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Effect of γ-irradiation on the structure of poly(ethyl acrylate-co-hydroxyethyl methacrylate) copolymer networks for biomedical applications

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Abstract

The effect of the sterilization process by γ-irradiation on the structure of poly(ethyl acrylate-co-hydroxyethyl methacrylate) copolymer networks, P(EA-co-HEMA) is studied for a broad dose range (7, 15, 25 and 50 kGy) and copolymer composition interval (0, 0.3, 0.5, 0.7 and 1 weight fraction of HEMA in the copolymer). γ-irradiation promotes chain scission in PHEMA homopolymer but induces new crosslinking points in PEA homopolymer. Both effects are present in the copolymers, with a net result that depends on composition. For copolymers with high HEMA fractions chain scission predominates, while, as the amount of EA in the copolymer increases, the situation changes and the net effect turns out to be an increase in the number of elastically active chains. Further, γ-irradiation strengthens the γ relaxation in PHEMA homopolymer, what suggest that the number of interchain hydrogen bonds decreases. FTIR spectroscopy reveals no oxidation as a consequence of the sterilization process.

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Acknowledgments

Authors acknowledge the support of the Generalitat Valenciana through the GV04A/345 project and the support to their research group by the Generalitat Valenciana through the Gupos03/018 project.

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Authors and Affiliations

  1. Center for Biomaterials, Universidad Politécnica de valencia, 46022, Valencia, Spain

    Raúl Brígido Diego, Manuel Salmerón Sánchez, José Luis Gómez Ribelles & Manuel Monleón Pradas

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  1. Raúl Brígido Diego
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  2. Manuel Salmerón Sánchez
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  3. José Luis Gómez Ribelles
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  4. Manuel Monleón Pradas
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Correspondence to Manuel Salmerón Sánchez.

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Brígido Diego, R., Salmerón Sánchez, M., Gómez Ribelles, J.L. et al. Effect of γ-irradiation on the structure of poly(ethyl acrylate-co-hydroxyethyl methacrylate) copolymer networks for biomedical applications. J Mater Sci: Mater Med 18, 693–698 (2007). https://doi.org/10.1007/s10856-006-0008-y

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  • DOI: https://doi.org/10.1007/s10856-006-0008-y

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