The role of shear and stabilizer on PLA degradation |
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| Institution: | 1. Chemistry Center/Department, University of Minho, Campus de Gualtar, 4710–057 Braga, Portugal;2. IPC — Institute for Polymers and Composites, I3N, University of Minho, Campus de Azurém, 4800–058 Guimarães, Portugal |
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| Abstract: | The role of temperature, shear and oxygen on PLA degradation was investigated. Thermo-mechanical degradation induces a larger decrease in PLA molecular weight than thermo-oxidative degradation. This was associated with different degradation processes (mainly chain scission) that took place under the two conditions. Given the PLA robustness to endure reprocessing, it was possible to conclude that the primary and secondary antioxidant (B900) had a synergetic effect on PLA stability. |
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| Keywords: | Thermal stability Poly(lactic acid) Shear B900 stabilizer Molecular weight |
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