期刊
MACROMOLECULES
卷 41, 期 19, 页码 7211-7218出版社
AMER CHEMICAL SOC
DOI: 10.1021/ma8010685
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资金
- Alexander von Humboldt Foundation
- Deutsche Forschungsgemeinschaft
Using molecular dynamics simulations, we study the hydrogen bond dynamics and thermodynamics of the bulk of polyamide-66 over a broad temperature range (300-600 K). We show that different dynamic properties (the structure relaxation time, the orientational time correlation function of the amide groups, and the self-diffusion coefficient) of unentangled polyamide-66 undertake a crossover transition in the same small temperature range (similar to 413 K) above the experimental glass transition temperature (350 K). The data can be fitted to a Vogel-Fulcher-Tammann law when T > 413 K and to an Arrhenius equation when T < 413 K. Our results show that the global dynamics of polyamide-66 is intimately related to the relaxation of the hydrogen bond network formed among the amide groups. The presence of a dynamic crossover at a temperature slightly higher than the glass transition one is in agreement with the more recent experimental data and glass theories.
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