Journal
POLYMER DEGRADATION AND STABILITY
Volume 98, Issue 12, Pages 2556-2563Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2013.09.016
Keywords
Ecoflex; Aromatic-aliphatic copolyester; Polylactide; Photodegradation; Thermogravimetry; Chemiluminescence
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Funding
- Grant Agency of the Czech Republic [GACR P108/10/0200]
- Internal Grant Agency of Tomas Bata University in Zlin [IGA/FT/2013/013]
- European Regional Development Fund (ERDF)
- National Budget of the Czech Republic, within the framework of the project Centre of Polymer Systems [CZ.1.05/2.1.00/03.0111]
- Grant Agency VEGA [2/0147/12]
- HUSK programme [1101/1.2.1/0209]
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The chemiluminescence of UV irradiated aromatic-aliphatic polyesters (Ecoflex and PBAT) and polylactic acid (PLA) was examined in nitrogen and oxygen atmospheres during the non-isothermal temperature runs in the interval from 40 to 250 degrees C and isothermally from 150 to 190 degrees C. The non-isothermal thermogravimetry and FTIR spectroscopy have been used for the characterization of differences in original samples. The temperature maxima of peroxidic peaks in nitrogen scaling their stability were compared and found to be in the order PBAT < Ecoflex < PLA. Their positions on the temperature scale that correlate well with the melting temperature of the respective polymer have been discussed. With prolongation of the UV irradiation period, the intensity of peroxidic peaks increased. On the other hand, the effect of pre-irradiation on non-isothermal runs of chemiluminescence measured in oxygen was not as distinct as for measurements in nitrogen. The deconvolution of the non-isothermal chemiluminescence runs in nitrogen revealed two kinds of peroxides in irradiated samples. (C) 2013 Elsevier Ltd. All rights reserved.
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