Study of Thermodegradation and Thermostabilization of Poly( lactide acid) Using Subsequent Extrusion Cycles

作者：Amorin Nathalia S Q S; Rosa Gabriela; Alves Jefferson Fernandes; Goncalves Suely P C; Franchetti Sandra M M; Fechine Guilhermino J M^*

来源：Journal of Applied Polymer Science, 2014, 131(6): n/a-n/a.

DOI：10.1002/app.40023

<jats:title>ABSTRACT</jats:title><jats:p>The thermomechanical degradation and thermostabilization of poly(lactic acid) (PLA) have been studied using subsequent extrusion cycles under different temperature profiles. Primary and secondary antioxidants were used to avoid degradation process during extrusion. Melt flow index (MFI), size exclusion chromatography (SEC), and infrared spectroscopy (FTIR) analysis were used to evaluate the degradation and stabilization of PLA. The MFI and SEC analysis show that the main thermodegradation mechanism of PLA is governed by scission reactions. FTIR analysis confirmed the SEC results and showed that the synergetic effect between primary and secondary antioxidant is a suitable way to thermostabilize the PLA.

• 出版日期2014-3-15