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Structural relaxation and fragility

Structural Relaxation and Fragility of Glass-Forming Miscible Blends Composed of Atactic Polystyrene and Poly(2,6-dimethyl-l,4-phenylene oxide)... [Pg.133]

Napolitano S, Wiibbenhorst M (2010) Structural relaxation and dynamic fragility of freely standing polymer films. Polymer 51 5309-5312... [Pg.106]

Paluch, M., Casalini, R., and Roland, C. M., Relative contributions of thermal energy and free volume to the temperature dependence of structural relaxation in fragile glass-forming liquids, Phys. Rev. B, 66, 092202-1 to 092202-3 (2002b). [Pg.469]

This relation enables evaluating the fragility parameter Ks as well as the structural relaxation times r over the whole temperamre range To < T < Ta-Because T] depends on polymer microstructure and molar mass, Ap likewise exhibits the same dependence. Computations of Ks within the entropy theory have not been possible before. [Pg.170]

Figure 7 Compari.son of structural relaxation times for fragile and strong glasses with glass transition temperatures of 70°C. The data were calculated using input data characteristic of sucrose except for the strength parameter, D. ( ) Strong glass (D = 23). ( ) Fragile gla.ss (D = 7). Figure 7 Compari.son of structural relaxation times for fragile and strong glasses with glass transition temperatures of 70°C. The data were calculated using input data characteristic of sucrose except for the strength parameter, D. ( ) Strong glass (D = 23). ( ) Fragile gla.ss (D = 7).
Structural relaxation times determined from enthalpy relaxation studies with sucrose and trehalose [37,50] are given in Figure 8. The structural relaxation times observed are qualitatively similar to those estimated for the fragile glass... [Pg.183]

Angell, C. A., Structural instability and relaxation in liquid and glassy phases near the fragile liquid limit. J. Non-Cryst Sol. 102,205 (1988). [Pg.76]

Structural relaxation times determined from enthalpy relaxation studies with sucrose and trehalose [39,53] are given in Figure 8. The structural relaxation times observed are qualitatively similar to those estimated for the fragile glass example in Figure 7. While there is considerable scatter in the data, it seems clear that the temperature dependence for sucrose is nonlinear and therefore non-Arrhenius. Insufficient data are available for trehalose to judge linearity. The trehalose structural... [Pg.109]

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