Crystal and molecular structure of the thioether-analogue of PEEK from X-ray powder data and diffraction-modelling

Colquhoun, Howard M.; Aldred, Peter; Hay, Allan S.; Hlil, Antisar R.; Miyatake, Kenji; Williams, David J.

doi:10.1016/j.polymer.2005.11.068

Cited by 5 publications

(3 citation statements)

References 27 publications

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Section: Resultsmentioning

confidence: 99%

“…PEEK is known to crystallize in the orthorhombic space group Pbcn with two chains per unit. 13,49 Four strong diffraction peaks belonging to PEEK were identified at 2 theta angles of 19.02 • , 21.04 • , 23.12 • and 29.13 • . In contrast to the XRD pattern of PEEK powder, an additional four weak diffraction peaks of PEEK were identified at 2 theta angles of 33.13 • , 39.48 • , 41.13 • and 48.00 • .…”

Section: Microstructure and Surface Topography Of Al 2 O 3 /Peekmentioning

confidence: 99%

“…The presence of these weak peaks is in line with previous studies. 13,49 The crystallinity of PEEK depending upon its thermal processing history. 13 According to the literature, 45,48 crystallinity in PEEK was found to range from about 0% (for samples quenched in cold water) to 45% (for samples crystallized at a temperature of 320 • C).…”

Section: Microstructure and Surface Topography Of Al 2 O 3 /Peekmentioning

confidence: 99%

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Electrophoretic Deposition, Microstructure and Selected Properties of Composite Alumina/Polyetheretherketone Coatings on the Ti-13Nb-13Zr Alloy

Moskalewicz

Zimowski

Zych

et al. 2018

J. Electrochem. Soc.

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In this work, 45-120 μm thick, composite Al 2 O 3 /PEEK coatings were fabricated on the Ti-13Nb-13Zr alloy substrate using electrophoretic deposition. The anodic co-deposition of alumina and PEEK particles were investigated and discussed. The asdeposited coatings exhibited the uniform distribution of a nearly amorphous PEEK and crystalline alumina powders on the titanium alloy substrate. The morphology of PEEK in the coatings was changed by heating above the PEEK melting point from granular into dense coating matrix with semi-crystalline structure and spherulitic morphology. Scanning and transmission electron microscopy investigation of the coating microstructure revealed the presence of uniformly distributed Al 2 O 3 nanoparticles and their agglomerates within the PEEK matrix. Micro-scratch tests indicated that the coatings are characterized by excellent adhesion to the underlying substrate. The Al 2 O 3 /PEEK coatings significantly improved the wear resistance and reduced coefficient of friction of the Ti-13Nb-13Zr alloy during dry sliding, also in comparison with a polymer PEEK coated alloy. However, the wear resistance of the Al 2 O 3 /PEEK coated alloy during sliding in Ringer's solution was less than the PEEK coated alloy. The coatings increased the corrosion resistance of the alloy in Ringer's solution. The coatings were also found to be cytocompatible with Among biometallic materials, titanium alloys are increasingly used in medicine as implant material, due to their favorable mechanical properties, low elastic modulus, good electrochemical corrosion resistance and relatively good biocompatibility.1-4 Generally, β and near-β (including Ti-13Nb-13Zr) alloys have about 30% lower Young's modulus than that of two phase α+β alloys. 5 In the case of Ti-13Nb-13Zr alloy the elasticity modulus is reduced by Nb, 6 while Zr is neutral for both the α and β phase. The uses of all titanium alloys in applications exposed to abrasive wear in orthopedic surgery and traumatology, for example, in the head and acetabulum of hip endoprostheses, are limited. This is because of their relatively low hardness, low resistance to abrasive wear, high and unstable coefficient of friction (COF), severe adhesive wear and tendency to seize. 1,[7][8][9][10][11][12] Therefore, in order to improve the bio-tribological performance of titanium alloys, surface treatment is necessary.In recent years, polyetheretherketone (PEEK) coatings have often been applied as solid lubricant films in bio-tribosystems because of their notable wear resistance, corrosion resistance and self-lubricating capacity.13,14 PEEK, with a basic formula of (-C6H4-O-C6H4-O-C6H4-CO-)n, is a polyaromatic, semi-crystalline thermoplastic polymer exhibiting a superior combination of strength, stiffness, toughness and good biocompatibility. 15 Numerous studies have confirmed the successful clinical performance of PEEK for in vivo medical device applications, in orthopedic and spine implants. 13,[15][16][17][18] A number of studies [19][20][21] have also been conducted to d...

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Section: Resultsmentioning

confidence: 99%

Section: Microstructure and Surface Topography Of Al 2 O 3 /Peekmentioning

confidence: 99%