Master of Science II (Chemistry)Examination: Oct Nov 2016
Semester III (New CBCS)
SLR No. Day
Date Time Subject Name Paper
No. Seat No.
SLR SD
-221
Monday
21/11/2016
02.30 PM
to
05.00 PM
Basic concept of
Polymerization
C
XI
Instructions: Answer any five questions.
All questions carry equal marks.
(Section-I) Q.1 is compulsory.
Attempt any twoquestions from Section II
Attempt any two questions from Section III
Use of log table and calculators in allowed.
Total Marks:70
SECTION I
Q.1 Answer the following: 14
What are the possible modes for generation of free radicals in 1,1disubstituted
olefin monomer?
What is radical scavenger? Give one example.
Match the following monomer and initiating system.
1. Sodium in Naphthalene a. vinyl chloride
2. Sulphuric acid b. acrylonitrile
3. Boron trifluride and water c. Isobutylene
4. Butyl lithium d. Methyl Methacrylate
e. Styrene
Classify the different types of co-polymers.
Show the ring opening polymerization of the Norbornene using Grubs
catalyst.
What is step growth polymer? Give on example of Polyamides.
Define the term Inhibitor.
SECTION II
Q.2 Explain generation of free radical from AIBN. Show by chemical equations
the four necessary and sufficient steps of the free radical chain polymerization
of styrene using AIBN Initiator.
07
Discuss the mechanism of ring opening polymerization of ε-carprolactum by
Cationic and hydrolytic polymerization.
07
Q.3 Derive the kinetic expression for polyesterification using external acid
Catalyst for an equimolar mixture of diol and diacid.
07
What is anionic chain polymerization? Describe the mechanism of group
transfer polymerization and explain the concept of Living polymers.
07
Page 1 of 2
Q.4 Derive an expression for terminal model of copolymerization of two
monomers M1 and M2.
07
Explain the terms retardation and autoacceleration. Show the mechanism of
chain polymerization.
07
SECTION -II
Q.5 Predict types of Polymerization the following monomers will undergo. Justify
your answer.
Vinyl chloride ii) Vinyl acetate iii) Isobutylene
iv) Styrene acrylonitrile
05
Derive kinetic expression for rate of polymerization by cationic chain
polymerization show chemical equation for polymerization of isobutylene
using BF3H2O Initiating system.
05
Predict the product in the following reactions. 04
Q.6 Explain alternatecopolymer. 05
Describe briefly molecular weight control in step-growth polymerization. 05
Show that rate of polymerization depends on the square root of initiator
concentration.
04
Q.7 Write a note on any three of the following: 14
Q-e scheme
SBR and SAN
ADMET
Heterogeneous polymerization (occlusion)
Radical Scavanger