Free radical kinetics in a plasma immersion ion implanted polystyrene: Theory and experiment

Kosobrodova, Elena; Kondyurin, Alexey; Fisher, Karen R.; Moeller, W.; McKenzie, David R.; Bilek, M.M.M.

doi:10.1016/j.nimb.2012.02.028

Cited by 62 publications

(66 citation statements)

References 35 publications

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“…Detailed analysis of structural-mechanical properties of the treated surfaces (roughness, fractal and wave properties, elastic modulus) and the cross-sections of the modified layer are given in the work [19]. In particular, the elastic modulus of the surface, determined by the AFM nanoindentation, increases with the plasma energy and fluence and was 20 MPa for the untreated PU, 125 MPa (PIII 1-16), 254 MPa (1-17) and 1900 MPa (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17).…”

Section: Resultsmentioning

confidence: 99%

“…Certain treatment regimens allow creating discontinuous cluster-like carbon coatings [7] with selective adsorption of blood proteins. As a result of ion-plasma implantation free radicals appear in the treated surface layer [8], some authors suppose that it makes the surface more favorable for the proteins [9]. The usage of silver [10] or copper [11] ions improves the antimicrobial properties.…”

Section: Introductionmentioning

confidence: 99%

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The Fracture of Plasma-Treated Polyurethane Surface under Fatigue Loading

et al. 2018

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Plasma treatment of soft polymers is a promising technique to improve biomedical properties of the materials. The response to the deformation of such materials is not yet clear. Soft elastic polyurethane treated with plasma immersion ion implantation is subjected to fatigue uniaxial loading. The influence of the strain amplitude and the plasma treatment regime on damage character is discussed. Surface defects are studied in unloaded and stretched states of the material. As a result of fatigue loading, transverse cracks (with closed overlapping edges as well as with open edges deeply propagating into the polymer) and longitudinal folds which are break and bend inward, appear on the surface. Hard edges of cracks cut the soft polymer which is squeezed from the bulk to the surface. The observed damages are related to the high stiffness of the modified surface and its transition to the polymer substrate.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Fracture of Plasma-Treated Polyurethane Surface under Fatigue Loading

et al. 2018

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“…Generated products are unstable and susceptible to degradation. However, some radicals with long‐term stability have also been identified when different polymers were exposed to the ionizing irradiation by γ‐rays, electron, or ion‐beam . So, reactivity and toxicity of degradation products must be taken into account.…”

Section: Membrane Modificationmentioning

confidence: 99%

Current Approaches in Improving Hemocompatibility of Polymeric Membranes for Biomedical Application

Salimi

Ghaee

Ismail

et al. 2016

Macro Materials & Eng

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Suitable membranes for blood‐contacting medical applications need to be resistant in confrontation with blood proteins and cells, while possessing high blood compatibility and permeability at the same time. Herein, an overview of the recent advances and strategies that have been used to enhance the hemocompatibility of polymeric membranes is provided. The review focuses on two modification strategies: (i) physical modifications and (ii) chemical modifications. It also highlights the current progress in the design of hemocompatible‐functionalized membranes for biomedical applications. Subsequently, the commonly applied biocompatibility tests are also discussed and finally the future perspectives of the application of polymeric membranes in the biomedical field are presented.

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“…As the bonds reform, reactive unpaired electrons are generated within the modified region. 33,34 These unpaired electrons are present in radicals that diffuse throughout the polymer to covalently react with molecules at the surface, 35 such as atmospheric oxygen 36 or biomolecules in solution. 37 PEEK, PIII treated under identical conditions as utilized in this study, exhibits dynamic properties characterized by progressive oxidation of the surface 36 and a decreasing concentration of radicals.…”

Section: Introductionmentioning

confidence: 99%

Plasma ion implantation enabled bio-functionalization of PEEK improves osteoblastic activity

et al. 2018

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Slow appositional growth of bone in vivo is a major problem associated with polyether ether ketone (PEEK) based orthopaedic implants. Early stage promotion of osteoblast activity, particularly bone nodule formation, would help to improve contact between PEEK implantable materials and the surrounding bone tissue. To improve interactions with bone cells, we explored here the use of plasma immersion ion implantation (PIII) treatment of PEEK to covalently immobilize biomolecules to the surface. In this study, a single step process was used to covalently immobilize tropoelastin on the surface of PIII modified PEEK through reactions with radicals generated by the treatment. Improved bioactivity was observed using the human osteoblast-like cell line, SAOS-2. Cells on surfaces that were PIII-treated or tropoelastin-coated exhibited improved attachment, spreading, proliferation, and bone nodule formation compared to cells on untreated samples. Surfaces that were both PIII-treated and tropoelastin-coated triggered the most favorable osteoblast-like responses. Surface treatment or tropoelastin coating did not alter alkaline phosphatase gene expression and activity of bound cells but did influence the expression of other bone markers including osteocalcin, osteonectin, and collagen I. We conclude that the surface modification of PEEK improves osteoblast interactions, particularly with respect to bone apposition, and enhances the orthopedic utility of PEEK.

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Free radical kinetics in a plasma immersion ion implanted polystyrene: Theory and experiment

Cited by 62 publications

References 35 publications

The Fracture of Plasma-Treated Polyurethane Surface under Fatigue Loading

The Fracture of Plasma-Treated Polyurethane Surface under Fatigue Loading

Current Approaches in Improving Hemocompatibility of Polymeric Membranes for Biomedical Application

Plasma ion implantation enabled bio-functionalization of PEEK improves osteoblastic activity

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