Refractive Indices of Silsesquioxanes with Various Structures
Refractive Indices of Silsesquioxanes with Various Structures
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DOI：
10.1007/s12633-014-9239-6
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发表时间：
2015-04-01
期刊：
影响因子：
3.4
通讯作者：
Unno, Masafumi
中科院分区：
文献类型：
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作者：
Endo, Hisayuki;Takeda, Nobuhiro;Unno, Masafumi
为了为高性能 LED 提供可靠的封装剂，倍半硅氧烷是最有前途的材料之一。然而，传统有机硅材料的折射率相对较低，需要改进。为了开发高折射率有机硅材料，我们研究了结构与折射率的关系。本文新合成了一系列具有各种结构（线性、环状、梯形和笼状）的烷基取代倍半硅氧烷，并研究了其光谱和光学性质。因此，由各自的硅烷醇制备直链和环状硅氧烷。由环状硅烷醇合成了两种新型三环梯型硅氧烷（具有确定结构的梯型倍半硅氧烷）。采用该方法还制备了具有相同取代基的笼型八硅倍半氧烷。鉴定了产物的结构并测量了它们的折射率。因此，环状硅氧烷的值略高于直链或单体硅氧烷。通过添加更多的环，折射率值增加。在我们研究的化合物中，包含 6,8,6 元环的三环梯硅氧烷显示出最高的折射率和阿贝数。
In order to provide reliable encapsulants for a high-performance LED, silsesquioxane is one of the most promising materials. However, the refractive indices of conventional silicone materials are relatively low and improvement is necessary. For the aim of developing silicone materials with high refractive index, we investigate the relationship of structures and refractive indices. In this paper, a series of alkyl-substituted silsesquioxanes with various structures (linear, cyclic, ladder, and cage) were newly synthesized and spectral and optical properties were investigated. Thus, linear and cyclic siloxanes were prepared from respective silanols. Two novel tricyclic laddersiloxanes (ladder-type silsesquioxanes with defined structure) were synthesized from cyclic silanols. Cage octasilsesquioxanes with the same substituents were also prepared by applying the new method. The structures of the products were identified and their refractive indices were measured. As a result, cyclic siloxanes showed slightly higher values than linear or monomeric siloxanes. By adding more rings, refractive index values increased. Among the compounds we investigated, a tricyclic laddersiloxane comprising 6,8,6-membered rings showed the highest refractive index and Abbe number.