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Size Effect of Al2O3 Nanowires on the Molecular Relaxation in Epoxy Composites

✍ Scribed by Wei-Tao Wan; De-Mei Yu; Long-Biao Huang; Yun-Chuan Xie; Xiu-Sheng Guo; Jing Zhang

Publisher
John Wiley and Sons
Year
2008
Tongue
English
Weight
219 KB
Volume
209
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

The size effect of Al~2~O~3~ nanowires on the molecular relaxation of an epoxy system was investigated by means of DSC and dielectric relaxation spectroscopy. T~g~ and activation energy of dielectric relaxation decreased with the incorporation of the nanowires. To explain the observed results, a coarse‐grained confined‐region structure model is proposed, and on the basis of this model, the change in molecular motion arising from the nanowires could be understood. The variations of thermal stability and water absorption for the nanocomposites were also discussed. These original experimental results should be helpful in scientific research and nanocomposite applications.

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✍ L.M. Epure; S. Dimitrievska; Y. Merhi; L.'H. Yahia πŸ“‚ Article πŸ“… 2007 πŸ› John Wiley and Sons 🌐 English βš– 806 KB

## Abstract Hydroxyapatite (HA) and HA‐alumina (HA/Al~2~O~3~) composites, with Al~2~O~3~ contents of 5, 10, 20, and 30%, were synthesized using a wet precipitation method and sintered at 900 and 1300Β°C. We investigated the effect of sintering temperature and relative concentration of HA and Al~2~O~