The present invention provides a proppant or proppant mixture having insert materials configured for providing a mechanical or physical function in a well to hold open fissures or pathways created in formations caused by well fracking to allow a release of a hydrocarbon from the well, the insert materials being configured at least partly with beads having a functionalized polymer so as to form functionalized polymer proppants that are configured to respond to the hydrocarbon or other composition of matter released from the well, including water, and provide at least one chemical taggant containing an indication about the hydrocarbon or other composition of matter released from the well. The functionalized polymer may include a dual-monomer structure.