This download link is referred from the post: SGBAU B.Tech Last 10 Years 2010-2020 Question Papers || Sant Gadge Baba Amravati university
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B.Tech. Sixth Semester (Polymer (Plastics) Tech.) (CGS)
11127 : Elastomer Technology
P. Pages : 2 W-32
Time : Three Hours Max. Marks : 80
Notes:
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- All question carry marks as indicated.
- Answer three question from Section A and three question from Section B.
- Due credit will be given to neatness and adequate dimensions.
- Assume suitable data wherever necessary.
- Diagrams and chemical equations should be given wherever necessary.
- Illustrate your answer necessary with the help of neat sketches.
- Discuss the reaction, mechanism wherever necessary.
- Use of pen Blue/Black ink/refill only for writing the answer book.
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SECTION - A
- a) Explain the process of storage, hardening and crystallization of natural rubber. 7
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b) Discuss the mixing, forming and vulcanization manufacturing process sequence in rubber industry. 7OR
- a) Define the term elastomer. Discuss the collection of natural rubber and the properties of raw natural rubber. Also give the various applications of natural rubber. 7
b) Explain the mastication and compounding process for raw rubber. 7 - a) Define the term "Vulcanization of Rubber'. Discuss the different non-sulfur methods of rubber vulcanization. 7
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b) Discuss the various factors and conditions affecting rate of vulcanization. 6OR
- a) Discuss in detail the reaction mechanism of vulcanization of rubber. 6
b) Explain the characteristic properties, and application of oil extended rubber. 7 - What do you mean by retrading of tyre ? Discuss in detail the design aspects, consideration and design pattern for tyre retrading. 13
OR
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- Explain the processing, properties and applications of followings : 13
i) Nitrile Rubber
ii) SBR
P.T.O
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SECTION-B
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- a) What are the various types of filter and reinforcement for plastics ? Discuss the choice of filters and properties required for plastics compounding. 9
b) What are plasticizers ? Discuss the effect of addition of plasticizer on the properties of plastic materials. 5OR
- a) What do you mean by plastic additives ? Discuss the different types of additives and their role in polymer compounding. 9
b) What is the selection criteria of lubricants for plastics ? Give its various types with example. 5 - Explain the properties, application and selection criteria for the following additives by giving example of each : 13
i) U.V. Stabilizer
ii) Flame Retardant
iii) Toughening AgentOR
- Discuss the properties, application and selection criteria for the following additives by giving example of each - 13
i) Foaming Agents
ii) Antiozonants
iii) Antistatic Agent - a) Discuss in detail the preparation, properties and application of animal glue and fish glue. 7
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b) Explain the standard test method of Lap shear strength for determining the strength of adhesive. 6OR
- a) How will you classify the polymer adhesives ? Discuss in detail the structural requirement of polymers to act as a adhesive for various substrate. 7
b) Explain the preparation, properties and applications of any one commercial adhesive. 6
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This download link is referred from the post: SGBAU B.Tech Last 10 Years 2010-2020 Question Papers || Sant Gadge Baba Amravati university
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