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- Title
Kinetic study of thermal degradation of poly( l-lactide) filled with β-zeolite.
- Authors
Ye, Qiao-qiao; Huang, Zhen; Hao, Yu-hua; Wang, Jing-wen; Yang, Xin-yu; Fan, Xing-yue
- Abstract
The thermal features and decomposition kinetics of poly( l-lactide) (PLA) filled with β-zeolite have been studied through differential thermal analysis measurements and thermogravimetric analysis. The experimental data were collected under nitrogen atmosphere with the heating rates of 5-30 K min, and the thermal degradation of PLA/β-zeolite composites is observed to mainly occur in the temperature range of 550-675 K. The incorporation of β-zeolite has been found to make the onset thermal decomposition temperature of PLA obviously decrease. With the Flynn-Wall-Ozawa method, the activation energy E of the composites has been estimated and the β-zeolite composites have required higher E values for thermal decomposition reaction than pure PLA. The pre-exponential factor ln A can be readily obtained so as to establish the thermal conversion curves if the first-order mechanism is taken. Simulated results reflect that the first-order reaction mechanism has led to certain large deviations at the low conversion levels. By scanning the well-known 27 mechanism functions, the D mechanism of Zhuravlev, Lesokhin, Tempelman equation is found to be the most suitable mechanism for the description of the thermal decomposition of PLA and its β-zeolite counterparts. Along with the Flynn-Wall-Ozawa method, the D mechanism has performed excellently to establish all the conversion curves over the whole range, resulting in more satisfactory simulation results than the first-order reaction mechanism.
- Subjects
THERMAL stability; DIFFERENTIAL thermal analysis; THERMOGRAVIMETRY; HEATING; CHEMICAL reactions
- Publication
Journal of Thermal Analysis & Calorimetry, 2016, Vol 124, Issue 3, p1471
- ISSN
1388-6150
- Publication type
Article
- DOI
10.1007/s10973-016-5314-0