Download GTU BE/B.Tech 2018 Winter 3rd Sem New 2132301 Introduction To Plastic Material Science Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-III (New) EXAMINATION — WINTER 2018
Subject Code: 2132301 Date: 28/11/2018
Subject Name: Introduction to Plastic Material Science
Time: 10:30 AM TO 01:00 PM Total Marks: 70

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Instructions:

1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

MARKS

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Q.1 (a) Draw the structures of 1) PMMA ii) Polystyrene iii) Polyvinyl alcohol. 03
(b) Differentiate between Addition and Condensation Polymerisation. 04
(c) Give detailed classification of polymers giving suitable examples. 07

Q.2 (a) Define giving examples 1) Monomer ii) Polymer iii) Polymerisation 03
(b) Give the functionality of the following i) CH3COOH ii) CH3NCO iii) HOCH2CH2OH iv) HON CH2(CH2)sCH2NH 04

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(c) Write a short note on Free Radical Polymerisation. 07

OR

(c) Explain coordination Polymerisation technique. 07

Q.3 (a) Define Initiators. List any three initiators used for free radical polymerization. 03
(b) What is the molecular weight of PE if the no. of repeating units is 1200? 04

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(c) Differentiate (low molecular weight compounds and polymers. 07

OR

Q.3 (a) Explain briefly spherulites. 03
(b) Write a short note on Inhibitors. 04
(c) Explain linear, branched and cross linked polymer with suitable example 07

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Q.4 (a) Explain the relation between Tg & molecular weight. 03
(b) Explain Suspension polymerization technique. 04
(c) Write a brief note on functionality of polymers. Explain giving examples. 07

OR

Q.4 (a) What is tacticity in polymers? Explain briefly. 03

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(b) Explain giving examples the Acidolysis and Aminolysis reactions. 04
(c) Explain factors affecting crystallisability in polymers. 07

Q.5 (a) Discuss Polycondensation reaction of ethylene glycol and adipic acid to form polyesters. 03
(b) Explain the bulk polymerization technique with its advantages & disadvantages 04

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(c) Define: Glass transition temperature. Explain factors influencing the Glass transition temperature with suitable examples. 07

OR

Q.5 (a) Explain Geometric Isomerism in polymers. 03

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(b) Explain the relationship between Tg and Plasticisers. 04
(c) Differentiate between crystalline and amorphous polymers. 07