M.Sc. (Semester III) (CBCS) Examination Oct/Nov-2017
Polymer Chemistry
SPECTRAL AND INSTRUMENTAL ANALYSIS OF POLYMERS
Day Date: Saturday, 25-11-2017 Max. Marks: 70
Time: 02.30 PM to 05.00 PM
Instructions: Attempt five questions.
Section-I is compulsory.
Attempt any two questions from Section-II.
Attempt any two questions from Section -III.
All question carry equal marks.
Figures to the right indicate full marks.
Use of log tables and non programmable calculators is allowed.
Section I
Q.1 Answer the following 14
Draw chemical stricture of TMS. Give four reasons for using TMS as a
reference standard in NMR.
Define the term Hypsochromic shift. What is the range of UV-Visible
region?
State the Braggs equation and explain the various terms involved in it.
In AFM technique which material is used to make cantilever?
Carbon-Carbon double bond in ethylene is inactive towards IR. Give
reasons.
Write down the formula used for determination of degree of crystallinity of
polymers by XRD.
Draw the DTA curve for polystyrene showing Tg at 100 0C.
Section II
Q.2 Draw the typical TGA curve for thermally stable polyimide and illustrate
T0, T10, Tmax, and IPDT terms point on curve.
07
Discuss the use solid state C-13 NMR technique for the study of stereo
regularity in polypropylene.
07
Q.3 State the Beer-Lambert law and discuss the use of UV spectroscopy for
the analysis of composition of monomers in copolymer SBR.
07
With the help of schematic diagram, describe the use of rotation crystal
method for morphological study of polymer and list any advantages of
this method.
07
Q.4 Discuss the principles DTA and AFM techniques. List two applications of
each technique in polymer analysis.
07
Discuss the various methods of decoupling used for simplification of solid
state CMR spectra. Give suitable exmples.
07
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Section III
Q.5 Draw the schematic diagram for sophisticated FT-NMR instrument and
List any four advantages FT-NMR.
05
Compare the theory and applications of SAXS and WAXS. 05
Discuss the use of Raman technique to study the kinetics of reaction.
Illustrate your answer with suitable example.
04
Q.6 Duscuss the different sampling technique in IR used for characterization
of polymers.
05
Determine the structure of monomer and the polymer P1, P2 from
data below.
monomer C9H14O2
Polymerization
P1
H OH
P2
05
Monomer (C9H14O2 P1 P2
MW 7700 MW 4900
IR =1730, 1630, 800. Cm-1 IR 1730 cm-1 IR=3300-3100 (broad) cm-1
Explain the factors affecting the nature of TGA curves of polymers. 04
Q.7 Write a notes (any three): 14
Principle and Applications of SEM technique.
Application of FAB-MS technique.
Determination of crystallinity, size and orientation of crystallites by XRD.
ATR technique in IR spectroscopy.