X is a cross linked polymer. Suggest the type of bonding that holds the chains together in the cross links?

X is polyHEMA. Theres a drawing ill try to explain it.

There are two carbons in the middle of the repeating unit, one is bonded to CH3 and H, the other to H and:
another c, which has a double bond to O then another bond to another O. This other O is then attached to CH2CH2OH.

I thought is was instantaneous induced but i think it might be covalent or something.

Note, this isn't my homework its a past paper i dont have the mark scheme for :(

Answer:
The cross-linked bonding in Hydrogels such as Polyhema are hydrogen bonds or strong Van der Waals interactions.

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