A model for anomalous moisture diffusion through a polymer-clay nanocomposite

TL;DR

This paper models anomalous moisture diffusion and elastoplastic response in a vinyl ester resin nanocomposite with clay filler, highlighting how clay content influences water transport and mechanical behavior, supported by experimental data and numerical simulations.

Contribution

It introduces constitutive equations for anomalous moisture diffusion and elastoplasticity in nanocomposites, validated by fitting experimental data and numerical simulations.

Findings

Water diffusion shifts from Fickian to anomalous with more clay.

Clay content reduces plastic strains and alters stress-strain behavior.

Numerical simulations closely match experimental observations.

Abstract

Experimental data are reported on moisture diffusion and the elastoplastic response of an intercalated nanocomposite with vinyl ester resin matrix and montmorillonite clay filler at room temperature. Observations in diffusion tests show that water transport in the neat resin is Fickian, whereas it becomes anomalous (non-Fickian) with the growth of the clay content. This transition is attributed to immobilization of penetrant molecules on the surfaces of hydrophilic clay layers. Observations in uniaxial tensile tests demonstrate that the response of vinyl ester resin is strongly elastoplastic, whereas an increase in the clay content results in a severe decrease of plastic strains observed as a noticeable reduction of curvatures of the stress--strain diagrams. This is explained by slowing down of molecular mobility in the host matrix driven by confinement of chains in galleries between platelets. Constitutive equations are developed for the anomalous moisture diffusion through and the elastoplastic behavior of a nanocomposite. Adjustable parameters in these relations are found by fitting the experimental data. Fair agreement is demonstrated between the observations and the results of numerical simulation. A striking similarity is revealed between changes in diffusivity, ultimate water uptake and the rate of plastic flow with an increase in the clay content.