Rubber Physics & its thermodynamics — Winter 2022

Derive the formula for entropy change of an ideal gas.

Brief out the given terms: - (1) Energy (2) Enthalpy (3) Entropy.

Outline First and Second law of Thermodynamics with suitable example.

Explain in detail about factors affecting Heat of Polymerisation.

Write down any three limitations of first law of thermodynamics.

What are the factors responsible for spontaneity of a reaction? Explain it.

Write a note on Ceiling temperature.

Derive the Flory–Huggins Equation with respect to Entropy of mixing.

Explain the effect of cross linking on solubility.

Derive the Scott’s Equation with respect to Three component systems.

Discuss in detail about the characteristic properties of rubber.

Explain the configuration of molecules with respect to polymer chain flexibility.

Discuss in detail about the conditions necessary for rubber like elasticity in polymers.

Brief out N-Class rubber and Q-class rubber respectively with their structure.

Give classification of polymer based on its origin with suitable examples.

Describe the salient features of Emulsion Polymerization technique.

Give classification of polymer based on its application with suitable examples.

Define the term ‘shape factor’. Also give it’s practical significance. Give formula to calculate the shape factor for rectangular and cylindrical rubber test specimen.

Describe the salient features of Suspension Polymerization technique.

With schematic diagram, state Archimedes principle of floatation for solid body (Rubber).

How surface Tension determination is carried out by Lectone du Nouy tensiometer?

Give the name of method used to determine the viscosity of polymer solution and discuss it in detail.

With schematic diagram, state laws of regular reflection.

Brief out the given terms:(1) Number Average Molecular Weight(2) Weight Average Molecular Weight

Discuss in detail about different types of friction observed in rubber.