Experimental study demonstrates concurrent increases in stiffness and ductility in poly(amino ether)/organoclay nanocomposites, suggesting polymer chain confinement enhances toughness.
Dispersed polymer nanocomposites based on a poly(amino ether) resin and organically modified laminar clays were obtained. The chemical nature of the organic modifier of the clay and the processing temperature were first chosen using Young's modulus of the nanocomposites as a measure of the dispersion level. The Cloisite ® 20A organoclay and a processing temperature of 170°C were the fixed parameters. Additionally, the clay content of the nanocomposites was changed and their nanostructure and properties were measured. A significant increase in the modulus of elasticity (35% with 4.3% montmorillonite addition) was observed, together with an unusual increase in ductility. The ductility behavior is attributed to a high degree of confinement of polymer chains inside the silicate layers, and the modulus values are discussed taking into account not only the dispersion level, but also the length of the clay particles.
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Granado et al. (2014) studied this question.
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