Cox merz transformation
WebCox & Merz presented results for a polystyrene (PS) melt (M n = 79 kg/mol, M w = 340 kg/mol) and 13% and 20% solutions of polyisobutylene (PIB) in decalin and found that both eq. (1) and the forgotten consistency rule were both equally valid. In the original letter, Cox and Merz (Cox and Merz 1958) also introduced the following http://www.rheothing.com/2010/04/cox-merz-rule-rules.html
Cox merz transformation
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WebThe Cox- Merz rule is an empirical correlation that has been confirmed experimentally for several synthetic polymers (Ferry, 1980), and for solutions of several random-coil … WebMar 5, 2024 · Cox and Merz proposes that the viscosity (η) should be the same function of shear rate (\(\dot{\gamma }\)) as the modulus of complex viscosity │η * │is of angular velocity (w) . For Gunasekaran and Ak [ 60 ], the Cox-Merz correlation is the most reliable empirical method to estimate the relation between the dynamic and steady shear ...
WebMar 15, 2024 · Cox-Merz transformation for [EMIM][DCA] at 25 and 75 ºC. Acknowledgments. The authors acknowledge the Ministerio de Economía, Industria y Competitividad (MINECO, Spain), the EU FEDER Program (Grants # MAT2014-55384-P and # MAT2024-85130-P), and Fundación Séneca - Agencia de Ciencia y Tecnología de …
WebNov 16, 2024 · An easy way to obtain results at high shear rates in a rotational rheometer is to use the Cox-Merz rule. This empirical relationship stipulates that for most unfilled polymer melts, the shear viscosity, η, can … WebNational Center for Biotechnology Information
WebThe Cox-Merz empirical relationship between the linear (oscillatory) and nonlinear (steady-state) viscosities has been shown to be valid for many polymeric systems. Here, we present an equivalent expression to relate the linear (G′) and nonlinear (N 1) elastic properties of viscoelastic systems. Like the Cox-Merz relationship, it uses a combination of elastic and …
WebThe Cox-Merz relationship is an empirical relationship relating dynamic oscillatory data, such as that obtained from frequency sweeps, with steady-shear viscosity … rainer kattau stadeWebThe applicability of the Cox-Merz rule has recently been reviewed in detail [2]. It has been found to hold for almost all polymer melts, and concentrated and semi-dilute solutions. … rainer kaiser rheinauWebJul 25, 2024 · Cox–Merz relationship is an empirical relationship relating dynamic- and steady-state viscosities applicable mainly to polymer melts. Cox and Merz ( 1958 ) were the first researchers who observed that the steady-state viscosity at some shear rate ( \(\dot{\gamma}\) ) can be successfully related to the dynamic complex viscosity as follows: cvvhf medicalWebDec 3, 2008 · A slight rearrangement of the classical Cox and Merz rule suggests that the shear stress value of steady shear flow, \(\tau (\mathop \gamma \limits^. )\), and complex modulus value of small amplitude oscillatory shear, G ∗ (ω) = (G ′2 + G ″2) 1/2, are equivalent in many respects.Small changes of material structure, which express … rainer kamps hamminkelnWebJan 22, 2012 · The Cox–Merz rule and Laun’s rule are two empirical relations that allow the estimation of steady shear viscosity and first normal stress difference, respectively, using small amplitude oscillatory shear measurements. The validity of the Cox–Merz rule and Laun’s rule imply an agreement between the linear viscoelastic response measured in … rainer kattelWebDec 12, 2014 · Then, the Cox–Merz transformation is used to obtain the viscosity (η expressed in Pa·s) as a function of the shear rate (expressed in s −1). Surface tension σ … rainer kauneWebApr 28, 2010 · The Cox-Merz Rule Rules. I've always viewed the Cox-Merz Rule as my savior, despite it being difficult to roll off the lips smoothly. A workhorse test in rheology is … rainer kautz