High Refractive Index Thermosets from Linear Polysulfide Polymers
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초록
내용
High refractive index polymers (HRIPs) have recently emerged as an important class of materials for a wide range of optoelectronic devices. The most widely used approach for the synthesis of HRIPs is the incorporation of aromatic units into the polymer structure. This approach, however, while increasing the refractive index, often cause increased birefringence and chromatic aberration. Herein, we report the development of transparent thermosetting polymers free of aromatic groups. The thermoset HRIP consists of a poly(ethylene tetrasulfide) prepolymer, prepared by simple interfacial polymerization between aqueous tetrasulfide and dichloroethane, a bis-episulfide, sulfur and selenium sulfide. Polymerization is induced by using an appropriate nucleophile. Rigid and transparent thermosetting polymer was obtained and showed glass transition temperature of 57 – 85 ℃ and refractive index of 1.7261 – 1.7383 at 633 nm.