---
title: "Monomers of polyurethane, nylon 6,6, Bakelite, epoxy"
subject: "Engineering Chemistry"
chapter: 4
key: "semester_2/engineering_chemistry:monomers-polymers"
source: https://www.bctengineer.com/q/semester_2/engineering_chemistry/monomers-polymers
site: BCT Engineering
---

# Monomers of polyurethane, nylon 6,6, Bakelite, epoxy

Engineering Chemistry · Chapter 4: Engineering Polymers

- Asked in: 2069 Bhadra, 2 marks
- Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_2/engineering_chemistry/monomers-polymers
- Whole chapter: https://www.bctengineer.com/md/semester_2/engineering_chemistry/chapter-4

## Question

What are monomers of: (i) Polyurethane (ii) Nylon 6,6 (iii) Bakelite (iv) Epoxy resin.

## Short answer

Polyurethane: diisocyanate and diol. Nylon 6,6: hexamethylenediamine and adipic acid. Bakelite: phenol and formaldehyde. Epoxy resin: bisphenol-A and epichlorohydrin.

## Answer

| Polymer | Monomers |
|---|---|
| (i) Polyurethane | A diisocyanate (e.g. toluene-2,4-diisocyanate, OCN–R–NCO) and a diol/polyol (e.g. ethylene glycol, HO–R'–OH) |
| (ii) Nylon 6,6 | Hexamethylenediamine, H₂N(CH₂)₆NH₂, and adipic acid, HOOC(CH₂)₄COOH |
| (iii) Bakelite | Phenol (C₆H₅OH) and formaldehyde (HCHO) |
| (iv) Epoxy resin | Bisphenol-A and epichlorohydrin |

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. What are the monomers of Nylon 6,6?
   A. Phenol and formaldehyde
   B. Bisphenol-A and epichlorohydrin
   C. Hexamethylenediamine and adipic acid
   D. Diisocyanate and diol
   Answer: C. Nylon 6,6 comes from H2N(CH2)6NH2 and HOOC(CH2)4COOH. (Key point: Nylon 6,6)

2. What are the monomers of Bakelite?
   A. Styrene and benzoyl peroxide
   B. Hexamethylenediamine and adipic acid
   C. Bisphenol-A and epichlorohydrin
   D. Phenol and formaldehyde
   Answer: D. Bakelite is a phenol–formaldehyde resin. (Key point: Bakelite)

3. Polyurethane is made from which monomers?
   A. A diisocyanate and a diol/polyol
   B. Phenol and an amine
   C. Adipic acid and a diamine
   D. Two diols only
   Answer: A. e.g. toluene-2,4-diisocyanate with ethylene glycol. (Key point: Polyurethane)

4. Which pair is correct for epoxy resin?
   A. Phenol and formaldehyde
   B. Bisphenol-A and epichlorohydrin
   C. Diisocyanate and diol
   D. Vinyl chloride and styrene
   Answer: B. Epoxy resin monomers are bisphenol-A and epichlorohydrin. (Key point: Epoxy resin)

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