Addition Polymerization

Question 1

What are the three steps in polymerization?

Answer 1

1. Creation of an active site/ initiation stage
2. Propagation stage
3. Termination

Question 2

Methods of terminating a growing polymer?

Answer 2

1. Combination of two growing polymers.
2. Termination by disproportionate: The combination of two growing radicals to form a dead polymer and byproducts with the release of hydrogen.

Question 2

Types of initiators/ Free radical generators

Answer 2

1. Free radical generators (largely peroxides)
2. Ions
3. Co-ordination

Question 3

What is propagation?

Answer 3

Propagation is the quick and progressive addition of a monomer to a growing chain.

Question 3

The Free Radical Polymerization Model?

Answer 3

Rp = Kp.[Kd/Ktc]^0.5.[I]^0.5.[M]

Question 4

Methods of Activation/Initiation of an addition polymerization reaction?

Answer 4

1. Use of initiator
   a. Free radical generators
   b. Use of ionic generators.
   c. Co-ordination
2. Use of redox generators
3. Use of high energy radiation
4. Thermal or photochemical initiation

Question 5

Steps involved in the kinetics of free radical polymerization

Answer 5

1. Initiation
   a. Homolysis
   b. Bonding of free radical
2. Propagation
3. Termination