Rubber Technology — Summer 2019

Draw the chemical structure of starch and give its natural sources.

Write in brief about ‘Lignin’ and ‘Humus’.

Draw the principal regions of mature trunk of the Hevea brasiliensis tree and explain it in detail.

Write about warm stretching.

What is the relation between orientation and crystallization? Describe it in brief.

Explain in detail about the effect of ‘impurities remain from the original polymerization reaction’ on properties and applications of final polymer.

Discuss in detail about the importance of Hydrogen element in polymer chemistry.

Write about Homochain and Heterochain polymers.

Draw the schematic representation of different types of copolymer structures.

Discuss about the factors influencing the glass transition temperature (T ). g

Define the term ‘Organic polymer’ and ‘Inorganic polymers’ with suitable example.

Describe linear, branched and cross-linked polymers.

Write a short note on thermal transitions in polymers.

Differentiate the terms ‘sorbate’ and ‘sorbent’.

Describe any two methods of forming porous structure of polymers.

List the processes to produce butadiene monomer and explain any one in detail.

What do you mean by porosity in polymers? Write about the method of its estimation.

Describe the mechanism of sorption of inert sorbates on polymers.

Explain in detail about production of styrene by dehydrogenation of ethylbeneze.

Describe the properties and uses of rigid foam.

Write about different applications of amino resins.

Write a short note on oxidative degradation of polymers.

Which are the different ways to apply alkyd resins in surface coatings?

Discuss about the properties and uses of unsaturated polyester resins.

Explain in detail about the types of polymer degradation with their characteristics.