Polysiloxanes radical polymerization Hybrid

Pyun, J. Xia, J. Matyjaszewski, K. Organic-Inorganic Hybrid Materials from Polysiloxanes and Polysilsesquioxanes Using Controlled/ Living Radical Polymerization. In Synthesis and Properties of Silicones and Silicone-Modified Materials Clarson, S. J., Fitzgerald, J. J., Owen, M. J., Smith, S. D., Van Dyke, M. E., Eds. ACS Symposium Series 838 American Chemical Society Washington, DC, 2003 pp 273—284. 

Hybrid graft copolymers having silicon-based polymer backbones were also prepared by the metal-mediated radical polymerizations of styrene. The phenyl groups of poly[(methylphenyl)silylene] were bromomethylated and then employed as the grafting points of polystyrene (G-16).294,441 Polysiloxane can be employed also as a backbone (G-17) by introduction of benzyl chloride units into the pendant vinyl-functionalized poly(dimethylsiloxane).409... 

Materials related to polysiloxanes are silsesquioxanes (Scheme 1) (2). These cubic siloxane molecules have been produced with a number of functional species such as styrene and methacrylate moieties protruding from one corner of the structure (3, 4). Classic free radical polymerization of these molecules has been shown to produce an inorganic / organic hybrid homopolymer. Furthermore, cubes have been synthesized with pendant silyl hydrido and silanolate moieties which can be used for further functionalization (5). 

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