High Refractive-Index Hybrids Consisting of Water-Soluble Matrices with Bipyridine-Modified Polyhedral Oligomeric Silsesquioxane and Lanthanoid Cations

Polymers
Kazunari UedaYoshiki Chujo

Abstract

We report high refractive-index (RI) films composed of polyhedral oligomeric silsesquioxane (SSQ) matrices and various lanthanoid cations. The SSQ matrices were constructed from octaammonium SSQ by connecting with bipyridine dicarboxylic acid, which is expected to capture cations. By modulating the feed ratio between SSQ and dicarboxylic acid, the series of the SSQ matrices were obtained with variable cross-linking ratios among the SSQ units. Thin transparent films were able to be prepared through the drop-casting method with the aqueous mixtures containing SSQ matrices and various kinds of lanthanoid salts up to 40 wt %. From RI measurements, it was revealed that the increase of the amount of the metal ion can significantly lift up the RI values. In particular, critical losses of Abbe numbers, which theoretically have the trade-off relationship toward increases in RI values, were hardly detected. This effect could be obtained by cation assembly in local spots that are assisted by SSQ.

References

Feb 2, 2009·Advanced Materials·Luís D CarlosSidney J L Ribeiro
Jul 11, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Petr A LedinVladimir V Tsukruk
Feb 12, 2015·ACS Applied Materials & Interfaces·Petr A LedinVladimir V Tsukruk
Apr 12, 2015·Bioorganic & Medicinal Chemistry Letters·Jong-Hwan JeonYoshiki Chujo
Apr 17, 2017·Waste Management·Shengen ZhangChein-Chi Chang

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Methods Mentioned

BETA
NMR
scanning electron microscopy

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