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National Open University Exam Past Question – CHM 408 OCTOBER/NOVEMBER 2014 EXAMINATION

NATIONAL OPEN UNIVERSITY OF NIGERIA CHM 408: POLYMER CHEMISTRY

14-16 AHMADU BELLO WAY, VICTORIA ISLAND LAGOS SCHOOL OF SCIENCE AND TECHNOLOGY OCTOBER/NOVEMBER 2014 EXAMINATION

 

 

CHM 408: POLYMER CHEMISTRY

Answer question 1 and any other three questions

 

 

 

Question 1

Duration: 2 hrs

 

  1. a) i)    What do you understand by ‘ good solvent’ and ‘ poor solvent’ ?          (2 marks)
  2. ii) Mention any five polymers and their dissolution solvents.  (5 marks)
  3. b) What is the relevance of chromatography in the polymer industry?          (6 marks)
  4. c) Identify three physical properties of polymer which can be discovered by the following

techniques:

2
  1. i) infrared/FTIR ii) thermomechanical analysis    iii) X-ray              (4  1  marks)

Question 2

  1. a) Write short notes on each of the following types of isomerism:

1

  1. i) Orientational isomerism.                                                                                                    (3 2  marks)

1

  1. ii) Geometrical isomerism.                                                                                                     (3 2  marks)

1

iii) Structural isomerism. (3 2  marks)
b) Differentiate between tactic and atactic polymers. (7 marks)

 

Question 3

  1. a) Mention six properties of thermoplastics which distinguish it from thermosetting polymers
2

(9 1  marks)

2
  1. b) With the aid of relevant equations describe the mechanism of condensation polymerization. (8 1 marks)

Question 4

  1. a) Explain the significance of these steps in addition polymerization

(i)   Initiation

(ii)  Propagation

 

2
2

(iii) Termination.                                                                              (2 1

  1. b) Explain how the followings affect polymer solubility:
  2. i) polarity    ii) cross linking        iii) molecular weight      iv) branching
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marks each = 7 1

marks)

 

 

 

Question 5

(2 2

marks each = 10 marks)

 

1
  1. a) Give a brief explanation on the mechanical properties of polym (5 marks)

1

  1. b) Enumerate five agents of degradation and likely susceptible polym                  (7 2  marks)
  2. c) Elucidate with illustrations polymer degradation and enumerate the types of polymer degradation.  (5 marks)

Question 6

1

Enumerate and explicate any five simple identification tests for polymer.                   (17 2  marks)

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