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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:40 |
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Conference: Bucharest University Faculty of Physics 2015 Meeting
Section: Polymer Physics
Title:
A special case of the polymer crystallization process
Authors:
Emil BARNA(1), Catalin BERLIC(1), Valentin BARNA(1), Bogdan MANOLESCU(1)
Affiliation:
(1) University of Bucharest, Faculty of Physics, 405 Atomistilor, Magurele-Ilfov, 077125, Romania
E-mail
cberlic@hotmail.com
Keywords:
Johnson–Mehl–Avrami (JMA) equation, kinetics of crystallization, polymer, Monte Carlo simulation
Abstract:
Semi-crystalline polymers are one of the most widely used classes of materials. The mechanical, thermal, electrical and optical, properties are very much dependent upon level of crystallinity achieved by the material during crystallization. The phase transformations involving nucleation and growth of the crystalline polymers is described by the well-known Johnson–Mehl–Avrami (JMA) equation. This equation provides an expression for the volume fraction of material transformed as a function of time. Irrespective of the nucleation mechanism, in the mathematical expression of the JMA equation, the geometry of the space is comprised. We studied the influence of the space geometry on the growth of the crystalline domains by means of the Monte Carlo simulations. We obtained a very good agreement between the crystallization rate constant and the Avrami index predicted by theory of the sporadic and instantaneous nucleation and those obtained from simulations.
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