Oxidative degradation of polylactide (PLA) and its effects on physical and mechanical properties - Archive ouverte HAL Access content directly
Journal Articles European Polymer Journal Year : 2014

Oxidative degradation of polylactide (PLA) and its effects on physical and mechanical properties

Abstract

The thermo-oxidative degradation of polylactide (PLA) films was studied between 70 and 150 C. It was shown that the oxidative degradation of PLA leads to a random chain cission responsible for a reduction of the molar mass. These molar mass changes affect Tg and the degree of crystallinity, and it was found that Tg 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 Mn falls below 40 kg mol 1 in agreement with relationships linking the critical value for embrittlement with the molar mass between entanglements.
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Dates and versions

hal-00977105 , version 1 (10-04-2014)

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Damien Rasselet, Alexandre Ruellan, Alain Guinault, Guillaume Miquelard-Garnier, Cyrille Sollogoub, et al.. Oxidative degradation of polylactide (PLA) and its effects on physical and mechanical properties. European Polymer Journal, 2014, 50 (1), pp.109-116. ⟨10.1016/j.eurpolymj.2013.10.011⟩. ⟨hal-00977105⟩
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