Abstract
It is well known that nylon 6 possesses water absorbability and hygroscopicity, affecting their mechanical properties such as Young's modulus and yield strength. This study aims to investigate the effect of water content on the mechanical property of nylon6 using experiment and molecular dynamics (MD) simulation. First, uni-axial loading and micro indentation test were conducted against nylon sample having different water contents. Here, the water content was changed by heat aging and then we evaluated Young’s modulus and yield strength as a function of water contents. It is found that their mechanical properties strongly change, dependent on the water content. Next, to elucidate the deformation mechanism of nylon 6, molecular dynamics (MD) simulation was conducted. We constructed MD simulation cell for semi-crystalline structure of nylon 6 and water molecular was inserted in the simulation cell. Two models (with and without water content) were constructed, and mechanical loading was applied to this cell. We discussed the deformation mechanism of nylon 6, which is influenced by water content.
