A Comparative Study of Molecular Motion Cooperativity in Polymeric and Metallic Glass-Forming Liquids

Abstract:

In order to investigate the relationship between the bonding nature and the cooperative relaxation, a comparative study of the relaxation behavior in polymeric and metallic glass forming systems has been performed based on the Bond Strength–Coordination Number Fluctuation (BSCNF) model developed by the authors. In the present work, we studied the correlations between the fragility m, the Vogel temperature T₀, the degree of molecular cooperativity N_B, and the Kohlrausch exponent β_KWW. The results show that T₀ and N_B increase, whereas β_KWW decreases systematically with the increase of m. Reflecting the difference of the interatomic interactions of the materials considered, the analysis by the present study reveals that the value of N_B in ion-conducing polymers is about 5 times larger than that in metallic systems, and for each system, the material dependence of β_KWW is clearly seen in the fragility index m and the cooperativity N_B.

• Periodical: Materials Science Forum (Volume 879)
• Pages: 151-156
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.879.151
• Online since: November 2016
• Authors: Masaru Aniya*, Masahiro Ikeda, Sahara Sahara
• Keywords: Bulk Metallic Glasses (BMG), Cooperativity, Fragility, Kohlrausch Exponent, Polymer, Structural Relaxation, Supercooled Liquids, Vogel Temperature

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