Cycloaliphatic epoxy oligosiloxane-derived hybrid materials for a high-refractive index LED encapsulant

2011 ◽  
Vol 122 (4) ◽  
pp. 2478-2485 ◽  
Author(s):  
SeungCheol Yang ◽  
Joon-Soo Kim ◽  
JungHo Jin ◽  
Seung-Yeon Kwak ◽  
Byeong-Soo Bae
Keyword(s):  
Refractive Index ◽  
Hybrid Materials ◽  
High Refractive Index ◽  
Cycloaliphatic Epoxy

A facile method for fabrication of titanium-doped hybrid materials with high refractive index

RSC Advances ◽  
2014 ◽  
Vol 4 (27) ◽  
pp. 13909-13918 ◽  
Author(s):  
Xibing Zhan ◽  
Qingyu Xing ◽  
Huijuan Liu ◽  
Junying Zhang ◽  
Jue Cheng ◽  
...  
Keyword(s):  
Refractive Index ◽  
Hybrid Materials ◽  
Sol Gel ◽  
High Refractive Index ◽  
Sol Gel Process ◽  
Facile Route

This paper presents a facile route to prepare a series of high refractive index and homogeneous hybrid resins with titanium in the backbone by a non-hydrolytic sol–gel process.

In situ Synthesis of High Refractive Index PDMS/Metal Oxide Nanocomposites

2012 ◽  
Vol 1400 ◽  
Author(s):  
Qiaoyu Lu ◽  
Michael E. Mullins
Keyword(s):  
Refractive Index ◽  
Metal Oxide ◽  
Hybrid Materials ◽  
Sol Gel ◽  
Heat Stability ◽  
Ceramic Materials ◽  
High Refractive Index ◽  
Oxide Content ◽  
Metal Alkoxides ◽  
Silicone Polymers

ABSTRACTOrganic-inorganic hybrids have been prepared with tailorable and enhanced properties which are unachievable using polymers or ceramics alone. By combining the flexibility of polymers with the electronic and optical properties of ceramic materials, these hybrids offer great potential for many optical, electrical and mechanical applications. Silicone polymers because of their desirable surface properties, excellent physical properties, heat stability, and high resistance to chemical and UV attack, have been widely used. Hybrid siloxane-metal oxide gels have been prepared via sol-gel techniques, by using hydroxyl-terminated polydimethylsiloxanes (PDMS) crosslinked by metallic alkoxides, M(OR)n. In this technique, the use of organic solvents permits organic and inorganic components to be combined at a molecular level with the desired composition. By varying the type and percentage of metal alkoxides during synthesis, transparent and homogeneous organic-inorganic hybrid materials with unique properties were obtained. Also a secondary metal oxide species was introduced to synthesize binary metal oxide-PDMS hybrids. Systematic experiments were carried out to study the effect of the reaction conditions and metal alkoxides-PDMS ratios on the properties of the final hybrids. These hybrids were spin coating on silicon wafers or molded into bulk films to be tested. The composition and the properties of the transparent inorganic-organic hybrids were investigated and characterized by ellipsometer and Fourier Transform Infrared (FTIR) spectroscopy. Experimental results showed that the refractive index of the hybrid materials exhibits a proportional relationship with the metal oxide content, the higher the metal oxide content the higher the refractive index. The refractive index was increased from 1.4 of PDMS to 1.7 of metal oxide-PDMS hybrid with highest prepared metal oxide loading. From the FTIR spectra, the structures of the hybrids for various metal oxide-PDMS compositions were examined.

New Organic-Inorganic Hybrid Materials: High Refractive Index Polymers Based on Cyclotriphophazene with High Thermostability and Transparency

2021 ◽  
Author(s):  
Linxuan Fang ◽  
Caiyun Wang ◽  
Menglu Dai ◽  
Gang Huang ◽  
Jing Sun ◽  
...  
Keyword(s):  
Refractive Index ◽  
Hybrid Materials ◽  
High Refractive Index ◽  
Inorganic Hybrid ◽  
Ene Reaction ◽  
Aromatic Thiol ◽  
High Thermostability

Two flexible and colorless high refractive index films based on cyclotriphophazene have been successfully prepared by the thiol-ene reaction of hexa-substituted cyclotriphophazene monomer (CVP) and commercial bifunctional aromatic thiol. The...

Polarization Measurements of Molded Liquid Crystal Polymer/Titania Composites

2010 ◽  
Author(s):  
B. R. Dantal ◽  
A. Saigal ◽  
M. A. Zimmerman
Keyword(s):  
Refractive Index ◽  
Liquid Crystal ◽  
Dielectric Properties ◽  
Millimeter Wave ◽  
Hybrid Materials ◽  
Broad Band ◽  
High Refractive Index ◽  
Liquid Crystal Polymer ◽  
Frequency Range ◽  
Crystal Polymer

During the past decade, the preparation of inorganic/organic hybrid materials with high refractive index has attracted considerable attention. In particular, TiO2 (Titanium dioxide or Titania), as inorganic domains, have been incorporated into a polymer matrix to produce high refractive index hybrid materials [1–3]. Polarization of injection molded liquid crystal polymer/Titania composite parts have been investigated in the broad band millimeter wave frequency range. The measurements have been performed by using two different spectroscopy techniques. First, free space quasi optical millimeter wave spectrometer, equipped with a high power source coherent radiation tunable in the 40–90 GHz frequency range is used. Second, low power dispersive Fourier transform spectrometer has been used for higher frequencies in the range of 100–600 GHz. Dielectric properties of liquid crystal polymer/Titania composites have been determined in the broad band millimeter wave frequency range. A correlation between dielectric properties and dispersed Titania weight percent has been observed using the two spectroscopy techniques. It is found that the absorption coefficient and loss tangent is a strong function of the output power of the sources of the incident radiation. On the other hand, refractive index and real permittivity values measured from both spectroscopy techniques are similar. In addition, it has been found that transmittance level and absorption losses depend on the orientation of the samples with respect to the orientation of electric and magnetic fields in the incident electro-magnetic wave. Finally, the polarization of the parts varies with the direction of flow of the molten plastic into the cavity.

Preparation and properties of high refractive index ZrO2 nano-hybrid materials

2020 ◽  
Vol 261 ◽  
pp. 126878 ◽  
Author(s):  
Bolong Yao ◽  
Xucan Hu ◽  
Jiacheng Liu ◽  
Kun Chen ◽  
Jing Liu
Keyword(s):  
Refractive Index ◽  
Hybrid Materials ◽  
High Refractive Index

New high-refractive-index organic/inorganic hybrid materials from sol-gel processing

1991 ◽  
Vol 24 (11) ◽  
pp. 3449-3450 ◽  
Author(s):  
B. Wang ◽  
G. L. Wilkes ◽  
J. C. Hedrick ◽  
S. C. Liptak ◽  
J. E. McGrath
Keyword(s):  
Refractive Index ◽  
Hybrid Materials ◽  
Sol Gel ◽  
High Refractive Index ◽  
Inorganic Hybrid ◽  
Gel Processing

Accelerated Discovery of High-Refractive-Index Polyimides via First-Principles Molecular Modeling, Virtual High-Throughput Screening, and Data Mining

2019 ◽  
Author(s):  
Mohammad Atif Faiz Afzal ◽  
Mojtaba Haghighatlari ◽  
Sai Prasad Ganesh ◽  
Chong Cheng ◽  
Johannes Hachmann
Keyword(s):  
Data Mining ◽  
Refractive Index ◽  
High Throughput ◽  
First Principles ◽  
High Throughput Screening ◽  
Large Scale ◽  
Computational Study ◽  
High Refractive Index ◽  
Structural Features ◽  
Learning Program

<div>We present a high-throughput computational study to identify novel polyimides (PIs) with exceptional refractive index (RI) values for use as optic or optoelectronic materials. Our study utilizes an RI prediction protocol based on a combination of first-principles and data modeling developed in previous work, which we employ on a large-scale PI candidate library generated with the ChemLG code. We deploy the virtual screening software ChemHTPS to automate the assessment of this extensive pool of PI structures in order to determine the performance potential of each candidate. This rapid and efficient approach yields a number of highly promising leads compounds. Using the data mining and machine learning program package ChemML, we analyze the top candidates with respect to prevalent structural features and feature combinations that distinguish them from less promising ones. In particular, we explore the utility of various strategies that introduce highly polarizable moieties into the PI backbone to increase its RI yield. The derived insights provide a foundation for rational and targeted design that goes beyond traditional trial-and-error searches.</div>

Sign in / Sign up

Export Citation Format

Share Document