Download GTU BE/B.Tech 2019 Summer 4th Sem New 2143602 Rubber Chemistry And Natural Polymers Question Paper

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1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

1. Draw the Structure of (a) Neoprene (b) SBR (c) IR MARKS 03
2. Write down brief chemistry of Natural Rubber. MARKS 04
3. Explain in detail about production of Butyl Rubber MARKS 07

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1. What are the % composition of latex? MARKS 03
2. How to synthesize polyisoprene. MARKS 04
3. Briefly explain about production of NBR with neat flow diagram. MARKS 07
   OR
   Explain in detail about Epoxy resin. MARKS 07

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1. Draw structure of (a) Bis-phenol A (b) Poly Acrylonitrile MARKS 03
2. Write a short note on EPDM. MARKS 04
3. What do you mean by vulcanization? Explain Sulphur vulcanization in detail. MARKS 07
   OR
   Write down different properties of Neoprene: MARKS 07

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1. How to coagulate polychloroprene latex: MARKS 03
2. Explain in brief about different ‘elastomeric materials used in industries. MARKS 04
3. Explain how Proteins are classified under natural polymer via its chemistry. MARKS 07

1. Explain Chemistry of Chitin and Chitosan. MARKS 03
2. Write a short note on ‘modification of natural polymers and rubber. MARKS 04
   

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   OR
   What are the different factors to be consider while selecting Polyols? MARKS 07

1. How Poly lactic acid (PLA) is synthesized? MARKS 03
2. Explain in detail about production of Acrylonitrile monomer. MARKS 04
3. What do you mean by Forming process in rubber vulcanization? MARKS 07

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1. What are the different ingredients used for NBR polymerization. MARKS 03
2. Explain different types of Polyols with its properties and structure. MARKS 04
   OR
   Explain in brief about Chemistry of Starch and lignin. MARKS 07

1. Explain Process of Polyurethane Adhesives. MARKS 03

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2. Explain in detail about Mechanism of Crosslinking in rubber vulcanization. MARKS 04