Question:
Which of the following is not a mechanism of polymerization?
Which of the following is not a mechanism of polymerization?
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Addition, Condensation, and Ring-opening are chemical reactions used to grow long polymer chains from small molecules. Sintering is a thermal powder process used to fuse metallic or ceramic particles together without melting them.
Updated On: Jun 25, 2026
- Addition
- Condensation
- Sintering
- Ring-opening
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The Correct Option is C
Solution and Explanation
Concept:
Polymerization is a chemical reaction process where small, repetitive monomer molecules react together chemically to link up into long, three-dimensional macromolecular polymer chains.
Step 1: Reviewing valid chemical polymerization mechanisms.
Let us examine the established chemical pathways used to synthesize polymers:
• Addition Polymerization (Chain-growth): Monomers containing double or triple covalent bonds (like ethylene) open up their unsaturated bonds to link together sequentially into a chain without producing any chemical byproducts.
• Condensation Polymerization (Step-growth): Bifunctional or polyfunctional monomers react chemically to link together, releasing a small molecular byproduct (such as water, \(\text{H}_2\text{O}\), or hydrochloric acid, \(\text{HCl}\)) at each bond formation step.
• Ring-Opening Polymerization: Cyclic monomer rings (such as caprolactam used to synthesize Nylon-6) are attacked by catalysts, opening their ring structures into linear chains that link up into polymers without releasing small-molecule byproducts.
Step 2: Defining Sintering.
Sintering is a thermal consolidation process used in powder metallurgy and ceramics manufacturing. It involves taking a compacted mass of loose solid particles and heating it inside a furnace below its absolute melting point. The thermal energy drives atomic solid-state diffusion, causing material to migrate across particle contacts to grow necks, close up internal pores, and fuse the independent powder particles into a dense, high-strength bulk object. Sintering is a physical consolidation process, not a chemical mechanism used to synthesize polymer molecules from monomers.
Step 3: Conclusion.
Since sintering is a ceramic/powder fabrication method and not a chemical polymerization pathway, it is the correct answer for this negative question, matching option (C).
Step 1: Reviewing valid chemical polymerization mechanisms.
Let us examine the established chemical pathways used to synthesize polymers:
• Addition Polymerization (Chain-growth): Monomers containing double or triple covalent bonds (like ethylene) open up their unsaturated bonds to link together sequentially into a chain without producing any chemical byproducts.
• Condensation Polymerization (Step-growth): Bifunctional or polyfunctional monomers react chemically to link together, releasing a small molecular byproduct (such as water, \(\text{H}_2\text{O}\), or hydrochloric acid, \(\text{HCl}\)) at each bond formation step.
• Ring-Opening Polymerization: Cyclic monomer rings (such as caprolactam used to synthesize Nylon-6) are attacked by catalysts, opening their ring structures into linear chains that link up into polymers without releasing small-molecule byproducts.
Step 2: Defining Sintering.
Sintering is a thermal consolidation process used in powder metallurgy and ceramics manufacturing. It involves taking a compacted mass of loose solid particles and heating it inside a furnace below its absolute melting point. The thermal energy drives atomic solid-state diffusion, causing material to migrate across particle contacts to grow necks, close up internal pores, and fuse the independent powder particles into a dense, high-strength bulk object. Sintering is a physical consolidation process, not a chemical mechanism used to synthesize polymer molecules from monomers.
Step 3: Conclusion.
Since sintering is a ceramic/powder fabrication method and not a chemical polymerization pathway, it is the correct answer for this negative question, matching option (C).
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