GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-III (NEW) EXAMINATION — SUMMER 2019
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Subject Code: 2132602 Date: 11/06/2019
Subject Name: Rubber Technology
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Draw the chemical structure of starch and give its natural sources. [03]
(b) Write in brief about ‘Lignin’ and ‘Humus’. [04]
(c) Draw the principal regions of mature trunk of the Hevea brasiliensis tree and explain it in detail. [07]
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Q.2 (a) Write about warm stretching. [03]
(b) What is the relation between orientation and crystallization? Describe it in brief. [04]
(c) Explain in detail about the effect of ‘impurities remain from the original polymerization reaction’ on properties and applications of final polymer. [07]
OR
(c) Discuss in detail about the importance of Hydrogen element in polymer chemistry. [07]
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Q.3 (a) Write about Homochain and Heterochain polymers. [03]
(b) Draw the schematic representation of different types of copolymer structures. [04]
(c) Discuss about the factors influencing the glass transition temperature (Tg). [07]
OR
(a) Define the term ‘Organic polymer’ and ‘Inorganic polymers’ with suitable example. [03]
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(b) Describe linear, branched and cross-linked polymers. [04](c) Write a short note on thermal transitions in polymers. [07]
Q.4 (a) Differentiate the terms ‘sorbate’ and ‘sorbent’. [03]
(b) Describe any two methods of forming porous structure of polymers. [04]
(c) List the processes to produce butadiene monomer and explain any one in detail. [07]
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OR(a) What do you mean by porosity in polymers? Write about the method of its estimation. [03]
(b) Describe the mechanism of sorption of inert sorbates on polymers. [04]
(c) Explain in detail about production of styrene by dehydrogenation of ethylbenzene. [07]
Q.5 (a) Describe the properties and uses of rigid foam. [03]
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(b) Write about different applications of amino resins. [04](c) Write a short note on oxidative degradation of polymers. [07]
OR
(a) Which are the different ways to apply alkyd resins in surface coatings? [03]
(b) Discuss about the properties and uses of unsaturated polyester resins. [04]
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(c) Explain in detail about the types of polymer degradation with their characteristics. [07]--- Content provided by FirstRanker.com ---
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