1,3-Dimethyl-tetrakis(2-triphenylsilylethyl)dimethyldisiloxane: a new carbosilane for the preparation of high-refractive-index films

Abstract

A new carbosilane has been synthesised in one step by hydrosilylation of 1,3-dimethyl-tetravinyldisiloxane with triphenyl silane. The new carbosilane has been characterized by 1D and 2D NMR, MS, and Gel Permeation Chromatography (GPC). The new carbosilane has been spin-coated on silicon wafers to prepare a film with very high refractive index (μ = 1.520) and excellent hydrophobicity. The film has also been analysed by Diffuse Reflectance Infrared Spectroscopy (DRIFT). The preparation of the new carbosilane does not generate waste, and its application can be easily scaled-up. Consequently, the new precursor is likely to be very useful for industrial optoelectronic applications.

P‐136: Late‐News Poster: Functional Hard Coatings for Foldable Displays

“…Plastics without a hard coating have a poor abrasion resistance as can be seen from the Figure 3 whereas the FleXFOLD+ side remains unscratched. The photograph of the water contact angle measurement is illustrated in Figure 4, [5] where the coated side is hydrophobic, and the un-coated PET is not. Another function of this two-layer stack is the reduction of frictional effects for materials sliding in contact with the coated plastic surface, providing a nice touch feel to the display surface.…”

New Phenanthrenyl‐Substituted Hybrid Organic‐Inorganic Polysiloxanes for Optoelectronic Applications

“…[6] By increasing the amount of phenyl side groups, the viscosity and RI usually raise. [2,7,8] Thus, a polysiloxane with phenoxyphenyl side-groups with RI of 1.62 and transmittance of 97-99 % has been reported by Mosley. [9] The introduction of cyclic aromatic groups such as biphenyl and naphthyl groups has been used for ion sensing and gas chromatography applications.…”

“…Increasing the amount of crosslinking fosters the hardness and viscosity of polysiloxanes, and consequently decreases the moisture absorption. [18] Thus, the monomer 1 has been fruitfully employed with other silane precursors including phenyltrimethoxysilane (2), triethoxysilane (3), 1-(phenyl)-1,1,4,4,4-pentamethoxy-1,4-disilabutane (4), methyltriethoxysilane (5) and (phenanthren-9-yl)triethoxysilane (6) (Figure 1) for the preparation of anti-reflective coatings. [19,20] In combination with (phenanthren-9-yl)triethoxysilane ( 6), the silane 1 has also been proved to be a very important synthon for the synthesis of inorganic-nanoparticle-containing polysiloxanes and silsesquioxanes used in the production of semiconductor optoelectronics.…”

“…Hybrid organic-inorganic polysiloxanes and polycarbosilanes have become a very important class of materials due to their unique properties for many optical applications, such as electrical memories, solar cells, [1] antireflection coatings, precursors for the preparation of high-refractive-index (HRI) films or light-emitting diode (LED) packaging. [2,3] Especially, their optical and mechanical properties, such as high-optical transparency in the visible range, high transmittance and refractive index, chemical inertness, high-thermal stability, and easy processability makes them ideal materials for the manufacturing of optoelectronic devices. [4] Therefore, a wide range of polysiloxanes and polycarbosiloxanes with high RI can be found in the literature.…”

“…[16] One approach to synthesize polysiloxanes with high RI consists of the incorporation of substituents with high-molar refractivities and low-molecular volumes, such as halogen atoms (except fluorine), C=C or C�C bonds, or aromatic rings. [17] As a result, aromatic-containing silane and carbosilane precursors such as 1,3-dimethyl-tetrakis(2-triphenylsilylethyl)dimethyldisiloxane, [2] 1-(2-(triethoxysilyl)ethyl)triphenylsilane, 9phenanthrenylmethyldimethoxysilane, or 9phenanthrenyltriethoxysilane have been developed for the manufacturing of highly valuable optoelectronic devices. [8] The aromatic disilane 1-(9-phenanthrenyl)-1,1,4,4,4-pentamethoxy-1,4-disilabutane (1) is of particular interest since it possesses six hydrolysable methoxy groups in its backbone and gives the possibility to prepare highly crosslinked polysiloxanes.…”