Compositions comprising a matrix polymer and a mixture of monomers are
used for making polymer mixtures containing the matrix polymer and a
second polymer formed from the monomer mixture. Preferably, the matrix
polymer comprises a polyester, polystyrene, polyacrylate, thiol-cured
epoxy polymer, thiol-cured isocyanate polymer, or mixtures thereof.
Preferably, the monomer mixture comprises a thiol monomer and at least
one second monomer selected from the group consisting of ene monomer and
yne monomer. The compositions may be used to fabricate optical elements
such as lenses.