![]() The hardness, elastic modulus and creep resistance of nylon 6 were improved in the nanocomposites across the temperature range. The nanomechanical properties of nylon 6, nylon 6/exfoliated clay and nylon 6/non-exfoliated clay nanocomposites have been investigated from room temperature to −10 ☌ in a controlled environment with humidity less than 1% RH. For D 9 5 nylon/EC-5, the creep depth was reduced over the range of 27 C to ¡10 C, which may imply that the shoulder of the b relaxation peak does not extend quite as far as ¡10 C in the nearD 9 6 -surface region of the exfoliated nanocomposite, which could be explained by the improved molecular-level constraints due to 235 the small size and high surface area of the clay platelets, together with the short inter-particle distance which prevents free D 9 7 rotation of the matrix molecular chains. LowD 9 3 -temperature DMA data on other nylon 6Àclay nano-230 composites reported in show that it is centred around ¡50 C and that tan dD 9 4 begins to rise again when the temperature decreases below ✱5 C. In principle, brittleness and crack propagation at lower temperature could result in enhanced time-dependent deformationD 9 1, but we consider it more likely that the slight increase in creep depth at ¡10 C on D 9 2 nylon 6 and non-exfoliated nanocomposite is a consequence of being on the shoulder of the b relaxation peak of nylon 6. Decreasing the temperature below T g reduces the free volume. ![]()
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