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Gujarat Technological University

This document contains a test for an Introduction to Plastic Material Science course. The test has 5 questions covering key concepts in polymers such as: 1. Definitions of initiators, natural polymers, polymerization techniques, molecular weight, glass transition temperature, and types of polymers. 2. Explanations of homopolymers, thermoplastic polymers, chain and step polymerization, chain termination reactions, and classifications of plastics. 3. Descriptions of the differences between low molecular weight compounds and polymers, crystalline and amorphous polymers, and the effect of functionality on polymer structure.

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74 views2 pages

Gujarat Technological University

This document contains a test for an Introduction to Plastic Material Science course. The test has 5 questions covering key concepts in polymers such as: 1. Definitions of initiators, natural polymers, polymerization techniques, molecular weight, glass transition temperature, and types of polymers. 2. Explanations of homopolymers, thermoplastic polymers, chain and step polymerization, chain termination reactions, and classifications of plastics. 3. Descriptions of the differences between low molecular weight compounds and polymers, crystalline and amorphous polymers, and the effect of functionality on polymer structure.

Uploaded by

Jainesh
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Seat No.: ________ Enrolment No.

___________

GUJARAT TECHNOLOGICAL UNIVERSITY


BE - SEMESTER–III (NEW) - EXAMINATION – SUMMER 2017
Subject Code: 2132301 Date: 31/05/2017
Subject Name: Introduction to Plastic Material Science
Time: 10:30 AM to 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

MARKS
Q.1 Short Questions 14
1 Define initiators.
2 Draw the structure of Polystyrene and Polyvinyl chloride.
3 What are natural polymers? Give examples.
4 Write the full name of PP and PMMA.
5 Bulk polymerization technique gives us the purest form
of polymer ----True or False.
6 ___________ polymerization is also called Pearl
polymerization.
7 Define Inhibitors.
8 List the three steps of chain polymerization process.
9 What is the molecular weight of PP if the no. of repeating
units is 1500.
10 Define hetero chain polymer. Give example
11 Give on example of organic polymer and inorganic
polymer.
12 Give the schematic representation of random and graft
copolymers.
13 State the functional group and functionality of
C6H5COOH.
14 Define Glass Transition Temperature.
Q.2 (a) Define homopolymers. Give at least two examples of it. 03
(b) What are thermoplastic polymers. Explain briefly giving 04
examples.
(c) Differentiate chain polymerization and step 07
polymerization.
OR
(c) Write a short note on initiators used in free radical 07
polymerization.
Q.3 (a) Explain the chain termination by chain transfer reaction. 03
(b) Explain briefly Plastics, Elastomers, Fibres & Liquid 04
Resins.
(c) Write points of difference between low molecular weight 07
compounds and polymers.
OR
Q.3 (a) Define thermoset plastics. Give examples of thermoset 03
plastics.
(b) Differentiate between crystalline and amorphous 04
polymers.
1
(c) Explain the effect of functionality on structure of 07
polymers.
Q.4 (a) Explain homochain and heterochain polymers. 03
(b) Explain the bulk polymerization technique 04
(c) Explain free radical polymerization. 07
OR
Q.4 (a) Write short note on hydrolysis and aminolysis reactions. 03
(b) Explain the suspension polymerization technique. 04
(c) Write a short note on co-ordination polymerization. 07

Q.5 (a) Explain monodispersed and polydispersed system in 03


polymers.
(b) What is the importance of Tg and its relation to HDT 04
(c) Describe effect of structure on crystallisability of 07
polymers.
OR
Q.5 (a) What is the practical significance of polymer molecular 03
weight?
(b) Explain optical isomerism in stereo-regular polymers. 04
(c) Describe the factors influencing Tg of polymers. 07

*************

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