Rubber Technology — Winter 2018

Which are the different sources of natural rubber?

Write in brief about Lignin as a natural polymer.

Explain the bud-grafting process for vegetative propagation of Hevea brasiliensis.

What do you mean by Warm Stretching? Explain in brief.

How the applied orientation affects the tensile strength and elongation properties?

Discuss about the importance of Hydrogen element in organic chemistry and in polymer structure.

Write in detail about the effect of impurities remaining from the original polymerisation reaction on final polymer composition.

What is the difference between linear and branched polymers?

Write about the different configurations of butadiene units in polybutadiene molecule.

Discuss in detail about thermal transitions in polymers.

What do you mean by ‘Organic polymers’ and ‘Inorganic polymers’?

Give the difference between Homopolymers and Copolymers with suitable example.

Discuss in detail about the factors influencing the Glass transition temperature.

Give difference between absorption and adsorption.

Write about any two methods of forming porous structure of polymer.

List the processes for production of chloroprene monomer. Explain any one in detail.

Define the terms: (i)Sorption (ii)Sorbent (iii)Sorbate

Write about the mechanism of sorption of inert sorbates on micropore and macropore respectively.

Discuss about the Reppe process for the production of butadiene monomer.

Write about the properties of unsaturated polyester resins.

Write in brief about the different types of polyurethane foams.

Discuss about the different factors affecting thermal stability of a polymer.

Write the major applications of amino resins.

Give the properties and uses of Silicone fluids and Silicone Resins.

Which are the types of degradation? Discuss in detail about the same.