Question

Which of the following is an example for chain-growth polymer?

• A. \( \text{Bakelite} \)
• B. \( \text{Teflon} \)
• C. \( \text{Nylon} \)
• D. \( \text{Terylene} \)

Hint:

Chain-growth polymerization involves monomer addition with unsaturated bonds, while step-growth polymerization involves small molecule reactions to form polymers.

Answer 1

The Correct Option is B

Step 1: Definition of Polymerization Types
Polymerization can be broadly classified into two types:
1. Chain-growth polymerization: This type involves the successive addition of monomers to a growing polymer chain. It starts with the initiation of free radicals, cations, or anions, and the polymer grows by adding monomers that typically contain double bonds.
2. Step-growth polymerization: In this process, polymer formation occurs through the reaction of small molecules that form covalent bonds, leading to the creation of a polymer. This type of polymerization is characterized by the formation of a polymer from the reaction of bifunctional or multifunctional monomers.
Step 2: Identification of Polymers
Let's classify the given polymers:
Teflon: This is made through chain-growth polymerization, as it involves the addition of monomers (tetrafluoroethylene) in the presence of free radicals.
Bakelite: A result of step-growth polymerization, made by the reaction of phenol and formaldehyde.
Nylon: Another example of step-growth polymerization, made from a diamine and a dicarboxylic acid.
Terylene: Also a product of step-growth polymerization, formed by the reaction of terephthalic acid and ethylene glycol.
Conclusion: Based on the nature of the polymerization process and the type of polymer involved, Teflon is the polymer formed through chain-growth polymerization. Therefore, the correct answer is: \[ \boxed{\text{Teflon}} \]