Publication: Thermal degradation mechanism of highly filled nano-SiO2 and polybenzoxazine
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Issued Date
2014
Resource Type
File Type
application/pdf
ISSN
13886150
Other identifier(s)
2-s2.0-84898835248
Rights Holder(s)
มหาวิทยาลัยศรีนครินทรวิโรฒ
Bibliographic Citation
Journal of Thermal Analysis and Calorimetry. Vol 116, No.1 (2014), p.435-446
Suggested Citation
Dueramae I., Jubsilp C., Takeichi T., Rimdusit S. Thermal degradation mechanism of highly filled nano-SiO2 and polybenzoxazine. Journal of Thermal Analysis and Calorimetry. Vol 116, No.1 (2014), p.435-446. doi:10.1007/s10973-013-3542-0 Retrieved from: https://hdl.handle.net/20.500.14740/6269
Author(s)
Abstract
Effects of high nano-SiO2 loading (up to 30 mass%) on polybenzoxazine (PBA-a) thermal degradation kinetics have been investigated using nonisothermal thermogravimetric analysis (TG). The DTG curves revealed three stages of thermal decomposition process in the neat PBA-a, while the first peak at low temperature was absent in its nanocomposites. As a consequence, the maximum degradation temperature of the nanocomposites shifted significantly to higher temperature as a function of the nano-SiO2 contents. Moreover, the degradation rate for every degradation stage was found to decrease with the increasing amount of the nano-SiO2. From the kinetics analysis, dependence of activation energy (E a) of the nanocomposites on conversion (α) suggests a complex reaction with the participation of at least two different mechanisms. From Coats-Redfern and integral master plot methods, the average E a and pre-exponential factor (A) of the nanocomposites showed systematically higher value than that of the PBA-a, likely from the shielding effect of the nanoparticles. The main degradation mechanism of the PBA-a was determined to be a random nucleation type with one nucleus on the individual particle (F1 model), while that of the PBA-a nanocomposite was the best described by diffusion-controlled reaction (D3 model). © 2013 Akadémiai Kiadó, Budapest, Hungary.
Subject(s)
Activation energy
Decomposition
Degradation
Enzyme kinetics
Kinetics
Pyrolysis
Thermogravimetric analysis
Degradation temperatures
Diffusion controlled reactions
Nano- SiO
Nonisothermal thermogravimetric analysis
Polybenzoxazine
Thermal decomposition process
Thermal degradation kinetics
Thermal degradation mechanism
Nanocomposites
Decomposition
Degradation
Enzyme kinetics
Kinetics
Pyrolysis
Thermogravimetric analysis
Degradation temperatures
Diffusion controlled reactions
Nano- SiO
Nonisothermal thermogravimetric analysis
Polybenzoxazine
Thermal decomposition process
Thermal degradation kinetics
Thermal degradation mechanism
Nanocomposites