Reactions of Zirconium (IV) n‐Propoxide with SiH‐Functional Polysiloxanes as a Route to Siloxane–Zirconium Hybrid Materials with Enhanced Refractive Index,Macromolecular Rapid Communications

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Reactions of Zirconium (IV) n‐Propoxide with SiH‐Functional Polysiloxanes as a Route to Siloxane–Zirconium Hybrid Materials with Enhanced Refractive Index
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2020-12-03 , DOI: 10.1002/marc.202000601
Slawomir Rubinsztajn ₁ , Julian Chojnowski ₁ , Urszula Mizerska ₁ , Malgorzata Basko ₁ , Pawel Uznanski ₁ , Agnieszka Walkiewicz-Pietrzykowska ₁ , Marek Cypryk ₁

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The reaction of poly(hydromethylsiloxane‐co‐methylphenylsiloxane) with zirconium (IV) n‐propoxide in dry toluene leads to extensive scission of the siloxane chain and conversion of Si‐H groups. These processes produce oligomeric siloxanes and organosilanes containing moisture sensitive propoxy and siloxy‐zirconate groups. The obtained post‐reaction solution of zirconium containing heterosiloxane oligomers is stable under anhydrous conditions for several weeks. However, its exposure to moisture initiates the hydrolytic condensation of the reactive groups leading to cross‐linking and the formation of a siloxane–zirconium composite. Spin coating of the siloxane–zirconium prepolymer followed by exposure to moisture produces thin films with excellent light transparency and increased refractive index. The final coatings are characterized by ellipsometry, UV–Vis, IR, and ²⁹Si MAS NMR spectroscopies.

中文翻译：

正丙酸锆（IV）与SiH-官能聚硅氧烷的反应，是制备折射率提高的硅氧烷-锆杂化材料的途径

聚（氢甲基硅氧烷-共-甲基苯基硅氧烷）与锆（IV）n的反应干甲苯中的丙醇盐会导致硅氧烷链的大量断裂和Si-H基团的转化。这些过程产生了含有对湿气敏感的丙氧基和硅氧基锆酸酯基团的低聚硅氧烷和有机硅烷。所获得的含锆杂硅氧烷低聚物的反应后溶液在无水条件下稳定数周。但是，它暴露在湿气中会引发反应性基团的水解缩合，从而导致交联并形成硅氧烷-锆复合材料。旋涂硅氧烷-锆预聚物，然后暴露于湿气中，可制得具有出色的透光性和增加的折射率的薄膜。最终涂层的特征是椭圆偏振，UV-Vis，IR和²⁹ Si MAS NMR光谱学。

更新日期：2020-12-03

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