M.Sc. (Semester III) (CBCS) Examination Mar/Apr-2018
Polymer Chemistry
SPECTRAL AND INSTRUMENTAL ANALYSIS OF POLYMERS
Time: 2½ Hours
Max. Marks: 70
Instructions: Attempt in all five questions. Section I is compulsory. Attempt any two questions from Section II and any two questions from Section III. All question carry equal marks. Figures to the right indicate full marks. Use of log table and non programmable calculator is allowed.
Section I
Q.1
Answer the following.
14
Calculate the wave number for the IR radiation whose wavelength is 5
List the causes of line broadening in solid state CMR of polymer.
List four applications of SEM analysis of polymers.
What is the meaning of term XPS?
Write down the formula used for determination of degree of crystallinity by XRD technique.
Schematically show n→π∗ and transition, for UV spectra and give example of compound showing these transitions.
List four advantages of FT-NMR technique.
Section II
Q.2
Explain the use of powered crystal diffraction method to determine structure of polymers and list out advantages and limitations of this method.
07
Discuss the applications of the SEM and AFM technique for microstructure analysis of polymers.
07
Q.3
Explain the analysis of two stereo regular polypropylenes by solid state CMR.
07
Define the terms hypsochromic, hyperchromic, hypochromic and bathochromic shifts and how composition of styrene in copolymer styrene-butadiene is determined by using UV spectroscopy technique?
07
Q.4
Discuss the production of X-rays in laboratory using Coolidge X-ray tube and state the Braggs law of diffraction and give meaning of terms involved.
07
Draw TGA curve for Kapton polyimide and explain the use of this technique is to study the thermal stability of polyimide.
07
Section III
Q.5
Draw the schematic diagram for Pyrolysis GC-MS technique for polymer analysis and list advantages and limitation of this technique.
05
Describe the solid state CMR of poly (phenylene sulfide) PPS.
05
Compare the theory and applications of SAXS and WAXS.
04
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SLR-UF-197
Q.6
Discuss the principle and applications of the AFM technique for analysis of polymers.
05
Identify the number of signals in CMR spectrum of (R)-4-methyl
pentan-2-ol. How many signals obtained for deuterate hydrogen in H-1 NMR Spectrum?
05
Discuss the various fundamental modes of vibration of molecule observed in IR.
04
Q.7
Write a note on any Three of the following.
14
Laue's photographic method for polymer analysis
FAB-MS principle and applications for polymer analysis
Applications of POM for polymer analysis
Survey of characterization technique for polymers