What is the name of the process during which a bond between two monomers is broken?

Hydrolysis

Explanation:

Hydrolysis is the process that involves the broken down of polymers into monomers using water molecules during the breakdown. In hydrolysis, molecule that is made up of multiple sub-units is broken down into two in which one molecule gain an hydrogen atom while the other gain hydroxyl group which were both donated by water. Furthermore, hydrolysis involves the breakdown of molecules and generally release energy.