Journal
EUROPEAN POLYMER JOURNAL
Volume 50, Issue -, Pages 109-116Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2013.10.011
Keywords
Polylactic acid; Polylactide; Ageing; Thermo-oxidation; Embrittlement
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The thermo-oxidative degradation of polylactide (PLA) films was studied between 70 and 150 degrees C. It was shown that the oxidative degradation of PLA leads to a random chain scission responsible for a reduction of the molar mass. These molar mass changes affect T-g and the degree of crystallinity, and it was found that T-g decreases according to the Fox-Flory theory whereas the degree of crystallinity increases due to a chemicrystallization process. A correlation between molar mass and strain at break during oxidation has been established: PLA displays a brittle behavior when M-n falls below 40 kg mol(-1) in agreement with relationships linking the critical value for embrittlement with the molar mass between entanglements. (C) 2013 Elsevier Ltd. All rights reserved.
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