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In the popular slime experiment for kids, is the cross-link between PVA and the borate ion a covalent bond (with water as the product) or is it hydrogen bonding?

Question asked by Jerry Boyle on Mar 1, 2019
Latest reply on Mar 4, 2019 by Jay Brown

I am finding conflicting information regarding this cross-link. Some mechanisms I find online show it to be hydrogen bonding, while others show a covalent bond as a dehydration reaction.