期刊
POLYMER DEGRADATION AND STABILITY
卷 101, 期 -, 页码 52-59出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2014.01.014
关键词
Poly(lactic acid); Montmorillonite; Nanocomposites; Enhanced kinetic model; General analytical equation; Random scission
资金
- Ministry of Science and Innovation of the Spanish Government [MAT2010-19721-C02-01]
- Spanish Ministry of Economy and Competitiveness [CTQ2011-27626]
An enhanced general analytical equation has been developed in order to evaluate the kinetic parameters of the thermal degradation of nanocomposites, composed of poly(lactic acid) (PLA) and organo-modified montmorillonite (OMMT) nanoparticles. This improvement has consisted of replacing the n-order conversion function by a modified form of the Sestak-Berggren equation f(alpha) = c (1 - alpha)(n)alpha(m)are that led to a better adjustment of experimental data and also adequately represented the conventional mechanisms for solid-state processes. The kinetic parameters so obtained have been compared to those determined by conventional differential and isoconversional methods. Given that the thermal degradation of PLA has been argued to be caused by random chain scission reactions of ester groups, the conversion function f(alpha) = L (L - 1)x(1 - x)(L-1), corresponding to a random scission mechanism, has been tested. Once optimized the kinetic model, the thermal degradation kinetics of nanocomposites (0.5 and 2.5% of OMMT) was compared to that of the polymer matrix. Moreover, the thermal stability of nanocomposites was tested and compared to that of the polymer matrix. (C) 2014 Elsevier Ltd. All rights reserved.
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