Hydrogen bonding and dynamic crossover in polyamide-66: A molecular dynamics simulation study

Hossein Ali Karimi-Varzaneh, Paola Carbone, Florian Müller-Plathe

    Research output: Contribution to journalArticlepeer-review

    Abstract

    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 (∼ 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. © 2008 American Chemical Society.
    Original languageEnglish
    Pages (from-to)7211-7218
    Number of pages7
    JournalMacromolecules
    Volume41
    Issue number19
    DOIs
    Publication statusPublished - 14 Oct 2008

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