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Question 27 of 40

Q.(i) Identify the two monomers in the following polymer: —[NH–(CH2)6–NH–C(=O)–(CH2)4–C(=O)–]n.

(ii) What is condensation polymerisation reaction?
West Bengal WbchseWest Bengal HS (WBCHSE) Board 2016Subjective· 2mImportance★★★★★
68% · 27/40 Questions
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The repeat unit —[NH–(CH₂)₆–NH–CO–(CH₂)₄–CO–]ₙ is Nylon-6,6, built from hexamethylenediamine and adipic acid via condensation (amide-forming) polymerisation.

(i) Monomers: Reading the repeat unit —[NH–(CH₂)₆–NH–C(=O)–(CH₂)₄–C(=O)–]ₙ, it is made of two alternating six-carbon-and-four-carbon fragments joined by amide (–NH–CO–) linkages. This is the standard Nylon-6,6 repeat unit, formed from:

  • Hexamethylenediamine, H2N−(CH2)6−NH2H_2N-(CH_2)_6-NH_2 (contributes the two –NH– ends and the (CH₂)₆ chain)
  • Adipic acid, HOOC−(CH2)4−COOHHOOC-(CH_2)_4-COOH (contributes the two carbonyl groups and the (CH₂)₄ chain) …
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