Loyola College B.Sc. Chemistry Nov 2006 Polymer Chemistry Question Paper PDF Download

by

                      LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034  B.Sc. DEGREE EXAMINATION – CHEMISTRY

AD 07

FIFTH SEMESTER – NOV 2006

         CH 5400 – POLYMER CHEMISTRY

(Also equivalent to CHE 400/CH518)

 

 

Date & Time : 30-10-2006/9.00-12.00     Dept. No.                                                       Max. : 100 Marks

 

 

PART – A

Answer ALL questions                                               (10 ´ 2 = 20 marks)

  1. What are plastics? How are they classified?
  2. How is cross–linked polymer prepared from trifunctional monomers?
  3. What are the initiators used in free–radical polymerization?
  4. How does nitrobenzene inhibit the action of a growing polymer chain?
  5. Define living polymers.
  6. Give any two examples for each anionic and cationic surfactants.
  7. Write the advantages of suspension polymerization.
  8. Define block copolymer and graft copolymer.
  9. What are ‘antioxidants’ ? Give an example.
  10. Define virgin polymers.

PART – B

Answer any EIGHT questions.                                   (8 ´ 5 = 40 marks)

  1. Discuss the mechanism of cationic polymerization.
  2. The polymer obtained by bulk polymerization is highly pure. Why? Explain.
  3. Write short notes on interfacial condensation.
  4. Explain the geometrical isomerism in polymers.
  5. Differentiate random and chain–end polymer degradation.
  6. What are the raw materials used to prepare polyethylene? Explain LDPE and HDPE.
  7. Write a note on PMMA.
  8. Discuss the factors affecting the c–c bond stability in thermal degradation.
  9. Explain the different types of plastics.
  10. Define the following terms.

(a)  Fillers        (b)  plasticizers            (c) stabilizers

  1. Discuss the process of Die–casting.
  2. Explain the advantages and disadvantages of extrusion moulding.

 

PART – C

Answer any FOUR questions.                                                (4 ´ 10 = 40 marks)

 

23.(a) Explain the mechanism of photo–initiated polymerization.  Write the role of
initiators in redox–oxidation reaction.

(b) How does the chain transfer takes place in free–radical polymerization?  (5 + 5)

  1. Explain the bimetallic mechanism of Zieglar–Natta catalyst and its advantages.
  2. Discuss emulsion polymerization.
  3. (a) What is photodegradation? Explain the characteristics of photo stabilizers.

(b) Discuss the salient features of conducting polymers.                         (5 + 5)

  1. (a) How is PET prepared? Why does its melting point high?

(b) Explain the preparation of nylon 6,6 and bakelite.                             (5 + 5)

  1. What is FRP? Explain the different techniques used and mention their
    applications.

Go To Main Page

Latest Govt Job & Exam Updates:

View Full List ...

© Copyright Entrance India - Engineering and Medical Entrance Exams in India | Website Maintained by Firewall Firm - IT Monteur