Question $1$

Define the following

Polymer

$[1]$

Monomer

$[1]$

Thermosetting

$[1]$

Thermoplastic

$[1]$

Elastomers

$[1]$

Vulcanization

$[1]$

Resin

$[1]$

Plastics

$1$

Syndiotactic

$[1]$

Isotactic

$[1]$

Atactic

$[1]$

a$)$ Give $5$ examples of polymers and their chemical structures

$10$

b$)$ Give $5$ advantages of organic polymers over metals

$10$

Question $2$

Mention and illustrate $7$ types of copolymers.

Draw the structure of the idealized modulus$-$temperature for thermoplastic and thermosets curve and mention all the transitions.

Differentiate between the initiation, propagation and termination steps of a chain reaction polymerization.

Show a laboratory preparation of polycarbonate and propose a mechanism.

Why for Kevlar the Cis conformation is impossible. Draw the structure, illustrate and explain

$3$

Give a reaction for the synthesis of Polysulfides.

$1$

Differentiate between hydrogen, ionic and covalent bonding. Hint. Draw and motivate

Give $3$ differences between van der Waal and dipole forces Hint. Draw and motivate

Give $5$ differences between HDPE,LDPE and LLDPE

$5$

$2$

module code$/101/3/2024$

Question $3$ Innovation on waste management and environment

What is a main waste component in your immediate environment and what you think could be lasting solution for the control of the waste?

$5$

Give at least two projects and explain each which could be done to address water crisis in SA $[5]$

Give at least two projects and explain each which could be done to address load shedding in SA

Propose $4$ products which could be developed from used tires and explain why each product could be competitive in the current market

$5$

Total $=80$