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Which of the following polymers is not formed with cross-linking between chains?

1. Melmac
2. Bakelite
3. Polythene
4. Vulcanised rubber

Correct answer: Polythene

Solution

Melmac (melamine-formaldehyde), Bakelite (phenol-formaldehyde) and vulcanised rubber are all cross-linked (network) polymers. Polythene is a linear/branched chain-growth polymer with no cross-links, so it is the odd one out.

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