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A comparison between the bond-strength-coordination number fluctuation model and the random walk model of viscosity Ikeda, Masahiro 池田, 昌弘 イケダ, マサヒロ Ikeda 池田 イケダ Masahiro 昌弘 マサヒロ 安仁屋, 勝 Ndeugueu, Jean Ikeda, Masahiro Aniya, Masaru © Springer 430 Fragility Glass forming materials Glass transition Viscosity application/pdf 論文(Article) We have studied the temperature dependence of the viscosity of some polymeric materials by using both, the bond-strength-coordination number fluctuation model and the random walk model. The results reveal that both models show an excellent agreement with the experimental data. For the random walk model, two equations corresponding to two temperature regimes (low-T and high-T) separated by the critical temperature Tc, which is difficult to determine, are needed to describe the temperature dependence of the viscosity of a fragile system, whereas for the bond-strength-coordination number fluctuation model, a single equation with clear physical meaning describes the temperature dependence of the viscosity of both, the fragile and strong systems. We have also studied the relationship between the normalized temperature range of cooperativity and the fragility index. A theoretical expression for the relationship has been derived based on the bond-strength-coordination number fluctuation model. The comparison with the experimental data shows a good agreement, leading to the conclusion that the kinetic properties of glass forming liquids and the cooperativity of molecular relaxations are correlated. http://www.springerlink.com/content/c7682m1uh3vn1x16/ Springer 2010-01 eng journal article AM http://hdl.handle.net/2298/17129 https://kumadai.repo.nii.ac.jp/records/23670 10.1007/s10973-009-0420-x 1572-8943 http://www.springerlink.com/content/102948/?p=c8e408fd74bf4847b0e9876b5f673218&pi=0 AA11258936 Journal of Thermal Analysis and Calorimetry 99 1 33 38 https://kumadai.repo.nii.ac.jp/record/23670/files/JTAC 99(2010)33Manuscript-r.pdf application/pdf 250.9 kB 2020-03-02