High refractive index materials

What is it about?

Design, Synthesis, characterization and structure-property comparison of new families of highly refractive polyamides containing halogen and sulfur atoms.

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Why is it important?

The presence of ortho-sulfide or sulfoxide units, pendant chlorine groups, and flexible ether linkages in the diamine monomers endowed the obtained polyamides with excellent solubilities in organic solvents. The resulting PAs showed high thermal stability and the combination of chlorine substituents, sulfide or sulfoxide linkages, and ortho-catenated structures provided polymers with high transparency along with high refractive index values of up to 1.7401 at 632.8 nm and low birefringences (<0.0075). The structure–property relationships of the analogous PAs containing sulfide or sulfoxide linkages were also studied in detail by comparing the results.