M.Sc. (Semester IV) (CBCS) Examination Mar/Apr-2018
Polymer Chemistry
STEREOREGULAR POLYMERS AND MODERN POLYMERISATION METHODS
Time: 2½ Hours
Max. Marks: 70
Instructions: Attempt five questions. All question carry equal marks. (Section Q.1 is compulsory. Attempt any two questions from section II and two questions from section III Answer to all questions (from section II, III) should be written in the one and the same answer book. Figures to the right indicate full marks. Use of log table and non programmable calculators is allowed.
Section I
Q.1
Answer the following:
14
Define stereoselective and stereoelective polymerization.
What is the requirement of monomer to get stereoisomerism by ROP?
Why syndiotactic poly (propylene oxide) is optically inactive.
What is the persistant radical effect? Give details on its effect.
Why vinylidine chloride does not show stereoisomer's after polymerization.
Name the different factors depends the coordination ability of monomers.
Can we use ATRP polymerize all Vinyl monomers? Give reasons.
Section II
Q.2
Discuss the different types of copolymers with suitable examples and suggest which method is suitable for differentiation of these copolymers.
07
Discuss the stereoisomerism of polymerization of 1-3 butadiene when it undergoes polymerization by different modes.
07
Q.3
Discuss the formation of Stereo regular polymers from isoprene using Z-N catalyst.
07
What is ATRP? Explain the mechanism of ATRP with its advantages.
07
Q.4
Explain the Synthesis of Multi block Copolymers; Condensation types with suitable examples.
07
Discuss the stereoisomerism of polymerization of acrylontrile.
07
Section III
Q.5
Describe the kinetic rate expressions for Z-N polymerization.
05
Discuss the Nitroxide-Mediated polymerization method with suitable examples.
05
Discuss the mechanism of ABA triblock formation with suitable examples.
04
Page 2 of 2
SLR-UF-205
Q.6
Explain optically inactive monomer on Stereo regular polymerization yield optically inactive polymer.
05
Explain the bimetallic mechanism in non polar vinyl monomer with help of suitable example.
05
Discuss the mechanism of coordination polymerization with suitable example.
04
Q.7
Write a note on any THREE of the following.
14
AB diblocks synthesis and applications
Monometallic Mechanism used for synthesis of polypropylene
Advantages of RAFT over ATRP technique
Components of Ziegler-Natta initiators
Mechanism of olefin metathesis