Download GTU BE/B.Tech 2017 Winter 3rd Sem Old 132301 Introduction To Plastic Material Science Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2017 Winter 3rd Sem Old 132301 Introduction To Plastic Material Science Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?III (OLD) EXAMINATION ? WINTER 2017
Subject Code:132301 Date:17/11/2017

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.

Q.1 (a) Discuss How polymers and low molecular weight compounds are differing
from each other?
07
(b) List various steps of free radical polymerisation and explain each with suitable
example.
07



Q.2 (a) Define polymers. Give detail classification of polymers with suitable
examples.
07
(b) What are chain and step polymerization? Give difference between them. 07
OR
(b) Give difference between thermoplastic and thermosetting plastics. 07

Q.3 (a) Explain Polydispersity & Molecular weight distribution in polymers. 07
(b) What is Glass transition temperature? Discuss various factors affecting Tg. 07
OR
Q.3 (a) Explain number average and weight average molecular weight in polymers. 07
(b) Explain bulk polymerization technique along with advantages, disadvantages
and applications.
07

Q.4 (a) Explain optical isomerism by suitable examples. 07
(b) Discuss various factors affecting crystallisability. 07
OR
Q.4 (a) What do you mean by Polydispersity? Explain Polydispersity & Molecular
weight distribution in polymers.
07
(b) Answer the following:
i) Write a note on : Tacticity
ii) Calculate the contour length and the extended chain length of PE
Mol. Given: - n =6000 , Bond angle-109?28' ,Segment length -1.54 ?.
07

Q.5 (a) Explain Emulsion polymerization in detail. 07
(b) Define: Co-polymer, Initiator, Cross-linked polymer, Graft copolymer, Degree
of polymerisation, Inhibitor, Block copolymer
07
OR
Q.5 (a) Explain solution polymerization technique. 07
(b) Give difference between suspension and emulsion polymerization. 07
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