Subject Code:3152608
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE- SEMESTER-V (NEW) EXAMINATION — WINTER 2020
Subject Name:Synthetic Rubbers
Time:10:30 AM TO 12:30 PM
Instructions:
- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1
- Mention the basic microstructures of Polybutadiene Rubber (PBR) with their structures. (03)
- Draw the flow diagram for solution polymerization of Polybutadiene rubber (PBR). (04)
- List the basic grades of Isoprene Rubber (IR). Explain the synthesis of any one in detail. (07)
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Q.2
- Which properties of Polychloroprene rubber get affected by polymerization temperature? Mention in brief. (03)
- Write the commercially available types of Polychloroprene rubber with their characteristics. (04)
- Discuss about the effect of monomer ratio on various properties for Ethylene Propylene Diene Methylene Rubber (EPDM). (07)
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Q.3
- Why Butyl rubber has an excellent Air impermeability property? Give reason. (03)
- Write the available types of Halogenated Butyl rubber and write about its synthesis. (04)
- List out the possible curing systems for Butyl rubber. Explain about any one in detail. (07)
Q.4
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- Give the abbreviation for Butyl rubber and also mention its important properties and applications. (03)
- Write about the advantages of Halogenated Butyl rubber over Conventional Butyl rubber. (04)
- Draw the flow diagram for synthesis of Butyl rubber and explain in detail. (07)
Q.5
- Mention the reaction mechanism for synthesis of Styrene Butadiene Rubber. (03)
- Give differences between E-SBR and S-SBR. (04)
- Discuss about the significance of monomer ratio on properties of Acrylonitrile Butadiene Rubber. (07)
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Q.6
- Write about the advantages and disadvantages of Carbon Black Master Batch SBR (CBMBSBR). (03)
- What do you mean by Cold SBR? How it is advantageous over Hot SBR? (04)
- Name the polymerization method used for large scale production of Acrylonitrile Butadiene Rubber. Explain it in detail. (07)
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Q.7
- What is RTV in Silicone rubber? Write in short. (03)
- Explain the methods for reinforcing High Strength Rubber. (06)
- Write a detailed note on Liquid Silicone Rubber. (07)
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Q.8
- Give the classification of Silicone rubber based on side group substituent. (03)
- List the techniques to carry out blending of Elastomers. (04)
- Describe in detail about Extrusion of Silicone Elastomers. (07)
Date:29/01/2021
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Total Marks: 56
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