The influence of gamma radiation on the glass transition of hydroxyapatite/poly L-lactide composite
Apstrakt
Hydroxyapatite/poly L-lactide (HAp/PLLA) is a composite biomaterial which has been widely utilized for substitution and reparation of the hard bone tissue. It is well known that gamma irradiation has been successfully employed in the modification/sterilization of such porous composites and that it has advantages over other procedures. In this study, differential scanning calorimetry (DSC) measurements were made to investigate the influence of the radiation on glass transition behavior and structural relaxation, as well as to estimate the activation energy for this process. The apparent activation energy Delta H* for structural relaxation in the glass transition region was determined on the basis of the heating rate dependence of the glass transition temperature T-g. Furthermore, the results were correlated with those obtained by gel permeation chromatography (GPC). Our findings support the fact that the radiation-induced chain scission in the PLLA phase is the main reason for the decre...ase of the glass transition temperature and/or activation energy with the absorbed dose.
Ključne reči:
apparent activation energy / gamma radiation / glass transition / hydroxyapatite/poly L-lactideIzvor:
Materials Science Forum, 2007, 555, 497-502Napomena:
- Research Trends in Contemporary Materials Science, 8th Conference of the Yugoslav-Materials-Research-Society (Yu-MRS), Sep 04-08, 2006, Herceg Novi, Montenegro
DOI: 10.4028/www.scientific.net/MSF.555.497
ISSN: 0255-5476
WoS: 000249653700080
Scopus: 2-s2.0-38349039444
Kolekcije
Institucija/grupa
VinčaTY - JOUR AU - Miličević, Dejan S. AU - Trifunovic, S. AU - Ignjatović, Nenad L. AU - Suljovrujić, Edin H. PY - 2007 UR - https://vinar.vin.bg.ac.rs/handle/123456789/6697 AB - Hydroxyapatite/poly L-lactide (HAp/PLLA) is a composite biomaterial which has been widely utilized for substitution and reparation of the hard bone tissue. It is well known that gamma irradiation has been successfully employed in the modification/sterilization of such porous composites and that it has advantages over other procedures. In this study, differential scanning calorimetry (DSC) measurements were made to investigate the influence of the radiation on glass transition behavior and structural relaxation, as well as to estimate the activation energy for this process. The apparent activation energy Delta H* for structural relaxation in the glass transition region was determined on the basis of the heating rate dependence of the glass transition temperature T-g. Furthermore, the results were correlated with those obtained by gel permeation chromatography (GPC). Our findings support the fact that the radiation-induced chain scission in the PLLA phase is the main reason for the decrease of the glass transition temperature and/or activation energy with the absorbed dose. T2 - Materials Science Forum T1 - The influence of gamma radiation on the glass transition of hydroxyapatite/poly L-lactide composite VL - 555 SP - 497 EP - 502 DO - 10.4028/www.scientific.net/MSF.555.497 ER -
@article{ author = "Miličević, Dejan S. and Trifunovic, S. and Ignjatović, Nenad L. and Suljovrujić, Edin H.", year = "2007", abstract = "Hydroxyapatite/poly L-lactide (HAp/PLLA) is a composite biomaterial which has been widely utilized for substitution and reparation of the hard bone tissue. It is well known that gamma irradiation has been successfully employed in the modification/sterilization of such porous composites and that it has advantages over other procedures. In this study, differential scanning calorimetry (DSC) measurements were made to investigate the influence of the radiation on glass transition behavior and structural relaxation, as well as to estimate the activation energy for this process. The apparent activation energy Delta H* for structural relaxation in the glass transition region was determined on the basis of the heating rate dependence of the glass transition temperature T-g. Furthermore, the results were correlated with those obtained by gel permeation chromatography (GPC). Our findings support the fact that the radiation-induced chain scission in the PLLA phase is the main reason for the decrease of the glass transition temperature and/or activation energy with the absorbed dose.", journal = "Materials Science Forum", title = "The influence of gamma radiation on the glass transition of hydroxyapatite/poly L-lactide composite", volume = "555", pages = "497-502", doi = "10.4028/www.scientific.net/MSF.555.497" }
Miličević, D. S., Trifunovic, S., Ignjatović, N. L.,& Suljovrujić, E. H.. (2007). The influence of gamma radiation on the glass transition of hydroxyapatite/poly L-lactide composite. in Materials Science Forum, 555, 497-502. https://doi.org/10.4028/www.scientific.net/MSF.555.497
Miličević DS, Trifunovic S, Ignjatović NL, Suljovrujić EH. The influence of gamma radiation on the glass transition of hydroxyapatite/poly L-lactide composite. in Materials Science Forum. 2007;555:497-502. doi:10.4028/www.scientific.net/MSF.555.497 .
Miličević, Dejan S., Trifunovic, S., Ignjatović, Nenad L., Suljovrujić, Edin H., "The influence of gamma radiation on the glass transition of hydroxyapatite/poly L-lactide composite" in Materials Science Forum, 555 (2007):497-502, https://doi.org/10.4028/www.scientific.net/MSF.555.497 . .