Poly (vinyl alcohol) / silica nanocomposites: morphology and thermal degradation kinetics

Peng, Zheng, Kong, Ling Xue, Li, Si-Dong and Spiridonov, Pavel 2006, Poly (vinyl alcohol) / silica nanocomposites: morphology and thermal degradation kinetics, Journal of nanoscience and nanotechnology, vol. 6, no. 12, pp. 3934-3938.

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Title Poly (vinyl alcohol) / silica nanocomposites: morphology and thermal degradation kinetics
Author(s) Peng, Zheng
Kong, Ling Xue
Li, Si-Dong
Spiridonov, Pavel
Journal name Journal of nanoscience and nanotechnology
Volume number 6
Issue number 12
Start page 3934
End page 3938
Publisher American Scientific
Place of publication Valencia, Calif.
Publication date 2006
ISSN 1533-4880
1533-4899
Keyword(s) poly(vinyl alcohol)
kinetics
thermal degradation
nanocomposite
silica
morphology
Summary The morphology of self-assembled poly(vinyl alcohol)/silica (PVA/SiO2) nanocomposites is investigated with atomic force microscopy (AFM) and transmission electron microscopy (TEM). It is found that the SiO2 nanoparticles are homogenously distributed throughout the PVA matrix in a form of spherical nano-cluster. The average size of the SiO2 clusters is below 50 nm at the low contents (SiO2 ≤ 5 wt%), while particle aggregations are clearly observed and their average size markedly increases to 110 nm when 10 wt% SiO2 is loaded. The thermogravimetric analysis (TGA) shows that the nanocomposite significantly outperforms the pure PVA in the thermal resistance. By using a multi-heating-rate method, the thermal degradation kinetics of the nanocomposite with a SiO2 content of 5 wt% is compared to the PVA host. The reaction activation energy (E) of the nanocomposite, similar to the pure PVA, is divided into two main stages corresponding to two degradation steps. However, at a given degradation temperature, the nanocomposite presents much lower reaction velocity constants (k), while its E is 20 kJ/mol higher than that of the PVA host.
Language eng
Field of Research 100708 Nanomaterials
091202 Composite and Hybrid Materials
HERDC Research category C1.1 Refereed article in a scholarly journal
Persistent URL http://hdl.handle.net/10536/DRO/DU:30026144

Document type: Journal Article
Collection: Institute for Technology Research and Innovation
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