Question

1) How do temperature and rate affect the yield strength of polymer nanocomposites? Is there a model that can be used to predict the affect of temperature and strain rate on the yield strength. Please describe this model.

Answer 1

Solution :

Both elastic modulus and yield strength decreased with increasing temperature, while the yield strain increased with increasing temperature in the temperature range of the polypropylene and polyamide-6 nanocomposites.

Eyring cooperative model

• It has a theoretical basis from chemistry and quantum mechanics.
• If a chemical process (chemical reaction, diffusion, corrosion, migration, etc.) is causing degradation leading to failure, the Eyring model describes how the rate of degradation varies with stress or, equivalently, how time to failure varies with stress.
• The model includes temperature and can be expanded to include other relevant stresses.
• The temperature term by itself is very similar to the Arrhenius empirical model, explaining why that model has been so successful in establishing the connection between the ΔH parameter and the quantum theory concept of "activation energy.

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