“Loyola College B.Sc. Chemistry April 2009 Polymer Chemistry Question Paper PDF Download”

        LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

WD 15

FIFTH SEMESTER – April 2009

CH 5402 / CH 5400 – POLYMER CHEMISTRY

 

 

 

Date & Time: 28/04/2009 / 1:00 – 4:00  Dept. No.                                                     Max. : 100 Marks

 

 

PART-A                                      

Answer ALL questions.                                                                                               (10 x 2 = 20)

 

  1. Write any two stereo-isomers of polypropylene.
  2. Why does the melting point of Teflon high?
  3. How is polyester prepared? Give an example.
  4. What is living polymerization?
  5. Mention the importance of benzoyl  peroxide in the polymerization reaction with an example.
  6. Give any two drawbacks of solution polymerization.
  7. Differentiate LDPE and HDPE with any four points?
  8. How is polymethyl metha acrylate synthesized?
  9. What are fire retardants?
  10. What are fire reinforcing plastics?

PART-B                                     

Answer ANY EIGHT questions.                                                                                 (8 x 5 = 40)

 

  1. Write short notes on: (a) Elastomers    (b) Polyisoprene rubber
  2. Explain the role of secondary bond forces in polymers.
  3. Discuss the cationic polymerization with mechanism.
  4. Distinguish between number average molecular mass and weight average molecular mass with suitable example.
  5. Explain the process of bulk polymerization.
  6. Derive the rate constant for anionic polymerization.
  7. Write the order of thermal stability of the following polymers and give reasons for the order you select.

Polytetraflouroethylene, Polyphenylene, Polytetraphenylene.

  1. Write and explain the mechanism of phenol formaldehyde polymer.
  2. How are the following polymers synthesized?

(a)Polystyrene   (b) Buna-S

  1. Explain any two methods of polymer degradation?
  2. Explain the process of injection moulding.
  3. Write short notes on: (a) Antioxidants (b) Fillers

PART-C                                    

Answer ANY FOUR questions.                                                                                  (4 x 10 = 40)

  1. Define the following with example.

(a) Oligomers  (b)Degree of polymerization  (c) Isotactic polymer

(d) Syndiotactic polymer

  1. Discuss the mechanism and its importance of Ziegler Natta polymerization.
  2. Explain the emulsion polymerization with diagram.
  3. What is gas phase polymerization? Explain the mechanism.
  4. What are conducting polymers? Discuss the characteristics of conducting polymers.
  5. Explain the process of calendaring with its applications and limitations.

 

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