76 / 2020-09-25 14:42:42

Molecular dynamics simulation of ceramic polyolefin for fire resistant cable

Fire resistant cable; Ceramic polyolefin; Molecular dynamics simulation; Material selection.

In order to study the mechanism of high temperature environment’s influence on the mechanical properties and interparticle interactions of ceramic polymer materials for fire-resistant cables, the equivalent models of three ceramic polyolefin formulations were established according to the distribution proportion of each material. With the assistance of molecular simulation software, molecular dynamics simulation was carried out from the microcosmic point of view. The results show that with the increase of temperature, the intermolecular interaction weakens, the bulk modulus decreases, the shear modulus decreases, and the fractional free volume increases. The formulation with the most significant intermolecular interaction at high temperature, the formulation with the largest mechanical modulus at the same temperature and the formulation with the slowest increase of fractional free volume with temperature’s increase is the mixture system of ceramic ethylene butene copolymer and 28% EVA. The simulation results can provide reference for the selection of polyolefin ceramic materials for fire resistant cables.