GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- III (New) EXAMINATION — WINTER 2019
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Subject Code: 2132602 Date: 03/12/2019Subject 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) Give the natural sources of cellulose and draw the chemical structure of 03 the same.
(b) Write in brief about Lignin and Coal as natural polymers. 04
(c) Explain the seed propagation method for Hevea tree with the help of 07 schematic diagram.
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Q.2 (a) What do you mean by Wet stretching? 03
(b) Discuss about axes of orientation. 04
(c) Explain the importance of Carbon element in Polymer chemistry. 07
OR
(c) Explain in detail about the effect of ‘impurities remain from the original 07 polymerization reaction’ on properties and applications of final polymer.
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Q.3 (a) How Porous structure of Polymers can be obtained by using Solvent? 03
(b) Describe the mechanism of sorption of inert sorbates on polymers 04
(c) List the methods for manufacturing of Styrene monomer and explain any 07 one with reaction mechanism.
OR
Q.3 (a) How the Porosity can be introduced in polymers by using Porophores? 03
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(b) Give difference between Sorption and Adsorption. 04(c) List the ways for production of Butadiene monomer and explain any one 07 with reaction mechanism.
Q.4 (a) Define the term ‘Homopolymers’ and ‘Copolymers’ with suitable example. 03
(b) Describe linear, branched and cross-linked polymers. 04
(c) Explain in detail about Mechanical degradation of polymer. 07
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ORQ.4 (a) Write about Organic and Inorganic polymers. 03
(b) Draw the schematic representation of different types of copolymer 04 structures.
(c) List the basic mechanism of Polymer degradation. Explain about any one. 07
Q.5 (a) Which are the different ways to apply alkyd resins in surface coatings? 03
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(b) Write the important stages involved in synthesis of Phenolic resins. 04(c) Discuss about the factors influencing the glass transition temperature (Tg). 07
OR
Q.5 (a) Describe the properties and uses of rigid foam. 03
(b) Compare Amino resins and Phenolic resins. 04
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(c) Write a short note on thermal transitions in polymers. 07--- Content provided by FirstRanker.com ---
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