Abstract
Experimental data are reported on moisture diffusion and the elastoplastic response
in uniaxial tensile tests of an intercalated nanocomposite with vinyl ester
resin matrix and montmorillonite clay filler at room temperature. Observations in
diffusion tests show that the moisture transport in the neat resin is Fickian, whereas
it becomes noticeably anomalous (non-Fickian) with the growth of the clay content.
This transition is attributed to immobilization of water molecules on surfaces of hydrophilic
clay layers. Experimental data in mechanical tests demonstrate that the
response of vinyl ester resin is strongly elastoplastic, whereas an increase in the clay
content reduces plastic strains. This result 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 anomalous moisture diffusion
through a nanocomposite and for its elastoplastic behavior. 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.
in uniaxial tensile tests of an intercalated nanocomposite with vinyl ester
resin matrix and montmorillonite clay filler at room temperature. Observations in
diffusion tests show that the moisture transport in the neat resin is Fickian, whereas
it becomes noticeably anomalous (non-Fickian) with the growth of the clay content.
This transition is attributed to immobilization of water molecules on surfaces of hydrophilic
clay layers. Experimental data in mechanical tests demonstrate that the
response of vinyl ester resin is strongly elastoplastic, whereas an increase in the clay
content reduces plastic strains. This result 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 anomalous moisture diffusion
through a nanocomposite and for its elastoplastic behavior. 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.
Original language | English |
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Number of pages | 29 |
Publication status | Published - 2002 |
Keywords
- anomalousdiffusion
- elastoplasticity
- nanocomposite