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

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Sacha Legrand ◽  
Ari Kärkkäinen
Keyword(s):  
Refractive Index ◽  
Diffuse Reflectance ◽  
Gel Permeation Chromatography ◽  
2D Nmr ◽  
High Refractive Index ◽  
Diffuse Reflectance Infrared Spectroscopy ◽  
Gel Permeation ◽  
One Step ◽  
Diffuse Reflectance Infrared ◽  
Very High

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.

Characterization of hydroxylated hyperbranched polyesters of fourth and fifth generation

e-Polymers ◽  
2010 ◽  
Vol 10 (1) ◽  
Author(s):  
Edwin A. Murillo ◽  
Pedro P. Vallejo ◽  
Betty L. López
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Refractive Index ◽  
Light Scattering ◽  
Magnetic Resonance ◽  
Dynamic Light Scattering ◽  
Gel Permeation Chromatography ◽  
Vapor Pressure Osmometry ◽  
Fifth Generation ◽  
Gel Permeation ◽  
One Step

AbstractHydroxylated hyperbranched polyester (HBPs) of fourth and fifth generation were obtained by three methods; one step (HBP4, HBP5), step by step (HBP4P, HBP5P) and combinations of one step and step by step (HBP1-4, HBP1- 5). The HBPs were synthesized in bulk from 2,2-bis(hydroxymethyl)propionic acid (DMPA) and pentaerythritol (PE) using acid catalysis (p-toluenesulfonic acid) and characterized by infrared analysis, 1H and 13C nuclear magnetic resonance, gel permeation chromatography, vapor pressure osmometry, electro spray ionizationmass spectrometry, dynamic light scattering, refractive index, thermogravimetric and differential scanning calorimetric analysis. The refractive index of HBPs were low, the infrared and nuclear magnetic resonance analysis showed evidence of the occurrence of reaction between from 2,2-bis(hydroxymethyl) propionic acid (DMPA) and pentaerythritol (PE). The molar mass values of the HBPs determined by gel permeation chromatography were different to vapor pressure osmometry measurements due to small hydrodynamic volume of the HBPs. The mass spectrometry analysis showed different acyclic and cyclic units in the HBPs. The distributions of HBPs studied by dynamic light scattering were monomodal in number and volume and bimodal in intensity. The thermal stability of the fifth generation HBPs was higher than that the fourth generation. All HBPs presented amorphous behavior

A Critical Evaluation of Three Types of Diffuse Reflectance Infrared Accessories

1986 ◽  
Vol 40 (7) ◽  
pp. 974-978 ◽  
Author(s):  
Paul W. Yang ◽  
Henry H. Mantsch ◽  
Fred Baudais
Keyword(s):  
Refractive Index ◽  
Diffuse Reflectance ◽  
Critical Evaluation ◽  
High Refractive Index ◽  
Polarization Characteristics ◽  
Diffuse Reflectance Infrared ◽  
Specular Component

Three geometrically different diffuse reflectance accessories were compared in terms of the throughput and ease of operation. The capability to discriminate the specular component against the diffuse reflectance component was investigated by the use of high refractive index samples. It was found that in all three accessories the specular as well as the diffuse reflectance components have similar reflection and polarization characteristics and that the specular component is primarily sample-dependent rather than accessory-dependent.

Figures of Merit for a Diffuse Reflectance Accessory Using an On-Axis Ellipsoidal Collecting Mirror

1988 ◽  
Vol 42 (3) ◽  
pp. 428-433 ◽  
Author(s):  
E. H. Korte
Keyword(s):  
Infrared Spectroscopy ◽  
Noise Level ◽  
Diffuse Reflectance ◽  
Field Of View ◽  
Figures Of Merit ◽  
Size Dependent ◽  
Diffuse Reflectance Infrared Spectroscopy ◽  
Diffuse Reflectance Infrared

The attainable efficiency of an accessory for diffuse reflectance infrared spectroscopy where both the irradiation and detection optics are located on the same side of the sample is analyzed, the size-dependent noise level of the detector being taken into account. The resulting figures of merit are found to reach up to more than 0.3, when standard detectors of 60° field-of-view are considered.

scholarly journals Scalable High Refractive Index polystyrene-sulfur nanocomposites via in situ inverse vulcanization

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Vijay S. Wadi ◽  
Kishore K. Jena ◽  
Kevin Halique ◽  
Brigita Rožič ◽  
Luka Cmok ◽  
...  
Keyword(s):  
Refractive Index ◽  
Low Cost ◽  
High Refractive Index ◽  
Extrusion Process ◽  
Melt Processing ◽  
Process Formation ◽  
Polystyrene Matrix ◽  
One Step ◽  
Extrusion Method

Abstract In this work, we demostrate the preparation of low cost High Refractive Index polystyrene-sulfur nanocomposites in one step by combining inverse vulcanization and melt extrusion method. Poly(sulfur-1,3-diisopropenylbenzene) (PS-SD) copolymer nanoparticles (5 to 10 wt%) were generated in the polystyrene matrix via in situ inverse vulcanization reaction during extrusion process. Formation of SD copolymer was confirmed by FTIR and Raman spectroscopy. SEM and TEM further confirms the presence of homogeneously dispersed SD nanoparticles in the size range of 5 nm. Thermal and mechanical properties of these nanocomposites are comparable with the pristine polystyrene. The transparent nanocomposites exhibits High Refractive Index n = 1.673 at 402.9 nm and Abbe’y number ~ 30 at 10 wt% of sulfur loading. The nanocomposites can be easily processed into mold, films and thin films by melt processing as well as solution casting techniques. Moreover, this one step preparation method is scalable and can be extend to the other polymers.

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