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- W4205854751 abstract "Despite the tremendous endeavors devoted to exploiting the nature of glass transition, the factors that control the steepness index of viscosity near glass transition, that is, fragility, remain unclear. In this study, we demonstrate that, for polymeric and small molecular weight organic glass formers, fragility increases upward with increasing size of the free volume void at the glass transition temperature. This changing trend indicates that fragility is governed by the properties of the segments or molecular clusters in the free volume void rather than by the properties of the entire polymer chains. The physics behind the relationship between fragility and free volume void at the glass transition temperature is consistent with the physics behind the relationship between fragility and the molecular weight as well as the mechanics of the relationship between fragility and size of the cooperative units. This relationship also provides new insights into the understanding of the nature of the glass transition of polymeric and small molecular weight organic glass formers." @default.
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- W4205854751 date "2022-01-01" @default.
- W4205854751 modified "2023-10-17" @default.
- W4205854751 title "Correlation between fragility and free volume void size at glass transition temperature" @default.
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- W4205854751 doi "https://doi.org/10.1063/5.0069962" @default.
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