Structures and packing of ferrocenylmethyl methacrylate and ferrocene-1,1′-diylbis(methylene) dimethacrylate

Electroactive metallocene polymers are of interest due to the possibility that they offer a muscle-like response, and in gel systems very large volume changes are possible. The ferrocenyl moiety exhibits physical and electrochemical stability of the neutral and oxidized forms and could be a candidate for use as the redox-active group in these materials. The title compounds, [Fe(C5H5)(C10H11O2)], (I), and [Fe(C10H11O2)2], (II), comprise a typical ferrocene core with coplanar and approximately eclipsed cyclopentadienyl (Cp) rings. In (I), there is a single methyl methacrylate substituent, with the other Cp ring unsubstituted. In (II), a methyl methacrylate substituent on each Cp ring completes the structure. In both compounds, there is an s-transgeometry of the vinyl and carbonyl components of the methacrylate group. Inversion dimers formed through C—H...O contacts dominate the crystal packing of both molecules. Weak C—H...π(ring) contacts and, in the case of (I), an unusual C—H...π(alkene) contact further stabilize the structures.

Flame Retardant Polyolefins: Impact and Flow Enhancement Using Metallocene Polymers

Metallocene catalyzed olefin copolymers offer new opportunities for modification of highly filled polyethylene polymers. Modification of HDPE with metallocene LLDPE copolymers results in improved performance when compared to the addition of conventional LLDPE. Modification of flame retar dant HDPE with these materials can impart improved flow and impact resis tance. General stabilization, coupling, and compounding considerations are re viewed. The flame retardant HDPE formulations are suitable for use in injection molded furniture required to meet European and North American burn test standards.