Surface layer modification of ion bombarded HDPE

Bieliński, Dariusz M.; Lipiński, Piotr; Ślusarski, L.; Grams, Jacek; Paryjczak, T.; Jagielski, J.; Turos, A.; Madi, N.K.

doi:10.1016/j.susc.2004.06.196

Cited by 26 publications

(12 citation statements)

References 15 publications

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“…[9] Some possibilities for improving this polymer's properties were tested either by changing its bulk properties by irradiation or changing its surface properties by ion implantation. [10][11][12] Improvement in mechanical properties of polymers can be achieved by irradiation. [3,4] Kurtz et al reviewed the processing, sterilization, and cross-linking of UHMWPE for total joint arthroplasty.…”

Section: Introductionmentioning

confidence: 99%

Change in Structure of Ultrahigh Molecular Weight Polyethylene Due to Irradiation in Air and in Nitrogen

Al-Maadeed

2006

International Journal of Polymer Analysis and Characterization

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The change in the structure and properties of ultrahigh molecular weight polyethylene (UHMWPE) due to gamma irradiation has been studied in air and in a nitrogen atmosphere at different doses up to 400 kGy. Thermal analysis using differential scanning calorimetry (DSC) and swelling were used to monitor changes in crystallinity and cross-linking. New crystallites with different lamellae thicknesses were formed in samples irradiated in air. The samples irradiated in nitrogen did not show new crystallites unless irradiated at more than 200 kGy. Gel percentage and the Charlesby-Pinner equation were used to confirm the increase in cross-linking in the absence of oxygen.Characterization by all the techniques used indicated that irradiation in air causes the production of new crystallites due to oxidation, by which shorter molecular chains are formed and lamellar thickness increases. A lower degree of oxidation and scission occur in nitrogen, as confirmed by scanning electron microscopy (SEM) analysis, which allowed the determination of fracture shape and morphology. Fewer micro-voids and less brittleness were noticed in an oxygen-free environment. To gain more cross-linking, less production of crystalline regions, and more ductility, it is recommended that UHMWPE be irradiated in the absence of oxygen.

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Section: Introductionmentioning

confidence: 99%

Change in Structure of Ultrahigh Molecular Weight Polyethylene Due to Irradiation in Air and in Nitrogen

Al-Maadeed

2006

International Journal of Polymer Analysis and Characterization

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“…H/C content changes gradually from 2 (value characteristic for ethylene monomer units) down to 1 (representing acetylene monomer units) [4]. The latter form is the most likely the effect of trans-polymerization of polyethylene.…”

Section: Resultsmentioning

confidence: 98%

“…The laser power and the time of sample excitation were adjusted individually in order to obtain the best quality absorption spectra. The spectra were analyzed according to the procedure described elsewhere [4].…”

Section: Techniquesmentioning

confidence: 99%

Influence of ion bombardment on tribological properties of UHMWPE

et al. 2006

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Medical grade UHMWPE-s: GUR 1020 and 1050, were subjected to ion bombardment with H 2 + , He + , Ar + or Ag + of different energy and various doses. The work presents changes to micromechanical profiles and surface morphology (AFM, SEM) of polyethylenes due to the treatment. Mechanisms behind the modification have been proposed owing to structural and chemical analyses by s-SIMS, FTIR-IRS, confocal Raman microscopy and ''nuclear depth profiling''. Studies revealed that hardness of the surface layer increases due to radiolysis, probably leading to cross-polymerization of polyethylene. The depth of modification is limited to the penetration of ion beam, being dependent on a dose and a kind of ions applied. The treatment results additionally in oxidation, which together with a development of the surface geometry is responsible for its hydrofilization and, in some cases bacteriostatic character. Friction and wear of polyethylenes under a high load, adequate to extreme conditions of exploitation of hip joints, can be reduced even by three times, due to a proper ion beam treatment.

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“…It is commonly accepted, that this is the essential factor determining the biocompability of materials [12]. Detailed studies of the wettability of irradiated polymers showed, that the polar component of the surface energy can be increased by at least 20% leading to an increased wettability in water [13]. One should also note that the friction process of biomaterials takes place in a water-based medium.…”

Section: Wettabilitymentioning

confidence: 99%