Download GTU BE/B.Tech 2019 Winter 3rd Sem New 3132301 Plastics Material Science Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 3rd Sem New 3132301 Plastics Material Science Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

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:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. 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 i) 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 i) C6H5COOH ii)
OHCH2CH2OH iii) NH2(CH2)6NH2
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, 1x10
5
,
2x10
5
& 3x10
5
. 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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