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National Open University Exam Past Question – CHM408 October, 2013 Examination

NATIONAL OPEN UNIVERSITY OF NIGERIA CHM408 POLYMER CHEMISTRY

14/16, Ahmadu Bello Way, Victoria Island

 

SCHOOL OF SCIENCE AND TECHNOLOGY October, 2013 Examination

 

 

COURSE CODE:  CHM408

 

COURSE TITLE:   POLYMER CHEMISTRY Duration: 2 hrs

2

Answer only four questions (each question carriers a total 17  1  marks)

 

Question 1

 1

  1. a) Define the term Polymer. Give five examples of addition polym                          (7 2  marks)
  2. b) Differentiate between condensation polymers and addition polym                   (10 marks)

Question 2

  1. a) Discuss in detail each of the following isomerism:
2
2
2
  1. i) Orientational isomerism.                                                                                                    (3  1  marks) ii)           Geometrical isomerism.                                                                                                     (3  1  marks) iii)          Structural isomerism.                                                                                                          (3  1  marks)
  2. b) Differentiate between tactic and atactic polymers.                                                      (7 marks)

 

Question 3

 1

  1. a) List and explain the types of copolymers that you know. Give examp                (8 2  marks)
  2. b) State any five advantages of copolymerization.                                                            (10 marks)

 

Question 4

  1. a) List and explain the types of polymer solvents.                                                             (6 marks)
2
  1. b) Discuss the solution process which occurs when a polymer is added to a solvent. (5  1  marks)
  2. c) Explain how the following affects polymer solubility:
  3. i) polarity    ii) cross linking        iii) molecular weight      iv) branching                    (8 marks)

 

Question 5

  1. a) Enumerate seven differences between thermoplastic and thermosets                    (7 marks) b)          Outline the relevance of chromatography in the polymer industry                           (6 marks) c)           State three physical properties of polymer that can be identify by the following techniques:
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2
  1. i) infrared/FTIR ii) thermomechanical analysis    iii           X-ray                   (4  1  marks)

 

 

Question 6

  1. a) Discuss in detail the mechanical properties of polymers.                                            (5 marks)
 1
  1. b) Enumerate five agents of degradation and likely susceptible polym                  (7 2  marks)
  2. c) Define polymer degradation and enumerate the types of polymer degradation.   (5 marks)

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