1. Thermal and thermo-oxidative degradation kinetics and characteristics of poly (lactic acid) and its composites.
- Author
-
Lv S, Zhang Y, and Tan H
- Subjects
- Kinetics, Oxidative Stress, Temperature, Thermogravimetry, Lactic Acid, Polyesters
- Abstract
Thermal degradation behavior and kinetics of starch/PLA composites in an inert and oxygen atmosphere were investigated by TG and TG-FTIR techniques. It is shown that the thermal degradation process can be divided into three stages, and a significant difference between thermal and thermo-oxidative degradation is the third stage in which the residual chars are further cracked for the thermo-oxidative degradation. The activation energy was calculated using the iso-conversional Flynn-Wall-Ozawa (FWO) method. The lower activation energy for thermo-oxidative degradation indicated that oxygen had an accelerated effect on thermal degradation. The variation of activation energy indicated that the decomposition of all the samples was a complex process that included at least two different mechanisms. Evolution of the evolved gaseous products with temperature was studied to understand the thermal and thermo-oxidative decomposition comprehensively. According to the TG-FTIR analysis, the gaseous products mainly contained lactide, cyclic oligomers, aldehydes, CO
2 , CO, and H2 O., (Copyright © 2019 Elsevier Ltd. All rights reserved.)- Published
- 2019
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