Radiation-induced crosslinking of UHMWPE in the presence of co-agents: chemical and mechanical characterisation

Bracco, Pierangiola; Brunella, Valentina Giovanna; Luda, M. P.; Zanetti, Marco; Costa, Luigi

doi:10.1016/j.polymer.2005.08.095

Cited by 78 publications

(61 citation statements)

References 28 publications

(35 reference statements)

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“…Grafting on powder is considered a good experimental strategy for improving the uniformity and distribution of grafted vinyl benzene monomer throughout the amorphous sites of the polymer, where grafting takes place, which subsequent to film formation, allows a more uniform graft distribution of alkylamine groups [27][28]. The relationship between the DG of VBC into PE at 60 ºC with different pre-irradiation doses and monomer concentrations were studied as presented in Fig.…”

Section: Effect Of the Irradiation Dose And Monomer Concentration On mentioning

confidence: 99%

Polyethylene-based radiation grafted anion-exchange membranes for alkaline fuel cells

Sherazi

Sohn

Lee

et al. 2013

Journal of Membrane Science

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1016/j.memsci.2013.03.053 Science, 441, pp. 148-157, 2013-04-10 Polyethylene-based radiation grafted anion-exchange membranes for alkaline fuel cells Sherazi, Tauqir A.; Sohn, Joon Yong; Lee, Young Moo; Guiver, Michael D. Journal of Membrane AbstractVinyl benzyl chloride was grafted onto ultra-high molecular weight polyethylene powder (UHMWPE) by radiation grafting. The grafted powder was subsequently fabricated into membrane by melt pressing. The effect of absorbed radiation dose on the degree of grafting (DG) is discussed. The melt-flow properties of PVBC grafted PE with low degree of grafting was conducive to forming homogeneous pore-free membranes, which was confirmed by scanning electron microscopic analysis. The grafted polyethylene membranes were post functionalized with trimethylamine, followed by alkalization to obtain anion-exchange membranes (AEMs). The structures of the resulting AEMs were characterized by Fourier transform infrared spectroscopy, which showed that the grafted membranes were successfully functionalized. The properties of the AEMs, including ion exchange capacity, water uptake, in-plane swelling, methanol uptake, methanol permeability, and hydroxide ion conductivity were investigated. The AEMs showed reasonably good chemical stability, as evidenced by the ion exchange capacity being maintained for a long duration, even in highly alkaline conditions. The membranes exhibited a maximum ionic conductivity of 47.5 mS cm −1 at 90 °C (30 mS cm -1 at 60 °C).Methanol permeability was found to be in the order of 10 −8 cm 2 s -1 , which is considerably lower than that of Nafion ® . The membranes have useful properties consistent with anion exchange membranes suitable for alkaline fuel cells.

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Section: Effect Of the Irradiation Dose And Monomer Concentration On mentioning

confidence: 99%

Polyethylene-based radiation grafted anion-exchange membranes for alkaline fuel cells

Sherazi

Sohn

Lee

et al. 2013

Journal of Membrane Science

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“…However, its adverse properties such as creep, abrasion resistance, etc. are still a matter of concern [3]. Several research groups have observed that the mechanical properties of a polymer can be improved using small amount of nanofillers in it [4].…”

Section: Introductionmentioning

confidence: 99%

Graphene reinforced ultra high molecular weight polyethylene with improved tensile strength and creep resistance properties

Bhattacharyya¹,

Chen²,

Zhu³

2014

Express Polym. Lett.

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Abstract. Reduced graphene oxide or graphene was dispersed in ultra high molecular weight polyethylene (UHMWPE) using two methods to prepare nanocomposite films. In pre-reduction method, graphite oxide (GO) was exfoliated and dispersed in organic solvents and reduced to graphene before polymer was added, while reduction of graphene oxide was carried out after polymer addition for in situ reduction method. Raman spectroscopic study reveals that the second method results in better exfoliation of graphene but it has more amorphous content as evident from selected area electron diffraction (SAED) pattern, wide angle X-ray and differential scanning calorimetry (DSC). The nanocomposite film produced by prereduction method possesses higher crystallinity (almost the same as that of the pure film) as compared to the in situ method. It shows better modulus (increased from 864 to 1236 MPa), better strength (increased from 12.6 to 22.2 MPa), network hardening and creep resistance (creep strain reduced to 9% from 50% when 40% of maximum load was applied for 72 h) than the pure film. These findings show that graphene can be used for reinforcement of UHMWPE to improve its tensile and creep resistance properties.

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“…The γ-irradiation of the model hydrocarbons cyclohexane and n-octane which were widely accepted [19][20][21]. In case of cyclohexane, C-H cleavage leads to the formation of a hydrogen atom and a cyclohexyl radical (Scheme 1, reaction (1)).…”

Section: Discussionmentioning

confidence: 99%

Grafting of α-tocopherol upon γ-irradiation in UHMWPE probed by model hydrocarbons

Badertscher¹,

Lerf²,

Delfosse³

et al. 2012

Polymer Degradation and Stability

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Today, UHMWPE implants are stabilized with α-tocopherol and cross-linked by irradiation in order to reduce wear. Little is known about the structural transformation of the antioxidant α-tocopherol upon irradiation. In the present investigation, the major irradiation reaction products of α-tocopherol dissolved at 0.1 wt. % in liquid model hydrocarbons were characterized spectroscopically and by independent synthesis. We observed only a single product group, namely phenolic alkyl ethers formed by radical recombination of a phenoxyl radical with a secondary alkyl radical.The irradiation dose is the parameter which controls the amount of consumption of α-tocopherol. At a dose of 27.5 kGy, 31-34 % of α-tocopherol was transformed into the corresponding ether, while at 97.9 kGy, the degree of transformation was 68-76 %.The observed ether formation in the liquid model hydrocarbons explains two significant observations for the α-tocopherol stabilized polymers, namely depletion of the α-tocopherol"s phenol group upon irradiation and "grafting", i.e. formation of a chemical bond between the polymer and its antioxidant.

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Radiation-induced crosslinking of UHMWPE in the presence of co-agents: chemical and mechanical characterisation

Cited by 78 publications

References 28 publications

Polyethylene-based radiation grafted anion-exchange membranes for alkaline fuel cells

Polyethylene-based radiation grafted anion-exchange membranes for alkaline fuel cells

Graphene reinforced ultra high molecular weight polyethylene with improved tensile strength and creep resistance properties

Grafting of α-tocopherol upon γ-irradiation in UHMWPE probed by model hydrocarbons

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