The present disclosure relates to materials for radical-initiated activation of a latent catalyst for ring-opening metathesis polymerization (ROMP). The present disclosure also relates to uses of the materials, e.g., in 3D printing.

The present disclosure provide a nitrogen-containing compound, which includes a segment I with a formula of

##STR00001##

wherein a represents number of methylene groups, a is a positive integer, Ar.sub.1 is an aryl structural unit, and R.sub.1 and R.sub.2 are each independently selected from H, a hydrocarbyl group, or a substituted hydrocarbyl group, or, R.sub.1 and R.sub.2 are connected and form a poly-membered ring together with a N atom to which they are connected.

Disclosed is a method of preparing a sulfonate group-based anion resin including: performing a quaternization reaction between a nitrogen-containing compound and a quaternizing agent comprising a sulfonate compound at a temperature of 25C to 120 C. for 3 to 72 hours to obtain the sulfonate group-based anion resin. The nitrogen-containing compound includes at least one of a segment I, a segment II, and a segment III; in which the segment I is

##STR00001##

the segment II is

##STR00002##

and the segment III is

##STR00003##