NATIONAL OPEN UNIVERSITY OF NIGERIA
14/16 AHMADU BELLO WAY, VICTORIA ISLAND, LAGOS
SCHOOL OF SCIENCE AND TECHNOLOGY
MARCH/APRIL 2014 EXAMINATION
COURSE CODE: CHM 302
COURSE TITLE: POLYMER CHEMISTRY 1
TIME ALLOWED: 2 HOURS
INSTRUCTION: ANSWER ANY FOUR QUESTIONS
Question 1
a) Outline and discuss the classification of polymers based on their chemical mode of formation and physical properties. (5 marks)
b) List the various patterns of reaction that occur in Addition polymerization. (5marks)
c) i) Define Copolymers. (1½)
ii) Outline and briefly explain the different types of copolymers. (6marks)
Question 2
a) Write short notes on the following: (12 marks)
i) Elastomers
ii) Fibers
iii) Resins
iv) Thermosetting
v) Thermoplastics
vi) Plastics
b) Describe Cross-linked polymers(2½ marks)
c) Outline the 3 groups of polymers based on their stereochemistry.(3 marks)
Question 3
a) Outline and discuss the established methods of producing polyethylene and give justification. (5½ marks)
b) List the 5 resources from Solid Minerals. (5 marks)
c) i) Discuss on the 2 main polymerization reactions. (4 marks)
ii) Outline the 3 stages that occur in addition chain growth polymerization. (3 marks)
Question 4
a) Write short notes on the following: (12 marks)
i) Specialty chemicals
ii) Radical addition chain growth polymerization
iii) Cationic addition chain growth polymerization
iv) Anionic addition chain growth polymerization
b) Discuss on Condensation polymers. (5½ marks)
Question 5
a) Discuss on the following properties of polymers: (10 marks)
I. Tensile strength
II. Young’s modulus
III. Glass transition temperature
IV. Melting point
b) Explain the following: (7⅟2 marks)
a) Recycling of polymers
b) Chlorine attack (acetal resin plumbing joints)
c) Biodegradations in polymers
Question 6
a) Differentiate between natural and synthetic rubber. (4 marks)
b) Mention any 4 guidelines to be taken into cognizance in designing synthetic polymerization reactions to produce the desired products. (4 marks)
c) Explain the Ozone cracking in natural rubber tubing. (6 marks)
d) Discuss briefly on Cross-linking in polymers. (3½ marks)
You can get the exam summary answers for this course from 08039407882
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