Optically Transparent Sulfur-containing Semi-alicyclic Polyimide with High Refractive Index

Sulfur-containing semi-alicyclic polyimides (PIs) with high refractive indices up to 1.7272 at 632.8 nm have been prepared by the Michael polyaddition of sulfur-containing bismaleimides (SBMIs) with 4,4'-thiobis(benzenethiol) (TBT). These PIs also showed high transparency in the visible region, low birefringence (Δn), and a high glass transition temperature.

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