Photocurable transparent cycloaliphatic epoxy hybrid materials crosslinked by oxetane

Abstract

Organic/inorganic hybrid materials (hybrimers) were fabricated by the photocationic polymerization of sol-gel-derived cycloaliphatic epoxy oligosiloxane (CAEO)/oxetane blends. The CAEO/oxetane blends showed faster photocationic polymerization rates compared to a CAEO resin. The CAEO/oxetane hybrimers showed a high crosslinking density and flexibility with the addition of oxetane monomer. The increased crosslinking density improved the insulation properties and lowered their dielectric constant. The CAEO/oxetane hybrimer with a substantial thickness of 2 mm showed high transparency (>90%) in the visible range. On the basis of these properties, the CAEO/oxetane hybrimers could be applied to various applications, including optics and display fields.

Oxetane-terminated telechelic epoxy-functional polyesters as cationically polymerizable thermoset resins: Tuning the reactivity with structural design

“…Other factors such as the differences in reaction enthalpies also affect the polymerization rates. This and other studies mainly dealing with primary epoxides and oxetane monomers clearly show that epoxy and oxirane monomers readily copolymerize to give polyether polymers with varying ether segments due to the specific copolymerization rates …”

Cationic photopolymerization of 3‐benzyloxymethyl‐3‐ethyl‐oxetane

“…Research about oxetane‐based monomers for cationic polymerization has been reported. Yang et al fabricated cycloaliphatic epoxy oligo‐siloxane/oxetane organic/inorganic hybrid materials which showed a high crosslinking density and flexibility and could be applied to various applications, including optics and display fields. Feser and Meerholz reported that oxetane‐functionalized organic semiconductors have been used for fabricating multilayer organic light‐emitting diodes from solution and for lithographic patterning and the interplay between the photoacid generator and the oxetane‐functionalized semiconductor can notably affect the device performance.…”

Cationically photopolymerizable epoxy-functionalized thermoplastic polysilsesquioxanes: synthesis and properties

“…15 Epoxy groups may also be cationically photopolymerizable using photoacid generating catalysts. 16 While the crosslinking speed has been known to be lower than conventional acryl or thiol-ene formulations, the living polymerization nature of these curing systems have been useful for the tuning of optical and mechanical properties.…”