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• W2915173845 abstract "Poly(lactic) acid (PLA), is a compostable thermoplastic which degrades fast under composting conditions of microorganisms, high humidity, and temperatures. However, PLA degrades slowly below its glass transition temperature and in low humidity, hence, when used as short-shelf life product containers and not disposed to composting systems, PLA may cause environmental pollution. Therefore, when not disposed to proper waste management systems, the effect of long incubation time at room temperature on mechanical and thermal properties of PLA is the main concern of this study. To determine the effect of room temperature on semi-crystalline PLA degradation at a low humidity percentage, PLA films (PLA2) were kept at room temperature for 5 years at 40?10% humidity. Some PLA films (PLA3) were pre-treated at 55?C under dry conditions for one year and then kept at room temperature for four years. Influence of incubation time and temperature on PLA degradation was evaluated by mechanical, thermal analyses and by FTIR spectroscopy analysis and compared with the initial PLA samples (PLA1). Mainly mechanical properties of PLA were affected by incubation temperature and time since 68% tensile strength loss was observed in PLA3 samples which were pre-treated at 55?C and 34% decrease in tensile strength was observed in PLA2 samples. Ther?mal behavior of PLA was also influenced by incubation time and temperature as degree of crystallinity decreased 5% and 3% in PLA2 and PLA3 samples, respectively. Deformation of CH bonds and amorphous phase degradation were revealed by FTIR analyses in PLA2 and PLA3 samples." @default.
• W2915173845 created "2019-03-02" @default.
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• W2915173845 creator A5067164272 @default.
• W2915173845 date "2019-01-01" @default.
• W2915173845 modified "2023-10-16" @default.
• W2915173845 title "Influence of time and room temperature on mechanical and thermal degradation of poly(lactic) acid" @default.
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• W2915173845 doi "https://doi.org/10.2298/tsci181111051k" @default.
• W2915173845 hasPublicationYear "2019" @default.
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