کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1485920 1510546 2006 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Scaling of the local dynamics and the intermolecular potential
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Scaling of the local dynamics and the intermolecular potential
چکیده انگلیسی

The experimental fact that relaxation times, τ, of supercooled liquids and polymers are uniquely defined by the quantity TVγ, where T is temperature, V specific volume, and γ a material constant, leads to a number of interpretations and predictions concerning the dynamics of vitrification. Herein we examine means to determine the scaling exponent γ apart from the usual superpositioning of relaxation data. If the intermolecular potential can be approximated by an inverse power law, as implied by the TVγ scaling, various equations are derived relating γ to the Grüneisen parameter and to a common expression for the pressure derivative of the glass temperature. In addition, without assumptions, γ can be obtained directly from pressure-volume-temperature data. These methods for determining γ from molecular or thermodynamic properties are useful because they enable the P- and V-dependences of τ to be obtained, and thereby various analyses of the dynamics to be explored, without the need to carry out relaxation measurements beyond ambient pressure.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 352, Issues 42–49, 15 November 2006, Pages 4895–4899
نویسندگان
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