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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
Author(s) -
Rubinsztajn Slawomir,
Chojnowski Julian,
Mizerska Urszula,
Basko Malgorzata,
Uznanski Pawel,
WalkiewiczPietrzykowska Agnieszka,
Cypryk Marek
Publication year - 2021
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.202000601
Subject(s) - siloxane , zirconium , materials science , polymer chemistry , prepolymer , chemical engineering , polymer , composite material , polyurethane , metallurgy , engineering
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 29 Si MAS NMR spectroscopies.