B2O3/SiO2/Phenolic Resin Hybrid Materials Produced by Simultaneous Twin Polymerization of Spiromonomers. Issue 5 (15th January 2018)

• Record Type: Journal Article
• Authors: Weißhuhn, Julia; Seifert, Andreas; Dzhagan, Volodymyr; Palaniyappan, Saravanan; Zahn, Dietrich R. T.; Wagner, Guntram; Spange, Stefan
• Is Part Of: Macromolecular chemistry and physics. Volume 219:Issue 5(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-01-15
• Subjects: B2O3 -- borosilicate -- flame retardants -- hybrid materials -- SiO2 -- twin polymerization; Polymers -- Periodicals; Polymerization -- Periodicals; Synthetic products -- Periodicals; Macromolecules -- Periodicals; 547.7
• DOI: 10.1002/macp.201700487
• Languages: English
• ISSNs: 1022-1352

Abstract

Abstract: A synthetic procedure for boron oxide/silica/carbon polymer hybrid materials is presented, which does not need water as a reagent. For this purpose, the combined polymerization of the two twin monomers 2, 2′‐spirobi[4 H ‐1, 3, 2‐benzodioxasiline]1 and spiroboronate tetra‐ n ‐butylammonium bis( ortho ‐hydroxymethylphenolato)borate2 is successful to produce homogeneous hybrid materials by thermal treatment in the melt at 180 °C. The achieved hybrid material shows a ternary composition. It consists of silica, polyborate‐tetra( n ‐butyl)ammonium, and phenolic resin. The tetra( n ‐butyl)ammonium cation within the hybrid material, originating from monomer2, can be easily sacrificed by Hofmann degradation at 300 °C. Thereby, it serves as the proton source for the BOH moiety. This thermal treatment finally results in the formation of the boron oxide network. The reaction between both inorganic networks under the formation of SiOB bonds occurs at 450 °C in air atmosphere, which is proven with infrared spectroscopy. Oxidation and carbonization of the hybrid materials provide composite materials with a similar composition of C/B2 O3 /SiO2 . Their use as effective flame retardant materials is demonstrated. Abstract : A ternary organic–inorganic hybrid material consisting of silica, polyborate‐tetra( n ‐butyl)ammonium, and phenolic resin is prepared via simultaneous twin polymerization of the two twin monomers 2, 2′‐spirobi[4 H ‐1, 3, 2‐benzodioxasiline] and spiroboronate tetra‐ n ‐butylammonium bis( ortho ‐hydroxymethylphenolato)borate. The tetra( n ‐butyl)ammonium cation within the material can be sacrificed by Hofmann degradation at 300 °C to produce a boron oxide/silica/carbon polymer hybrid material.