Download GTU BE/B.Tech 2018 Winter 5th Sem New 2153606 Question Paper

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Subject Code: 2153606

GUJARAT TECHNOLOGICAL UNIVERSITY

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BE - SEMESTER-V (NEW) EXAMINATION - WINTER 2018

Subject Name: Polymer & Rubber Material-II

Time: 10:30 AM TO 01:00 PM

Instructions:

1. Attempt all questions.

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

1. 1. Draw The Structure of Epoxy, MF, UF
   2. Name the polymer with structure for following applications and give reason for choice: mold release agent & mattress
   3. Explain in detail synthesis and applications of Amino resin.

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   MARKS

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2. 1. Write a Application of Epoxy Resin in Coating Industry.
   2. Describe the Application & Properties of Novolac Resin
   3. Explain the reaction mechanism between phenol and formaldehyde and process of forming PF resins

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3. 1. Why curing is important in case of thermosets? Discuss briefly the mechanism of curing of epoxy system with various curing agents
   2. Compare sulfur vulcanization vs peroxide vulcanization.
   3. Write an explanatory note on epoxy-novalac & epoxy-acrylate system.

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   07

4. 1. Explain in short the vulcanization of rubber and also the cross linking technology.

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5. 1. Give the Name of Modified alkyds
   2. Write Application of UF & MF
   3. Thermoset polymers are very ‘useful in the coating application. Name a thermoset polymer used for this purpose in washing machine application. Justify and describe the synthesis and properties of the polymer

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6. 1. Define 1) Acid Value ii) lodine Value iii) Epoxy Equivalent Weight

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   2. Write an explanatory note on epoxy-novalac & epoxy-acrylate system.
   3. Describe the synthesis, curing and applications of polyurethane resins

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7. 1. Write unique properties polyurethane resins.
   2. Explain silicones rubber? Mention its important application
   3. Illustrate with example vulcanization & de-vulcanization of rubbers.

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8. 1. What is fiber reinforced polyester?
   2. Justify: Why Thermosetting Polymers are Amorphous?

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   3. Explain the reaction mechanism between phenol and formaldehyde and process of forming PF resins?

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9. 1. Explain CNSL Resin
   2. Write application & Properties of Kevlar Fiber
   3. Write a short note on alkyd resin. Explain with types.

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   07

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Date: 04/12/2018

Total Marks: 70

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