive into poly(ether ether ketone)
There has been a great interest in preparing polymeric reflective surfaces in the last few years. The application of supercritical fluid technology in this area is beginning to receive a great deal of attention. Poly ether ether ketone (PEEK) is well known for its excellent thermal, chemical, …
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An Investigation of the Microstructure and Properties of a Cryogenically Mechanically Alloyed Polycarbonate-Poly(Ether Ether Ketone) System
… of a model cryogenically mechanically alloyed polymer-polymer system: polycarbonate (PC) and poly (ether ether ketone) (PEEK). Mechanically milled and alloyed powders were characterized using a variety of techniques including microscopy and thermal analysis. Cryogenically mechanically alloyed …
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Fundamental aspects of the tribological behavior of poly(ether-ether-ketone)-based in-situ composites at elevated temperatures
… and thermotropic liquid crystalline polymers (TLCPs) are recently developed, innovative polymeric materials, which have been reported to exhibit outstanding property profiles. These profiles include superior mechanical properties, excellent thermal and dimensional stabilities at high …
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Process-morphology-property Relationships in Strut-like Poly(ether ether ketone) Aerogels Prepared through Thermally Induced Phase Separation
Poly(ether ether ketone) (PEEK) aerogels resulting from gelation in 1,3-diphenyl acetone (DPA) were prepared for the first time. The phase separation mechanism was determined to be solid-liquid phase separation which resulted in the formation of aerogels consisting of crystalline axialites. These …
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Design of Advanced Materials With Novel Microstructural Features
… were prepared by solution blending sulfonated poly (ether ether ketone) and polyacrylonitrile in DMF and heating under nitrogen at 380 °C. This novel system offered a possible low-cost alternative to Nafion membranes for fuel cells.
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Macrocyclic Monomers: Synthesis, Characterization and Ring-opening Polymerization
… of high yield synthesis and facile ring-opening polymerization of cyclic polycarbonate; the need for a technique to solve the tough processibility problem of high performance polymers. This work was intended to address the following aspects in the cyclic poly(ether ketone) or sulfone system. The …
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The synthesis, stabilization and sintering of high performance semicrystalline polymeric powders
… new method for forming graphite reinforced, polymer matrix composites, was investigated. This methodology could circumvent many of the environmental and processing problems prominent in the current state of the art. Aqueous dispersion prepregging requires that the matrix resin be in the form …
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Preparation and Characterization of Magnetic Nanocomposite in a Polymer Matrix By Ion Implantation
… is to induce ferromagnetic metals into a polymer matrix and perform magnetic and electrical characterization on the material. The addition of the ferromagnetic metals should enhance the magneto resistance of the material and also produce semiconductor behavior. The samples consist of a …
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Friction and lubrication behaviour of hip resurfacing metal-on-metal and ZTA ceramic on CFR peek implants with various diameters and clearances. Friction and lubrication behaviour of hip resurfacing Co-Cr-Mo and zirconia toughened alumina ceramic heads against carbon fibre reinforced poly-ether-ether-ketone cups with various diameters and clearances have been investigated using serum-based lubricants.
… CoCrMo heads versus ultra high molecular weight polyethylene (UHMWPE) cups have a limited lifetime, mainly due to the wear of the UHMWPE cups as a result of high friction between the articulating surfaces leading to osteolysis and implant loosening with revision surgery becoming inevitable in …
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Tribological behavior of unfilled and carbon fiber reinforced polyether ether ketone/polyether imide composites
The friction and wear of injection molded Poly(ether ether ketone) (PEEK) and Poly(ether imide) (PEI), PEEK/PEI blends with the weight compositions of 50/50 %, 70/30 %, and 85/15 %, with and without short carbon fibers were measured in a pin(52100 steel ball)-on-disk(polymer blend) configuration …
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The preparation of high performance polymers for composites and blends: A) thermally stable ion containing polymers B) epoxy and hydroxy functional polyolefin macromers
… or soluble high performance ion containing polymers to be used as composite system interfacial modifiers and processing aids. In the first approach, thermally stable pyridine containing poly(ary/ene ether)s were designed which could be ionized by protonation in acidic aqueous media. A novel …
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Enhancing materials for fuel cells and organic solar cells through molecular design
… cells and solar cells. In chapter 1, triptycene poly(aryl ethers) are synthesized and characterized for enhancing ion conductivity of ion exchange membranes in fuel cells. Triptycene motif is incorporated to increase charge density and fractional free volume in the membranes. In Chapter 1.2, …
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Chemical and Physical Modifications of Semicrystalline Gels to Achieve Controlled Heterogeneity
Sulfonated polyaromatic hydrocarbon membranes have emerged as desirable candidates for proton exchange membranes (PEMs) due to their excellent mechanical properties, high thermal and chemical stability, and low cost. Specifically, sulfonated multiblock copolymers are attractive because their …
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Synthetic Design of Multiphase Systems for Advanced Polymeric Materials
… In this work, we detail the halogenation of poly(ether ether ketone) (PEEK) through both solution-state and gel-state functionalization methods. The multiphase gel-state chemistry restricts functionalization to the amorphous regions of the semi-crystalline parent homopolymer and generates a …
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Part I: Synthesis and Ring Opening Polymerization of Macrocyclic Monomers for Production of Engineering Thermoplastics
Part I: Single sized, pure arylene ether macrocycles ranging from 30 to 60 atom ring sizes were synthesized in good yields (up to 83%) by the two component method under high dilution conditions. These macrocycles have unsymmetric structures containing sulfone/ketone or sulfone/phosphine oxide …
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