Journal ArticleDOI
Newtonian shear viscosity of polymeric melts
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TLDR
In this article, a new relationship has been found for the Newtonian viscosity of polymeric melts as a function of temperature and of chemical structure of the polymer unit, expressed graphically.Abstract:
A new relationship has been found for the Newtonian viscosity of polymeric melts as a function of temperature and of chemical structure of the polymer unit. The viscosity-temperature correlation is expressed graphically. The activation energy of viscous flow at high temperatures can be derived from a newly found additive property, viz. the molar viscosity-temperature function.
Es wurde eine neue Beziehung zwischen der Newtonschen Viskositat von Polymerschmelzen und der chemischen Struktur der Polymereinheit gefunden. Die Korrelation zwischen Viskositat und Temperatur wird grafisch dargestellt. Die Aktivierungsenergie der viskosen Stromung bei hohen Temperature last sich aus einer neuen additiven Eigenschaft, der „molaren Viskositats-Temperatur-Funktion”, ableiten.read more
Citations
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Crystallization processes in quiescent and moving polymer melts under heat transfer conditions
Journal ArticleDOI
Theory of dynamic barriers, activated hopping, and the glass transition in polymer melts.
TL;DR: A statistical mechanical theory of collective dynamic barriers, slow segmental relaxation, and the glass transition of polymer melts is developed by combining methods of mode coupling, density functional, and activated hopping transport theories.
Journal ArticleDOI
Lubrication properties of polyalphaolefin and polysiloxane lubricants: Molecular structure-tribology relationships
TL;DR: In this article, the rheological properties, elastohydrodynamic film thickness, and friction coefficients of several commercially available polyalphaolefin (PAO) and polydimethylsiloxane (PDMS)-based lubricants were investigated to assess relationships between molecular structure and lubricant performance.
Journal ArticleDOI
Quantifying Changes in the High-Frequency Dynamics of Mixtures by Dielectric Spectroscopy †
TL;DR: A general theoretical framework for quantifying changes in the "high-frequency" relaxation dynamics of mixtures is developed based on classical transition state theory, in conjunction with mathematical statements regarding the dependence of the entropy and enthalpy of activation of the high-frequency relaxation time on diluent mass fraction, X(w).
Journal ArticleDOI
Universal scaling, dynamic fragility, segmental relaxation, and vitrification in polymer melts.
TL;DR: The theory of dynamic barriers, slow relaxation, and the glass transition of polymers melts is numerically applied using parameters relevant to real materials and the numerical results are found to be in qualitative agreement with all the approximate analytic expressions previously derived with quantitative differences.
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