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Regarding cross-linked or network polymers, which of the following statements is incorrect?

1. They contain covalent bonds between various linear polymer chains.
2. They are formed from bi- and tri-functional monomers.
3. They contain strong covalent bonds in their polymer chains.
4. Examples are bakelite and melamine.

Correct answer: They contain strong covalent bonds in their polymer chains.

Solution

Option C is incorrect because cross-linked or network polymers have strong covalent bonds between the chains, not within the chains themselves. The polymer chains are held together by covalent cross-links, but the chains themselves may not necessarily have strong covalent bonds throughout.

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