Eyring equation


Also found in: Wikipedia.

Eyring equation

[′ī·riŋ i‚kwā·zhən]
(physical chemistry)
An equation, based on statistical mechanics, which gives the specific reaction rate for a chemical reaction in terms of the heat of activation, entropy of activation, the temperature, and various constants.
References in periodicals archive ?
The craze growth rates were found to exponentially increase with an increase in stress, obeying the Eyring equation for thermally activated processes In the presence of an applied stress.
The Eyring equation describes the strain rate in the direction of the applied stress in a thermally activated deformation process.
The Eyring equation for yield stress shown in Eq 5 will now be fit to the experimental data of Fig.
NOMENCLATURE A Pre-exponential factor in Eyring equation a Cross-sectional area D Pure stretch tensor [DELTA] D Stretch increment tensor [e.
A Abrasion Non-resistance Copolymerization B Back-Flow Butyl Rubber C Calcium Carbonate (CaCO3)Cyanate Ester D DABCO Dynamic Vulcanization E Effective Modulus Eyring Equation F Fabrication Fusion Promoter G Gate Gutta Percha H Halogenated Fire Retardant Hyperbranched Polymer I Impact ModifierIzod Impact Test J J integral Joint K K Value Kneading L Lamella L?
The plastic deformation of a polymer has been considered to be a thermally activated process involving inter-and intramolecular motion and has been described by Eyring equation (17) as follows:
The Eyring equation has been shown to be valid at high strain rates by many workers (e.
The Eyring equation has been introduced, in the earlier treatments, assuming that the reactants are in equilibrium with the activated complexes, meaning that the activation energy (or the activation volume) is time independent, and so is the structure as well (5).
Beta]] close to those found by other authors or calculated from the Eyring equation, reinforcing the Bauwens approach (Table 2).
Thus, each material is initially reduced to a constitutive model of two Eyring equations, each having three parameters: an activation energy [DELTA]H, an activation volume V* and a reference strain rate [[epsilon].