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The effects of changes of intermolecular coupling on glass transition dynamics in polymer thin films and glass-formers confined in nanometer pores

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Abstract.

Intermolecular coupling plays an important role in determining the dynamics and the mobility of polymeric and non-polymeric glass-formers. The breadth of the dispersion is an indicator of the intermolecular coupling strength. The coupling model relates intermolecular coupling through the breadth of the dispersion to the dynamics of bulk glass-formers. When a glass-former is confined in nanometer pores or in thin films and if there is absence of chemical and physical interactions with the wall, intermolecular coupling is reduced, resulting in an increase of mobility. The coupling model is used to account for such changes of relaxation time of 1) ortho-terphenyl and poly(dimethyl siloxane) confined in nanometer pores, 2) polymer thin film confined between two impenetrable walls from Monte Carlo simulation, and 3) polymer film confined by perfectly smooth and purely repulsive potential acting on the repeat units from molecular-dynamics simulation. The model continues to explain the opposite effects observed when there is an increase of intermolecular coupling due to the presence of chemical or physical interaction with the walls.

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Authors and Affiliations

  1. Naval Research Laboratory, DC 20375-5320, Washington, USA

    K. L. Ngai

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  1. K. L. Ngai
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Correspondence to K. L. Ngai.

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Received: 1 January 2003, Published online: 8 October 2003

PACS:

64.70.Pf Glass transitions - 68.60.Bs Mechanical and acoustical properties - 36.20.-r Macromolecules and polymer molecules

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Ngai, K.L. The effects of changes of intermolecular coupling on glass transition dynamics in polymer thin films and glass-formers confined in nanometer pores. Eur. Phys. J. E 12, 93–100 (2003). https://doi.org/10.1140/epje/i2003-10029-3

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