Evaluation of activation energy of viscous flow of sol–gel derived phenyl-modified silica glass
| Autor: | Hidekuni Ban-no, Ken-ichi Kurumada, Kohei Asaba, Yoshihiro Kamimura, Masahiko Hiro, Hisashige Kambara |
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| Rok vydání: | 2006 |
| Předmět: |
chemistry.chemical_classification
Activation energy Polymer Porous glass Condensed Matter Physics Condensed Matter::Disordered Systems and Neural Networks Electronic Optical and Magnetic Materials Amorphous solid Physics::Fluid Dynamics Condensed Matter::Soft Condensed Matter chemistry.chemical_compound Polymerization chemistry Chemical engineering Materials Chemistry Ceramics and Composites Polystyrene Glass transition Sol-gel |
| Zdroj: | Journal of Non-Crystalline Solids. 352:3175-3178 |
| ISSN: | 0022-3093 |
| DOI: | 10.1016/j.jnoncrysol.2006.05.020 |
| Popis: | The temperature-induced softening behavior in sol–gel derived phenyl-modified low-melting glass (phenyl glass) was investigated in terms of the activation energy for the viscous flow. The temperature dependence of the relative viscous flow was measured from the falling rate of a needle loaded with a constant weight. The activation energy for the viscous flow of phenyl-modified silica glass was found to be irrespective of the time of drying the sample phenyl-modified silica glass, which directly affects the extent of polymerization. Furthermore, the obtained activation energy was in considerably good agreement with that for the viscous flow of potassium alkali glass, and approximately twice larger than that of linear amorphous polymer (polystyrene). This result suggests the common microstructural feature of glassy materials interspaced by additive substances like Na/K or covalently bonded chemical functions such as phenyl groups. |
| Databáze: | OpenAIRE |
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