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Large deformation compression induced crystallinity degradation of conventional and highly crosslinked UHMWPEs

Paper ID Volume ID Publish Year Pages File Format Full-Text
10962 711 2005 10 PDF Available
Title
Large deformation compression induced crystallinity degradation of conventional and highly crosslinked UHMWPEs
Abstract

The effect of a large compressive plastic deformation on the melt temperature (Tm), lamellar thickness, crystallinity, and density of four UHMWPEs (two conventional and two highly crosslinked) was examined. The materials were prepared from a single batch of medical grade GUR 1050 resin (Ticona, Bayport, TX, USA). The two conventional UHMWPEs were as-received (virgin) and gamma radiation sterilized at 30 kGy in a nitrogen atmosphere (radiation sterilized). The two highly crosslinked UHMWPEs were each irradiated at 100 kGy and then post-processed with one of either two thermal treatments: annealing, which was done below the melt transition temperature (Tm), at 110 °C for 2 h (110 °C-annealed); and, remelting, which was done above Tm, at 150 °C (150 °C-remelted). Differences in changes upon compression between the materials were examined using ANCOVA analyses. The 150 °C-remelted material showed a significant change in Tm and lamellar thickness upon compressive plastic deformation whereas the other three UHMWPE materials did not. However, all of the materials showed significantly decreased crystallinity and density upon compressive deformation. The findings of this study support that microstructural evolution during compressive deformation is a function of UHMWPE formulation, as affected by irradiation and post-irradiation heat treatment.

Keywords
UHMWPE; Crosslinking; Compression; Differential scanning calorimetry; Melt temperature; Lamellar thickness; Crystallinity; Density
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Large deformation compression induced crystallinity degradation of conventional and highly crosslinked UHMWPEs
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 26, Issue 33, November 2005, Pages 6430–6439
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us