Seat No.: Enrolment No.
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER-III (New) EXAMINATION — WINTER 2018
Subject Code: 2133602 Date: 28/11/2018
Subject Name: Polymer Chemistry (Elective-I)
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
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- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
MARKS
Q.1 (a) What makes polymer different from other material? 03
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(b) Elaborate the applications of polymers. 04
(c) Draw the chemical structure of following: i. Styrene ii. Vinyl 07 Chloride iii. Bakelite iv. Ethylene v. Butadiene vi. Urea vii. lactic acid.
Q.2 (a) What is glass transition temperature? 03
(b) Write a short note on molecular weight distribution. 04
(c) Explain solution and bulk polymerization in detail. 07
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OR
(c) Explain emulsion and suspension polymerization in detail. 07
Q.3 (a) Explain in detail degree of polymerization. 03
(b) Explain with example ionic and copolymerization. 04
(c) Elaborate LCST & UCST. 07
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OR
Q.3 (a) Draw the structure of polycaprolactum, terephthalic acid, phenol 03 formaldehyde resin
(b) Differentiate between thermoplastics and thermoset polymer 04
(c) Explain crude oil distillation in detail. 07
Q.4 (a) Explain free radical kinetics. 03
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(b) Explain how Mn and Mw are determined. 04
(c) Explain synthesis of caprolatum and butadiene 07
OR
Q.4 (a) What are the different engineering problems associated with bulk 03 and solution polymerization?
(b) Write a note on Gel Permeation Chromatography. 04
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(c) Explain the synthesis of urea and melamine. 07
Q.5 (a) What are the different ways of expressing molecular weight of a 03 polymer? Give the formulas for expressing them.
(b) What are the different methods to determine the crystallinity in 04 polymers?
(c) Derive an expression for the rates of all the reactions involved in 07 anionic polymerization. Also derive expressions for degree of polymerization in anionic polymerization
OR
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Q.5 (a) Elaborate the end uses of polymers. 03
(b) Explain addition and condensation polymerization. 04
(c) Derive an expression for the rates of all the reactions involved in 07 cationic polymerization. Also derive expressions for degree of polymerization in cationic polymerization
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