Highly cross-linked, maroporous/mesoporous polymer monoliths are prepard
using supercritical carbon dioxide (scCO.sub.2) as the solvent and porogen
for the polymerisation of monomers having more than one polymerisable
group, at a monomer concentration in CO.sub.2 of more than 40 vol %. The
procedure allows the direct formation of dry, solvent-free,
macroporous/mesoporous cross-linked monoliths with large surface area and
well-controlled pore size distribution.
