Thermo-oxidative degradation kinetics and mechanism of the system epoxy nanocomposite reinforced with nano-Al2O3
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- 作者：Omid Zabihi (1)
Abdollah Omrani (1) omrani@umz.ac.ir
Abbas Ali Rostami (1) - 关键词：Thermal degradation kinetics – ; Kinetic models – ; Epoxy nanocomposite – ; TG
- 刊名：Journal of Thermal Analysis and Calorimetry
- 出版年：2012
- 出版时间：June 2012
- 年：2012
- 卷：108
- 期：3
- 页码：1251-1260
- 全文大小：813.6 KB
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- 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Sciences
Polymer Sciences
Physical Chemistry
Inorganic Chemistry
Measurement Science and Instrumentation - 出版者：Akad茅miai Kiad贸, co-published with Springer Science+Business Media B.V., Formerly Kluwer Academic
- ISSN：1572-8943
文摘
We have synthesized epoxy nanocomposites with various percents of nanoalumina by using ultrasonic dispersion treatment. Scanning calorimetry studies revealed that the composition having 1% nanoalumina results in the highest value of cross-link density as evidenced by the glass transition temperature (T g). Thermal degradation of the systems consisting of diglycidyl ether bisphenol A (DGEBA)/1,3-Poropane diamine and with 1% and without nanoalumina were studied by thermogravimetry analysis to determine the reaction mechanism in air. The obtained results indicated that a relatively low concentration of nanoalumina led to an impressive improvement of thermal stability of epoxy resin. The Coats–Redfern, Van Krevelen, Horowitz–Metzger, and Criado methods were utilized to find the solid state thermal degradation mechanism. Analysis of our experimental results suggests that the reaction mechanism is depending on the applied thermal history. For the nanocomposite, the mechanism was recognized to be one-dimensional diffusion (D1) reaction at low heating rates and it changes to be a random nucleation process with one nucleus on the individual particle (F1) at high heating speeds. The results also indicated that the degradation mechanism of organic phase is influenced by the presence of inorganic nanofiller.