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Study of thermodegradation and thermostabilization of poly(lactide acid) using subsequent extrusion cycles
Author(s) -
Amorin Nathalia S. Q. S.,
Rosa Gabriela,
Alves Jefferson Fernandes,
Gonçalves Suely P. C.,
Franchetti Sandra M. M.,
Fechine Guilhermino J. M.
Publication year - 2014
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.40023
Subject(s) - extrusion , fourier transform infrared spectroscopy , degradation (telecommunications) , melt flow index , reactive extrusion , chemical engineering , materials science , chemistry , size exclusion chromatography , lactic acid , polymer chemistry , nuclear chemistry , composite material , organic chemistry , polymer , copolymer , engineering , genetics , enzyme , telecommunications , biology , computer science , bacteria
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. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2014 , 131 , 40023.