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National Open University Exam Past Question – CHM 302 OCTOBER/NOVEMBER 2014 EXAMINATION

NATIONAL OPEN UNIVERSITY OF NIGERIA

1416 AHMADU BELLO WAY, VICTORIA ISLAND LAGOS SCHOOL OF SCIENCE AND TECHNOLOGY

OCTOBER/NOVEMBER 214 EXAMINATION

 

 

CHM 302:                             Polymer Chemistry 1

Time:                                    2 Hours

INSTRUCTION:                   Answer any four Questions

 

  1. 1. a) Write short notes on the significant contributions and discoveries made by the following scientist in Polymer Chemistry;

iHermann Staudinger (4 marks) iiLouis Chardonnet     (4 marks) iiiJohn Wesley Hyatt   (4 marks)

 

b)i. Classifypolymers based on their stereochemistry. (3 marks)

  1. ii. List the five patterns of reactions that occur in Addition Polymerizatio (2½marks)

 

  1. 2. a) i. Explain briefly the mechanism of the Zielgler-Natta process for substitutedethylenes and the reaction pathw (4½ marks)
  2. Write briefly on Biodegradation in Polymers. (5 marks)

b)Elucidate on the different types of Copolymers and give diagrammatic illustrations. (8 marks)

 

  1. 3. a)  Explain the term Specialty Chemicals. (4marks)
  2. List 7 guidelines to be taken into cognizance in the production of an appropriate polymer. (3½ marks)
  3. b) Derive the chemical equation involved in the formation of nylon (polyamide) and Dacron

(polyester). (10 marks)

 

  1. 4. There are 3 established methods for producing Polyethylene,these include;
  2. Process of High Pressure ii.          Phillips Process

iii.         Ziegler Process

  1. a) Discuss each of these processes. (6 marks)
  2. As an industrialist, which of these methods is most preferred in the production of
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Polyethylene and justify your preference? (3 marks)

  1. b) Explain the term Solubility. (2½ marks)
  2. Give 3 applications of Solubility. (3 marks)
  3. c) Give 3 advantages of Solvay process over the Leblanc pr (3 marks)

 

  1. 5. a) Describe the mechanism involved in the following reactions;(15 marks)
  2. Radical Addition Chain growth polymerization ii.          Cationic Addition Chain growth polymerization iii.         Anionic Addition Chain growth polymerization

 

  1. b) Polarity is a factor that affects Solubilit Explain (2½ marks)

 

  1. 6. a)   Elucidate the effect of Cross-linking on Polymers. (6 marks)
  2. Write briefly on Condensation polymers. (2½
  3. b) In each of the under listed addition chain growth reactions, outline the causes of the following;
  4. Termination of the Cationic Addition- Chain growth reaction (3marks)
  5. Termination of the Anionic Chain growth reaction (3 marks)

iii. Termination of the Radical Chain growth reaction (3 marks)

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