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Regarding cross-linked or network polymers, which of the following statements is incorrect?
Explanation
Cross-linked polymers are defined by covalent bonds between chains, not within chains.
Detailed Solution
Cross-linked or network polymers are formed from bi-functional and tri-functional monomers and contain strong covalent bonds between various linear polymer chains, e.g. bakelite, melamine etc.
The statement 'They contain strong covalent bonds in their polymer chains' is not related to cross-linking, so it is the incorrect statement.