Results 181 to 190 of about 1,300,474 (200)

Note on the use of the Avrami equation for the interpretation of the primary crystallization of polymers

European Polymer Journal, 1968
Abstract The influence of volume changes and the influence of the start of the phase transition on the values of the rate constant and exponent in the Avrami equation for isothermal polymer crystallization are discussed. It is shown that shifting the start of phase transition, expressed as a percentage of the crystallization half-life, roughly ...
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Modified avrami equation for the bulk crystallization kinetics of spherulitic polymers

Journal of Polymer Science Part A: General Papers, 1965
AbstractAn explanation of the anomalous fractional values of the Avrami exponent found for the crystallization of a number of polymers is presented. The interpretation is based on a model which postulates the constant radial growth of spherulites, followed by an increase in crystallinity within them by a first order process.
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Comparing the Johnson–Mehl–Avrami–Kolmogorov equations for isothermal and linear heating conditions

Thermochimica Acta, 2001
Abstract We present a derivation of the linear heating Johnson–Mehl–Avrami–Kolmogorov (JMAK) equation for a constant nucleation rate and diffusion-controlled growth, in the hard impingement approximation. The result is compared with the linear heating JMAK equation for interface-controlled growth, and with the isothermal JMAK equation.
G. Ruitenberg, E. Woldt, A.K. Petford-Long   +2 more
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Testing Method for the Johnson–Mehl–Avrami Equation in Kinetic Analysis of Crystallization Processes

Journal of the American Ceramic Society, 2000
The kinetics of crystallization processes in solids are usually described by the Johnson–Mehl–Avrami equation. One of the most popular methods to test the applicability of this equation is based on a double logarithmic plot of fraction crystallized (α).
Jiří Málek, Takefumi Mitsuhashi
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A Generalized Avrami Equation for Crystallization Kinetics of Polymers with Concomitant Double Crystallization Processes

Crystal Growth & Design, 2017
Concomitant double crystallization processes widely occur in semicrystalline polymers and their blends because of structural and morphological heterogeneity. In this work, a generalized kinetics model was established for the isothermal crystallization in the presence of concomitant double crystallization processes, based on the Avrami theory for single
Rui-Yang Wang, Shu-Fen Zou, Bai-Yu Jiang, Bin Fan, Meng-Fei Hou, Biao Zuo, Xin-Ping Wang, Jun-Ting Xu, Zhi-Qiang Fan   +8 more
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On the application of the Avrami-Erofeev equation in non-isothermal reaction kinetics

Thermochimica Acta, 1986
Abstract Generalization of the Avrami-Erofeev equation to non-isothermal solid-state reaction kinetics has been discussed. The derivation of an alternative form of this equation to be used in non-isothermal analyses has been given.
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A comment on an application of the Avrami Equation to Electrocrystallisation

Journal of Electroanalytical Chemistry, 1979
R.D. Armstrong, A. Bewick, M. Fleischmann   +2 more
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Application of Kolmogorov–Johnson–Mehl–Avrami equations to non-isothermal conditions

Computational Materials Science, 2010
Abstract A temperature domain form of the standard Kolmogorov–Johnson–Mehl–Avrami (KJMA) equation is presented which can be used simulate phenomena such as phase transformation and recrystallization kinetics under non-isothermal conditions. This form of the KJMA equation relies on a parameterized temperature–time history based on either a quadratic ...
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Nonisothermal Crystallization Kinetics: Studying the Validity of Different Johnson–Mehl–Avrami–Erofeev–Kolmogorov (JMAEK) Based Equations

Thermochimica Acta, 2021
Dimitra Kourtidou, Konstantinos Chrissafis   +1 more
exaly  

Constrained and unconstrained growth : applying the Avrami Equation to the production of materials

2013
Production of materials which are limited by the amount available on the earth's surface follow a growth curve similar to the Avrami equation which governs the process of nucleation and growth. This thesis will analyze whether the product curve follows not only the same path but the same steps as the Avrami model: initially slow growth during an ...
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