Hydrogen production in ?-ray and helium-ion radiolysis of polyethylene, polypropylene, poly(methyl-methacrylate), and polystyrene

Chang, Zheng; LaVerne, Jay A.

doi:10.1002/(sici)1099-0518(20000501)38:9<1656::aid-pola31>3.0.co;2-s

Cited by 38 publications

(25 citation statements)

References 32 publications

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“…Breaking of the polymer chains leads to an increased concentration of highly reactive radicals in the surface layer. This leads not only to an increased reactivity of the surface but also to crosslinking of the broken macromolecular chains, formation of double bonds and a release of gaseous degradation products [45,46]. The structures formed in the polymer by ion implantation are similar to those formed by pyrolysis, but they are found only in the surface layers of the polymer instead of in the entire bulk of the material [47].…”

Section: Ion Implantationmentioning

confidence: 99%

Surface Modification of Polymer Substrates for Biomedical Applications

2017

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While polymers are widely utilized materials in the biomedical industry, they are rarely used in an unmodified state. Some kind of a surface treatment is often necessary to achieve properties suitable for specific applications. There are multiple methods of surface treatment, each with their own pros and cons, such as plasma and laser treatment, UV lamp modification, etching, grafting, metallization, ion sputtering and others. An appropriate treatment can change the physico-chemical properties of the surface of a polymer in a way that makes it attractive for a variety of biological compounds, or, on the contrary, makes the polymer exhibit antibacterial or cytotoxic properties, thus making the polymer usable in a variety of biomedical applications. This review examines four popular methods of polymer surface modification: laser treatment, ion implantation, plasma treatment and nanoparticle grafting. Surface treatment-induced changes of the physico-chemical properties, morphology, chemical composition and biocompatibility of a variety of polymer substrates are studied. Relevant biological methods are used to determine the influence of various surface treatments and grafting processes on the biocompatibility of the new surfaces—mammalian cell adhesion and proliferation is studied as well as other potential applications of the surface-treated polymer substrates in the biomedical industry.

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Section: Ion Implantationmentioning

confidence: 99%

Surface Modification of Polymer Substrates for Biomedical Applications

2017

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“…Afterward, the energy of the ions rapidly disperses and breaks down the polymer chains leading to an increased concentration of highly reactive radicals in the substrate surface. Altogether, these radicals cause an increased reactivity of the surface layer, as well as to crosslinking of the fragmented polymer chains, double bond formation, and the evolution of gaseous degradation products [ 63 , 64 ]. The type of ions employed in biomedical applications is from noble gases and common elements (e.g., nitrogen, oxygen) that are found in biological tissues [ 65 , 66 ].…”

Section: Surface Functionalization Of Biomaterialsmentioning

confidence: 99%

Nanostructure-Enabled and Macromolecule-Grafted Surfaces for Biomedical Applications

et al. 2018

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Advances in nanotechnology and nanomaterials have enabled the development of functional biomaterials with surface properties that reduce the rate of the device rejection in injectable and implantable biomaterials. In addition, the surface of biomaterials can be functionalized with macromolecules for stimuli-responsive purposes to improve the efficacy and effectiveness in drug release applications. Furthermore, macromolecule-grafted surfaces exhibit a hierarchical nanostructure that mimics nanotextured surfaces for the promotion of cellular responses in tissue engineering. Owing to these unique properties, this review focuses on the grafting of macromolecules on the surfaces of various biomaterials (e.g., films, fibers, hydrogels, and etc.) to create nanostructure-enabled and macromolecule-grafted surfaces for biomedical applications, such as thrombosis prevention and wound healing. The macromolecule-modified surfaces can be treated as a functional device that either passively inhibits adverse effects from injectable and implantable devices or actively delivers biological agents that are locally based on proper stimulation. In this review, several methods are discussed to enable the surface of biomaterials to be used for further grafting of macromolecules. In addition, we review surface-modified films (coatings) and fibers with respect to several biomedical applications. Our review provides a scientific update on the current achievements and future trends of nanostructure-enabled and macromolecule-grafted surfaces in biomedical applications.

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“…This is the reason why most of the cation functional groups remained in their initial form (with H þ ) and did not lead to IR spectrum modifications. As for AmbOH and AmbH resins, molecular hydrogen was not produced by gamma radiolysis of the MB400 backbone because of its stability (Chang and LaVerne, 2000;Albano et al, 2003). Its formation was due to the degradation of interstitial and liquid water, the gamma radiolysis of the functional groups (-N þ (CH 3 ) 3 , À SO 3 H) and the radiation-induced degradation of radiolysis products (amines and sulfuric acid).…”

Section: Resins and Dosesmentioning

confidence: 99%

Experimental design approach for identification of the factors influencing the γ-radiolysis of ion exchange resins

Rébufa

Traboulsi

Labed

et al. 2015

Radiation Physics and Chemistry

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International audienceGamma radiolysis was investigated on a nuclear grade mixed bed ion exchange resin and its pure components under different irradiation conditions. Screening designs were performed to identify the factors influencing gas production after their γ-radiolysis and to compare their γ-degradation stability. Only hydrogen and trimethylamine quantities were considered as the response in the experimental designs. The other detected gases and water-soluble products were used to improve the resins degradation. Aerobic irradiation atmosphere decreased the H 2g production of AmbOH, MB400, and amines. The water presence increased the H 2g quantities for AmbH and decreased those for MB400 resin. Liquid water had no effect on H 2g production from AmbOH but was favorable to increased amine production. The H 2g production of AmbH increased with the absorbed dose that had little effect on the AmbOH resin. No impact of dose on the H 2g production was detected for MB400 that appeared to be less degraded

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Hydrogen production in ?-ray and helium-ion radiolysis of polyethylene, polypropylene, poly(methyl-methacrylate), and polystyrene

Cited by 38 publications

References 32 publications

Surface Modification of Polymer Substrates for Biomedical Applications

Surface Modification of Polymer Substrates for Biomedical Applications

Nanostructure-Enabled and Macromolecule-Grafted Surfaces for Biomedical Applications

Experimental design approach for identification of the factors influencing the γ-radiolysis of ion exchange resins

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