Molecular Dynamics Study for the Temperature & Moisture Effect on Mechanical Property and Thermal Stability of PMIA Insulation Paper

Abstract

This paper aims to study the temperature and moisture effect on the poly-m-phenylene isophthalamide (PMIA) mechanical property and thermal stability by adopting molecular dynamics method (MD). The study shows that as the temperature increases, the PMIA rigidity weakens, and the plasticity and ductility are increased; also, the mean square displacement (MSD) and gyration radius of PMIA increases with temperature increasing, and the chain motion of PMIA is intensified, i.e. thermal stability drops. As the moisture content increases, the PMIA rigidity weakens, and the plasticity and ductility are increased with the moisture content; compared with the situation in the lower water content (<2%) and higher water content (4% and 5%), the chain motion of complex model is more intensified, indicating that the PMIA thermal stability gradually decreases with the water content increasing.