Tunable charge transfer effect in poly(spirobifluorene)s with different electron-rich side chains

Wang, Xuchao; Zhao, Lei; Shao, Shiyang; Ding, Junqiao; Jing, Xiabin

doi:10.1039/c4py00698d

Cited by 37 publications

(49 citation statements)

References 44 publications

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“…4a, the presence of phenylboronate structures is confirmed by the absorbance peak at 1350 cm −1 due to the B-O-C stretching vibration, as well as the characteristic band of B-C stretching vibration at 680 cm −1 [33]. The absorption peak at 1454 cm −1 is ascribable to the B-O stretching vibration.…”

Section: Structures Of the Cured Pbbzsmentioning

confidence: 52%

An investigation on the effect of phenylboronic acid on the processibilities and thermal properties of bis-benzoxazine resins

Wang

Jia

Liu

et al. 2015

Reactive and Functional Polymers

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Section: Structures Of the Cured Pbbzsmentioning

confidence: 52%

An investigation on the effect of phenylboronic acid on the processibilities and thermal properties of bis-benzoxazine resins

Wang

Jia

Liu

et al. 2015

Reactive and Functional Polymers

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“…In case of complete incineration, this process should remove all of the organic material by oxidation and deliver composite materials that only consist of inorganic oxides. However, black materials were received after the oxidation process because B 2 O 3 acts as oxidation inhibitor as known from literature . The boron oxide component forms a layer on the carbon surface and protects the underlying material against oxygen .…”

Section: Resultsmentioning

confidence: 99%

B₂O₃/SiO₂/Phenolic Resin Hybrid Materials Produced by Simultaneous Twin Polymerization of Spiromonomers

Weißhuhn

Seifert

Dzhagan

et al. 2018

Macro Chemistry & Physics

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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[4H‐1,3,2‐benzodioxasiline] 1 and spiroboronate tetra‐n‐butylammonium bis(ortho‐hydroxymethylphenolato)borate 2 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 monomer 2, 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/B2O3/SiO2. Their use as effective flame retardant materials is demonstrated.

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“…It is seen that, when the samples were thermally treated at 400, 500, and 800 C, the Bragg reflections appear at 2θ of 28.1 (Fig. 9C, 9D, and 9E), which are identified as crystalline diffraction peaks from B 2 O 3 [32] . When the thermal treatment temperature is below 300 C, the crystalline diffraction peak of B 2 O 3 does not appear, indicating that the carborane cage has not reacted with oxygen yet.…”

Section: Structure Variation Of P2 At Elevated Temperatures Under Airmentioning

confidence: 90%

“…Furthermore, P2 loses its weight much slower under air than under nitrogen and the ultimate char yield at 900 C is as high as 92.9%. Weight gain took place after 685 C under air, which may be associated with the fact that carborane cage could absorb oxygen and be oxidized to form boron oxide (B 2 O 3 ) at high temperatures under air [32] . On the other hand, protons generated from B-H bonds on carborane structure at high temperatures could be combined with free radicals delivered by the decomposition of phenolic resin so that the decomposition process could be postponed to a certain extent [26] .…”

Section: Thermal Stability Of P1 and P2mentioning

confidence: 99%

Synthesis and characterization of carborane bisphenol resol phenolic resins with ultrahigh char yield

Han

Wang

et al. 2015

Chin J Polym Sci

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Two carborane-containing resol phenolic resins (P1 and P2) with high boron content were synthesized via the reaction of carborane bisphenols (1 and 2) with formaldehyde in the presence of alkaline. HRMS results indicate that P1 is mainly composed of hydroxymethylated o-carborane bisphenols, the M w of which was restrained around 500 due to the strong steric hindrance of o-carborane bisphenol. In contrast, the molecular weight of P2 was well regulated under various reaction conditions. The obtained resins were characterized with spectroscopic techniques including FTIR, 1 H-NMR, 13 C-NMR, and 11 B-NMR, which gave satisfactory results. TGA studies show that P2 shows char yield of 88.9% and 92.9% at 900 C under nitrogen and air respectively. The imported carborane cage endows phenolic resin with ultrahigh char yield. Particularly, the char yield of the obtained carborane-containing phenolic resin under air is higher than that under nitrogen. FTIR and XRD confirm that the carborane cage could react with oxygen to form B 2 O 3 at elevated temperatures, which postpones the thermal decomposition of phenolic resin and accounts for the high char yield.

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Tunable charge transfer effect in poly(spirobifluorene)s with different electron-rich side chains

Cited by 37 publications

References 44 publications

An investigation on the effect of phenylboronic acid on the processibilities and thermal properties of bis-benzoxazine resins

An investigation on the effect of phenylboronic acid on the processibilities and thermal properties of bis-benzoxazine resins

B₂O₃/SiO₂/Phenolic Resin Hybrid Materials Produced by Simultaneous Twin Polymerization of Spiromonomers

Synthesis and characterization of carborane bisphenol resol phenolic resins with ultrahigh char yield

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Tunable charge transfer effect in poly(spirobifluorene)s with different electron-rich side chains

Cited by 37 publications

References 44 publications

An investigation on the effect of phenylboronic acid on the processibilities and thermal properties of bis-benzoxazine resins

An investigation on the effect of phenylboronic acid on the processibilities and thermal properties of bis-benzoxazine resins

B2O3/SiO2/Phenolic Resin Hybrid Materials Produced by Simultaneous Twin Polymerization of Spiromonomers

Synthesis and characterization of carborane bisphenol resol phenolic resins with ultrahigh char yield

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Product

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B₂O₃/SiO₂/Phenolic Resin Hybrid Materials Produced by Simultaneous Twin Polymerization of Spiromonomers