Radical induced cationic frontal twin polymerization of Si-spiro compound in combination with bisphenol-A-diglycidylether.

Abstract The radical induced cationic frontal polymerization (RICFP) of the twin monomer 2,2′-spirobi[4 H -1,3,2-benzodioxasiline] (SPIRO) in combination with bisphenol-A-diglycidylether (BADGE) has been developed to fabricate nanostructured hybrid material with domain sizes of 2–5 nm. In one reaction step, an interpenetrating network of phenolic resin, SiO 2 and the epoxy resin is formed in a very short time period, initiated by UV light. That indicates that both polymerization reactions take place simultaneously. The influence of monomer composition on molecular structure was investigated by means of solid state NMR spectroscopies. The envisaged nanostructure of the resulting organic-inorganic hybrid materials is proven by high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). The thermal properties of the hybrid materials are comparable to "state of the art" materials with the advantage that the silica quantity can be adjusted on demand. Graphical abstract Image 1 Highlights • Synthesis of a ternary hybrid material by frontal polymerization with very short reaction time of just minutes. • First known attempt to start twin polymerization by light. • Nanostructured hybrid materials obtained by radical induced cationic frontal polymerization observed via HAADF-STEM. • 13C and 29Si solid state NMR spectroscopy was used for structure determination. [ABSTRACT FROM AUTHOR]