The inclusion and Co-60 gamma-ray initiated polymerization of olefinic and acrylic monomers within the 10 Angstrom clathrate-tunnels formed by tris(2,3-naphthylenedioxy)cyclotriphosphazene is described. Methyl acrylate, butyl acrylate, hexyl acrylate, octyl acrylate, isoprene, dimethylbutadiene, acrylonitrile, and methacrylonitrile monomers were included by direct contact imbibition. The resultant polymers were characterized by H-1 and C-13 NMR spectroscopy, and the molecular weights were estimated by gel permeation chromatography and solution viscometry. The results are explained in terms of the host/synthesized previously within the 5 Angstrom tunnel of tris(o-phenylenedioxy)cyclotriphosphazene.