Fast Curable Polysiloxane-Silphenylene Hybrimer with High Transparency and Refractive Index for Optical Applications

Abstract

In this study, a fast curable polysiloxane-silphenylene hybrimer (PSH) was synthesized by the nonhydrolytic sol–gel condensation of phenyl-vinyl-oligosiloxane (PVO) and tris(dimethylhydrosilyl)benzene (TDMSB) under a Pt catalyst to investigate its optical property and thermal stability. The combination of PVO and tripod-type TDMSB results in a hybrimer with a fast curing time of 30 min. The PSH exhibited a high refractive index of 1.60, 1.59, and 1.58 at 450, 520, and 635 nm, respectively. High transmittance of 97% at 450 nm was obtained. The PSH exhibited a very high transmittance of 97% before thermal aging. The high optical transmittance of the PSH was only slightly decreased by 0.5% of the transmittance at 180 °C for 72 h after thermal aging, and high transparency was maintained almost constant even after 72 h of high-temperature treatment.

High-Refractive-Index Polysiloxanes Containing Naphthyl and Phenanthrenyl Groups and Their Thermally Cross-Linked Resins

“…In general, it can be concluded that the obtained cured oligosiloxanes show very high thermal stabilities. Other siloxanes consisting mainly of phenyl and methyl groups show T 95 values between 340 and 460 °C, ,,, while the polysiloxanes containing polycyclic aromatic groups previously synthesized in our group showed values up to 370 °C …”

High Refractive Index, Enantiopure Silicones Based on BINOL

“…[ 15 ] Note that the inclusion of high RI constituents such as titania [ 16 ] or the use of densely reticulated materials can also lead to materials/composites with higher RI, up to about 1.6. [ 17,18 ]…”

“…[15] Note that the inclusion of high RI constituents such as titania [16] or the use of densely reticulated materials can also lead to materials/composites with higher RI, up to about 1.6. [17,18] There is also an interest in using optically pure monomers to create polymers and materials with high degrees of optical activity; [19,20] the polymers may contain the chiral elements in the backbone or be pendent to the chain. As a consequence of backbone rigidity, such polymers frequently adopt helical structures whose interconversion between left-and right-handed helices may be difficult or impossible as in the case with certain acrylates; in such cases very high optical rotations are observed.…”