TY - JOUR
T1 - Effect of γ-irradiation on the structure of poly(ethyl acrylate-co-hydroxyethyl methacrylate) copolymer networks for biomedical applications
AU - Brígido Diego, Raúl
AU - Salmerón Sánchez, Manuel
AU - Gómez Ribelles, José Luis
AU - Monleón Pradas, Manuel
N1 - Funding Information:
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.
PY - 2007/5
Y1 - 2007/5
N2 - 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.
AB - 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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U2 - 10.1007/s10856-006-0008-y
DO - 10.1007/s10856-006-0008-y
M3 - Article
C2 - 17136603
AN - SCOPUS:34248550726
VL - 18
SP - 693
EP - 698
JO - Journal of Materials Science: Materials in Electronics
JF - Journal of Materials Science: Materials in Electronics
SN - 0957-4522
IS - 5
ER -