GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
Envlmnt No.
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER- III (New) EXAMINATION — WINTER 2019
Subject Code: 3132301 Date: 28/11/2019
Subject Name: Plastics Material Science
Time: 02:30 PM TO 05:00 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) Draw the structures of i)PMMA ii) PVC iii)PS | 03 |
| (b) Explain thermoplastics & thermosets giving examples. | 04 |
| (c) Differentiate between polymers & low molecular weight compounds. | 07 |
| Q.2 (a) What are natural polymers? Give examples. | 03 |
| (b) Define 1) Monomer ii) Polymer iii) Inhibitor iv) Glass Transition Temperature | 04 |
| (c) Differentiate between chain and step polymerization. | 07 |
| OR | |
| (c) Write a short note on initiators used in free radical polymerization. | 07 |
| Q.3 (a) What is the molecular weight of PP if the no. of repeating units is 1500. | 03 |
| (b) Explain the bulk polymerization technique. | 04 |
| (c) Which are the types of Addition Polymerisation? Explain free radical polymerization in detail. | 07 |
| OR | |
| Q.3 (a) Discuss about practical significance of polymer molecular weight. | 03 |
| (b) Explain about homopolymers and copolymers giving examples. | 04 |
| (c) What is isomerism? Explain about stereoregular polymers. | 07 |
| Q.4 (a) Write a short note on‘hydrolysis & aminolysis reactions. | 03 |
| (b) Explain the suspension polymerization technique. | 04 |
| (c) Give the detailed classification of polymers. | 07 |
| OR | |
| Q.4 (a) State the functional groups and functionality of 1) C6H5COOH ii) OHCH2CH2OH iii) NH2(CH2)5NH2 | 03 |
| (b) Explain condensation polymerization with examples. | 04 |
| (c) What is polydispersity? Explain polydispersity and molecular weight distribution in polymers. | 07 |
| Q.5 (a) Calculate Mn(Number Average molecular weight) of a polymer consisting of three fractions with molecular weights, 1x104, 2x105 & 3x106. The mole fractions are found to be 0.1, 0.5 & 0.4 respectively. | 03 |
| (b) Briefly explain about Plastics, Elastomers, Fibers & Liquids. | 04 |
| (c) Explain the factors affecting Tg of a polymer. | 07 |
| OR | |
| Q.5 (a) Explain chain termination by chain transfer reaction. | 03 |
| (b) Differentiate between crystalline & amorphous polymers. | 04 |
| (c) Explain the factors affecting crystallinity of a polymer. | 07 |
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