Answer: Ring-opening polymerisation of epoxide monomers.
- A Ring-opening polymerisation of epoxide monomers
- B Free-radical addition polymerisation of a vinyl monomer
- C Anionic polymerisation initiated by an alkali metal alkoxide
- D Direct condensation with loss of water at every linking step
Correct answer: A. Ring-opening polymerisation of epoxide monomers
Explanation: Epoxy resins are formed by ring-opening of epoxide (oxirane) groups with amines or anhydrides.
Addition polymerisation simply links monomers containing a double bond with nothing left over, while condensation polymerisation joins two different monomers through a reaction (often forming an ester or amide bond) that releases a small molecule like water at each step.
Concept context
Large molecules made of repeating monomer units. Covers addition and condensation polymerisation, natural and synthetic polymers (nylon, PVC, Bakelite, natural rubber), and their real-world industrial applications.