High-refractive-index polymers are important optical materials in optoelectronics. Conventional cyclic olefin polymers (COPs), possessing many excellent optical properties, are a class of highly promising optical materials; however, one of the greatest obstacles is their low refractive index of n = 1.52–1.54. Here, one efficient strategy of first incorporating high molar refraction groups, including carbazolyl and indolyl moieties, into unsaturated COPs via ring-opening metathesis polymerization (ROMP) and then introducing another high molar refraction sulfur atom by a subsequent thiol–ene click reaction is presented. The obtained cross-linked COPs bearing both an aromatic group and sulfur possess significantly higher refractive indices (n = 1.611–1.684 at 589 nm) and highly optical transparency (approximately 95%) in the range of vis-NIR. This provides a way toward potential applications of new-generation optical materials.

中文翻译：

---

通过硫醇-烯点击反应获得具有优异透明度的高折射率交联环烯烃聚合物


高折射率聚合物是光电子学中重要的光学材料。传统环烯烃聚合物（COPs）具有许多优异的光学性能，是一类极具前景的光学材料。然而，最大的障碍之一是它们的折射率较低，n = 1.52–1.54。在这里，提出了一种有效的策略，首先通过开环复分解聚合（ROMP）将高摩尔折射基团（包括咔唑基和吲哚基部分）引入不饱和COP，然后通过随后的硫醇-烯点击反应引入另一个高摩尔折射硫原子。所获得的同时带有芳香基团和硫的交联 COP 在 vi​​s-NIR 范围内具有显着更高的折射率（589 nm 处 n = 1.611–1.684）和高光学透明度（约 95%）。这为新一代光学材料的潜在应用提供了一条途径。