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How many of the following are condensation copolymers? (i) BUNA-S (ii) BUNA-N (iii) Nylon-6 (iv) Dacron (v) Neoprene (vi) PHBV (vii) Nylon-2-Nylon-6 (viii) Teflon (ix) Bakelite (x) Cellulose

1. 1
2. 2
3. 3
4. 4

Correct answer: 4

Solution

Condensation copolymers in the list: Dacron (iv, condensation of ethylene glycol + TPA), PHBV (vi, condensation of 3-hydroxybutanoic acid + 3-hydroxypentanoic acid), Nylon-2-Nylon-6 (vii, condensation of glycine + aminocaproic acid), and Bakelite (ix, condensation of phenol + formaldehyde). The rest are either addition polymers (BUNA-S, BUNA-N, Neoprene, Teflon), addition homopolymers (Nylon-6), or natural polymers (Cellulose). Total = 4.

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