Can centrifugation affect the morphology of polyethylene wear debris?

Zolotarevova, E.; Fejfarkova, Zlata; Entlicher, G.; Lapčíková, Monika; Šlouf, Miroslav; Pokorný, D; Sosna, A

doi:10.1016/j.wear.2008.04.005

Cited by 17 publications

(13 citation statements)

References 12 publications

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“…For the PLA/PCL blends with particulate morphology (compositions from 95/5 to 70/30), we determined particle size distributions, which were based on EquivalentDiameter of the particles (ED = [4A/p] 1/2 , where A is the area of the particle and ED represents the diameter of a circle with the same area as the corresponding object; Ref. [34]). For the whole concentration range, we determined an overall measure structure coarsenessMeanChordLength (CL, which is calculated as the mean length of secants in pseudo-random directions within the micrograph, where the edges of the secants are defined by the interphase boundaries [33]).…”

Section: Scanning Electron Microscopy and Morphology Determinationmentioning

confidence: 99%

Phase structure evolution during mixing and processing of poly(lactic acid)/polycaprolactone (PLA/PCL) blends

et al. 2015

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The morphology of quenched and compression molded samples of poly(lactic acid)/polycaprolactone (PLA/PCL) blend prepared by melt mixing was carefully characterized by the method reflecting eventual nonuniformity of the blend structure and/or broad particle size distribution. Determined number and volume average droplet radii for quenched samples were compared with theory, assuming that flow field in a mixing chamber can be substituted by the shear flow with effective shear rate. An increase in droplet radii during compression molding was compared with theory of the coalescence in quiescent state. Using the concept of effective shear flow to describe mixing leads to a strong disagreement between theory and experiment for the critical droplet radius of its breakup, and for the coalescence efficiency. The theory of coalescence in quiescent state provides fair description of an increase in the number average droplet radius during compression molding, but totally fails at prediction of an increase in the volume average droplet radius.

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Section: Scanning Electron Microscopy and Morphology Determinationmentioning

confidence: 99%

Phase structure evolution during mixing and processing of poly(lactic acid)/polycaprolactone (PLA/PCL) blends

et al. 2015

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“…Firstly, we used a well-established isolation technique, which had already been employed and perfected in our previous studies [12][13][14][15]. Secondly, the purity of the isolated PE particles on PC membranes was investigated by means of FTIR: comparison of IR spectra of pure PE, unused PC membrane and PC membrane with PE nanoparticles showed that all samples exhibited only peaks of PE and/or PC (Fig.…”

Section: Purity Of Isolated Particlesmentioning

confidence: 99%

“…[11][12][13][14][15][16][17][18][19][20]). Particles coming from one of our typical samples of periprosthetic tissue are shown in Fig.…”

Section: Nanoparticles In Other Samplesmentioning

confidence: 99%

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Nanometer size wear debris generated from ultra high molecular weight polyethylene in vivo

Lapčíková

Šlouf

Dybal

et al. 2009

Wear

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“…(b) Other studies concluded that the average size of wear particles was around 0.5 μm,21 which gives about 10 13 wear particles. (c) In our own recent study we found that the average size of wear particles varied around 0.3 μm,23 which corresponded to a number of 10 14 wear particles. (d) Several recent studies have reported wear nanoparticles in vivo , with average size below 0.05 μm24, 25; in such cases the corresponding number of wear particles would be higher than 10 17 .…”

Section: Resultsmentioning

confidence: 88%

Effect of the structure at the micrometer and nanometer scales on the light transmission of isotactic polypropylene

Zia

Androsch

Radusch

2010

J of Applied Polymer Sci

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The spherulitic superstructure, crystallinity, and structure and morphology of crystals of isotactic polypropylene were controlled by the conditions of melt crystallization and related to the transmittance of visible light. Spherulitic samples, which contained monoclinic lamellae, were prepared by slow cooling of the quiescent melt at rates lower than 10 K/s and by isothermal melt crystallization at temperatures between 373 and 413 K. Nonspherulitic specimens, which contained nonlamellar mesomorphic domains, in contrast, were obtained by rapid cooling of the melt with rates faster than 100 K/s. The crystallinity and the size of crystals were furthermore fine-tuned by subsequent annealing at elevated temperatures. Analysis of such films of different structure by ultraviolet-visible spectroscopy revealed that the light transmission was independent of (1) the fraction, (2) the internal structure, and (3) the size of the crystals. In contrast, the light transmission increased with decreasing size of spherulites and finally exceeded 90% in films of 100 lm thickness when spherulites were completely absent. The crystallinity and the structure and size of the crystals of the films of isotactic polypropylene could be adjusted within wide limits without affecting the light transmission.

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Can centrifugation affect the morphology of polyethylene wear debris?

Cited by 17 publications

References 12 publications

Phase structure evolution during mixing and processing of poly(lactic acid)/polycaprolactone (PLA/PCL) blends

Phase structure evolution during mixing and processing of poly(lactic acid)/polycaprolactone (PLA/PCL) blends

Nanometer size wear debris generated from ultra high molecular weight polyethylene in vivo

Effect of the structure at the micrometer and nanometer scales on the light transmission of isotactic polypropylene

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