Refractive index tuning of highly transparent bismuth containing polymer composites

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• 作者：J. Fritsch^a ; ^{Julia.Fritsch@chemie.tu-dresden.de"" rel=""nofollow} ; D. Mansfeld^a ; ^b ; ^{Dirk.Mansfeld@chemie.tu-dresden.de"" rel=""nofollow} ; M. Mehring^b ; ^{michael.mehring@chemie.tu-chemnitz.de"" rel=""nofollow} ; R. Wursche^c ; ^{roland.wursche@evonik.com"" rel=""nofollow} ; J. Grothe^a ; ^{Julia.Grothe@chemie.tu-dresden.de"" rel=""nofollow} ; S. Kaskel^a ; ^{Stefan.Kaskel@chemie.tu-dresden.de"" rel=""nofollow}
• 关键词：Bifunctional monomers ; Refractive index ; Photo polymerization
• 刊名：Polymer
• 出版年：2011
• 出版时间：7 July 2011
• 年：2011
• 卷：52
• 期：15
• 页码：3263-3268
• 全文大小：605 K

文摘

A new method for the preparation of transparent bismuth containing composites is reported. With the organic ligands 2,3-Dihydroxypropylmethacrylate (HMA) and 2-(Methacryloyloxy)-ethylacetoacetate (AcMA), bifunctional monomers with a functional group for metal complexation on the one hand and a reactive group for polymerization on the other hand were found. By integrating up to 20 wt- % bismuth in the monomer mixtures, an increase of the refractive index of 4.0 % (∆n = 0.058) is determined. The metal complexation was observed via infrared spectroscopy (AcMA) and NMR spectroscopy (HMA). Subsequent addition of trimethylolpropane triacrylate (TMPTA) as cross-linking agent and 2,4,6-trimethyl-benzoyldiphenylphosphine oxide (TPO) as photoinitiator to the bismuth containing monomers Bi-HMA and Bi-AcMA lead to a UV-curable liquid. Photoinduced polymerization was used to generate transparent bismuth containing hybrid materials with increased refractive index. The polymers were characterized by UV/VIS spectroscopy, ellipsometry and DTA/TG. The materials show a high transmission (>80 % in 2 mm thick plates) in the visible spectral range, and an increased refractive index with increasing bismuth content.