No, bifunctional does not refer to making two different types of bonds. It refers to a crosslinking agent that has two reactive groups. These two reactive groups can react with two different polymer chains to form a cross-link.

A crosslinking agent can be either bifunctional or monofunctional. A bifunctional crosslinking agent has two reactive groups, while a monofunctional crosslinking agent has only one reactive group.

In the case of divinylbenzene (DVB), it is a bifunctional crosslinking agent because it has two alkenyl groups that can react with two different polymer chains to form a cross-link.

Maleic anhydride is a monofunctional crosslinking agent because it has only one carboxylic acid group that can react with two polymer chains to form a cross-link through a Diels-Alder reaction.

The choice of bifunctional or monofunctional crosslinking agent depends on the desired properties of the crosslinked polymer. A bifunctional crosslinking agent will produce a more crosslinked polymer with better mechanical properties, but it may also make the polymer more brittle. A monofunctional crosslinking agent will produce a less crosslinked polymer with better flexibility.
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