Master of Science III (Polymer Chemistry)
Examination: Oct Nov 2016 Semester III (New CBCS)
SLR No. Day
Date Time Subject Name Paper
No. Seat No.
SLR SD
223
Wednesday
23/11/2016
02.30 PM
to
05.00 PM
Spectral and Instrumental
Analysis of Polymers
C
XII
Instructions: Answer any five questions.
All questions carry equal marks.
Section-I is compulsory.
Attempt any twoquestions from Section II
Attempt any two questions from Section III
Answer to all questions should be written in the one answer
book.
Use of log table and calculators in allowed.
Total Marks:70
SECTION I
Q.1 Answer the following: 14
Draw chemical structure of TMS. Give any four reasons for using TMS as a
reference standard in NMR.
Define the terms bathochromic shift and hypsochromic shift.
State the rule for selection of target material for laboratory production of
X-rays.
List any four applications of SEM technique for polymer analysis.
List two advantages and two limitations of Pyrolysis GC-MC technique for
polymer analysis.
Calculate the wave number for IR radiation whose wavelength is 5
Write down Braggs equation and explain the various terms involved in it.
SECTION II
Q.2 Discuss in brief the applications of DTA and TEM technique. 07
Discuss the various methods of decoupling used for simplification of solid
state 13C-NMR spectra. Give suitable examples.
07
Q.3 Explain the use of Raman Spectroscopy for the determination of copolymer
composition in poly ether sulphone (PEES) and poly ether ether sulphone
(PEES).
07
Discuss the use of the powdered diffraction method to determine dimension
of polymer unit cell.
07
Q.4 Draw the typical TGA curve for thermally stable polyimide and illustrate T0,
T50, T max, and DPDT terms.
07
Explain the determination of Cis and Trans isomerisation in polybutadience
by solid state C-13 NMR.
07
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SECTION III
Q.5 Explain the term COSY with suitable example for 1H-1H. specta. 05
Discuss the various methods of sample preparation for analysis of polymers
by TEM.
05
Explain the factors affecting the nature of DTA and TGA curves. 04
Q.6 Calculate the numbers of signals appearing in a broad band decoupled
13C-NMR spectrum of the following two pyrenediols and
respectively.
05
Discuss the use of IR Spectroscopy to study degradation in PE polymer. 05
Compare the theory and applications SAXS and WAXS. 04
Q.7 Write a note on any three of the following: 14
Principle and Applications AFM technique is polymer analysis.
Applications of FAB-MS technique
Types of electronic transitions in UV Spectroscopy
Survey of characterization technique for polymers
TMA technique, principle and applications.