french version

Molecular dynamic

Equipe de recherche : Duffour E.
Collaboration : Malfreyt P.
Laboratoire de Thermodynamique des solutions et des polymères (LTSP) - 24, avenue des landais - 63177 AUBIERE Cedex France

The interaction between plasma and a polymer is accompanied by a significant loss of mass of the insulating material, as well as by energy and chemical transfers between the wall and ionized hot gas. The understanding of the elementary physical phenomenon is the most important technological bolt in terms of control and development of the industrial equipment compelled to this interaction.

With the intention of bringing elements of answers, a theoretical study, based on the resolution of Hamilton's equations, at the microscopic scale, is accomplished in the laboratory. From a molecular model of the polyethylene, a macromolecule with the following chemical formula (CH2)n, some different interactions are studied :

complete model of the polyethylene crystal.

Figure 1. Complete model of the polyethylene crystal.

polyethylene crystal, SF6 molecule and copper ions interaction.

Figure 2. Polyethylene crystal, SF6 molecule and copper ions interaction.

 

The last evolutions of the model are :

Interaction Polyethylene crystal- copper ions Cu+

time evolution of the polyethylene's crystal temperature.

Figure 3. Time evolution of the polyethylene's crystal temperature.

time evolution of the different kinds of kinetic and potential energies of the polyethylene crystal. The average velocity of the incident particles is 7 km.s<sup>-1</sup>.

Figure 4. Time evolution of the different kinds of kinetic and potential energies of the polyethylene crystal. The average velocity of the incident particles is 7 km.s-1.

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