Thermal and crystallization behaviour of gamma irradiated PLLA
Abstract
Structure, crystallization behaviour and some thermal properties of poly-L-lactide (PLLA), gamma irradiated up to 300 kGy, have been studied. Through differential scanning calorimetry measurements, radiation-induced changes were evident in the enthalpy of melting and cold crystallization, as well as in the degree of crystallinity. Decay of the glass transition, cold crystallization and melting temperatures with irradiation dose was observed in all cases. The annealing treatment, which can substantially reduce the concentration of free radicals, also had a great impact on thermal/crystallization behaviour of irradiated PLLA. Extensive chain scission, as a dominant effect of gamma irradiation, confirmed by gel permeation chromatography, has as a consequence a growth of new thin crystal lamellae and occurrence of the second low-temperature melting peak. Thermogravimetric analyses have shown that irradiation lowered the thermal stability of PLLA. (c) 2007 Elsevier Ltd. All rights reserved.
Keywords:
gamma irradiation / poly-L-lactide / thermal propertiesSource:
Radiation Physics and Chemistry, 2007, 76, 8-9, 1376-1380Note:
- 11th Tihany Symposium on Radiation Chemistry, Aug 26-31, 2006, Eger, Hungary
DOI: 10.1016/j.radphyschem.2007.02.035
ISSN: 0969-806X
WoS: 000247771000034
Scopus: 2-s2.0-34249056904
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Institution/Community
VinčaTY - JOUR AU - Miličević, Dejan S. AU - Trifunovic, S. AU - Galović, Slobodanka AU - Suljovrujić, Edin H. PY - 2007 UR - https://vinar.vin.bg.ac.rs/handle/123456789/6666 AB - Structure, crystallization behaviour and some thermal properties of poly-L-lactide (PLLA), gamma irradiated up to 300 kGy, have been studied. Through differential scanning calorimetry measurements, radiation-induced changes were evident in the enthalpy of melting and cold crystallization, as well as in the degree of crystallinity. Decay of the glass transition, cold crystallization and melting temperatures with irradiation dose was observed in all cases. The annealing treatment, which can substantially reduce the concentration of free radicals, also had a great impact on thermal/crystallization behaviour of irradiated PLLA. Extensive chain scission, as a dominant effect of gamma irradiation, confirmed by gel permeation chromatography, has as a consequence a growth of new thin crystal lamellae and occurrence of the second low-temperature melting peak. Thermogravimetric analyses have shown that irradiation lowered the thermal stability of PLLA. (c) 2007 Elsevier Ltd. All rights reserved. T2 - Radiation Physics and Chemistry T1 - Thermal and crystallization behaviour of gamma irradiated PLLA VL - 76 IS - 8-9 SP - 1376 EP - 1380 DO - 10.1016/j.radphyschem.2007.02.035 ER -
@article{ author = "Miličević, Dejan S. and Trifunovic, S. and Galović, Slobodanka and Suljovrujić, Edin H.", year = "2007", abstract = "Structure, crystallization behaviour and some thermal properties of poly-L-lactide (PLLA), gamma irradiated up to 300 kGy, have been studied. Through differential scanning calorimetry measurements, radiation-induced changes were evident in the enthalpy of melting and cold crystallization, as well as in the degree of crystallinity. Decay of the glass transition, cold crystallization and melting temperatures with irradiation dose was observed in all cases. The annealing treatment, which can substantially reduce the concentration of free radicals, also had a great impact on thermal/crystallization behaviour of irradiated PLLA. Extensive chain scission, as a dominant effect of gamma irradiation, confirmed by gel permeation chromatography, has as a consequence a growth of new thin crystal lamellae and occurrence of the second low-temperature melting peak. Thermogravimetric analyses have shown that irradiation lowered the thermal stability of PLLA. (c) 2007 Elsevier Ltd. All rights reserved.", journal = "Radiation Physics and Chemistry", title = "Thermal and crystallization behaviour of gamma irradiated PLLA", volume = "76", number = "8-9", pages = "1376-1380", doi = "10.1016/j.radphyschem.2007.02.035" }
Miličević, D. S., Trifunovic, S., Galović, S.,& Suljovrujić, E. H.. (2007). Thermal and crystallization behaviour of gamma irradiated PLLA. in Radiation Physics and Chemistry, 76(8-9), 1376-1380. https://doi.org/10.1016/j.radphyschem.2007.02.035
Miličević DS, Trifunovic S, Galović S, Suljovrujić EH. Thermal and crystallization behaviour of gamma irradiated PLLA. in Radiation Physics and Chemistry. 2007;76(8-9):1376-1380. doi:10.1016/j.radphyschem.2007.02.035 .
Miličević, Dejan S., Trifunovic, S., Galović, Slobodanka, Suljovrujić, Edin H., "Thermal and crystallization behaviour of gamma irradiated PLLA" in Radiation Physics and Chemistry, 76, no. 8-9 (2007):1376-1380, https://doi.org/10.1016/j.radphyschem.2007.02.035 . .