Preparation and properties of bisphenol-F based boron-phenolic resin/modified silicon nitride composites and their usage as binders for grinding wheels

Lin, Cheng‐Hsiung; Lee, Hsun-Tsing; Chen, Jem-Kun

doi:10.1016/j.apsusc.2014.12.193

Cited by 39 publications

(15 citation statements)

References 28 publications

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“…The spectra assignments of the PF resins are shown in Table 2 [15][16][17]. PF resin may be the main factor altering its contact angle change rate.…”

Section: Ft-ir Spectroscopymentioning

confidence: 99%

Synthesis and Mechanism of Metal-Mediated Polymerization of Phenolic Resins

Zhao

Zhang

et al. 2016

Polymers

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Phenol-formaldehyde (PF) resin is a high performance adhesive, but has not been widely developed due to its slow curing rate and high curing temperature. To accelerate the curing rate and to lower the curing temperature of PF resin, four types of metal-mediated catalysts were employed in the synthesis of PF resin; namely, barium hydroxide (Ba(OH) 2 ), sodium carbonate (Na 2 CO 3 ), lithium hydroxide (LiOH), and zinc acetate ((CH 3 COO) 2 Zn). The cure-acceleration effects of these catalysts on the properties of PF resins were measured, and the chemical structures of the PF resins accelerated with the catalysts were investigated by using Fourier transform infrared (FT-IR) spectroscopy and quantitative liquid carbon-13 nuclear magnetic resonance ( 13 C NMR). The results showed that the accelerated efficiency of these catalysts to PF resin could be ordered in the following sequence: Na 2 CO 3 > (CH 3 COO) 2 Zn > Ba(OH) 2 > LiOH. The catalysts (CH 3 COO) 2 Zn and Na 2 CO 3 increased the reaction activity of the phenol ortho position and the condensation reaction of ortho methylol. The accelerating mechanism of (CH 3 COO) 2 Zn on PF resin is probably different from that of Na 2 CO 3 , which can be confirmed by the differences in the differential thermogravimetric (DTG) curve and thermogravimetric (TG) data. Compared to the Na 2 CO 3 -accelerated PF resin, the (CH 3 COO) 2 Zn-accelerated PF resin showed different peaks in the DTG curve and higher weight residues. In the synthesis process, the catalyst (CH 3 COO) 2 Zn may form chelating compounds (containing a metal-ligand bond), which can promote the linkage of formaldehyde to the phenolic hydroxyl ortho position.

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“…The spectra assignments of the PF resins are shown in Table 2 [15][16][17]. PF resin may be the main factor altering its contact angle change rate.…”

Section: Ft-ir Spectroscopymentioning

confidence: 99%

Synthesis and Mechanism of Metal-Mediated Polymerization of Phenolic Resins

Zhao

Zhang

et al. 2016

Polymers

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“…Notably, the B-containing PR exhibits a new strong absorption peak at about 1455 cm −1 , which is attributed to the characteristic peak of the B-O bond compared with that of common PR, indicating successful incorporation of the B element by the current simple method [13,27]. In addition, there are two characteristic peaks of para-substituted and ortho-substituted of benzene for common PR at about 812 and 756 cm −1 , while the characteristic peak at 812 cm −1 is weakened significantly (almost disappeared), suggesting the high ortho-substituted characteristic of the as-prepared B-containing PR [29][30][31].…”

Section: Structure Of Common Pr and B-containing Prmentioning

confidence: 82%

Strong Effect of Process Parameters on the Properties of Boron-Containing Phenolic Resins with High Char Yield

Sun

2020

Applied Sciences

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This work is focused on the optimization of critical process parameters for preparation of boron-containing phenolic resin (B-containing PR), including the molar ratios of formaldehyde/phenol and potassium borate/phenol, reaction time; and measurement of surface tension of B-containing PR solution and wettability between B-containing PR solution and carbon fibers. The effects of the formaldehyde/phenol and potassium borate/phenol molar ratios on the char yield of the B-containing PR was studied. The highest char yield of B-containing PR could be as high as 71% under optimal conditions (molar ratios of formaldehyde/phenol = 1.8 and potassium borate/phenol = 0.2, and reaction time = 13 h). The effect of concentration and tested temperature on the surface tension of B-containing PR solution was investigated, and the wettability between B-containing PR solution and carbon fibers was evaluated for the first time, providing useful theory and experimental data for the preparation of B-containing PR-based composites.

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“…Спектр 13 С ЯМР (CD3OD), δC, м.д. : 116,11 (С 2,3,5,6 ); 150,20 (С 1,4 ). ИК спектр, ν, см -1 : 756; 831; 1211; 1367; 1471; 1515; 1597; 3000-3600.…”

Section: экспериментальная частьunclassified

“…Спектр 1 Н ЯМР (CD3OD), δН, м.д. : 3,84 с (2Н, СН2); 6,65 с (2Н, Н 3,6 ); 6,79 м (3Н, H 2',4',6' ); 7,15 т (2Н, H 3',5' ). Спектр 13 С ЯМР (CD3OD), δС, м.д.…”

Section: экспериментальная частьunclassified

“…Фенолформальдегидные смолы в основном используются в армированных термореактивных материалах. Фенольные смолы обладают различными свойствами, такими как термическая стабильность, огнестойкость, электроизоляция и механическая прочность [1][2][3]. Они широко используются в качестве абляционных материалов, огнеупоров, пеноматериалов и фрикционных материалов.…”

Section: Introductionunclassified

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Synthesis and Properties of Boron-Containing Oligomers Based on Hydroquinone and Boric Acid

Lenskiy¹,

Novitskiy²,

Корабельников³

et al. 2020

IVKKT

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By polyesterification of boric acid with hydroquinone in o-xylene with azeotropic distillation of water, polyesters of hydroquinone and boric acid are obtained. By adding equimolar amounts of phenol to the reaction between boric acid and hydroquinone, a mixed polyester of hydroquinone, phenol and boric acid is obtained. From the ratio of the integral intensity of phenol protons to hydroquinone protons, it was found that the addition of phenol to the hydroquinone polydiester and boric acid occurs by 80%. The synthesized polyesters reacted with formaldehyde using o-xylene as a solvent and a boron trifluoride etherate catalyst. By the method of end groups it was determined that all the compounds obtained have a small molecular weight and belong to the class of oligomers. The structure of the synthesized oligomers was confirmed by elemental analysis, IR and NMR (1H, 13C) spectroscopy. All compounds obtained have a good adhesion to glass, wood and metal. The thermal destruction of samples in a flow of nitrogen at 900 °C was studied, the residual mass for polyesters is from 49 to 53%, for polymethylene ester - from 18.5 to 31%. The residual mass during thermo-oxidative degradation in an air flow at 600 ° C for polyesters is from 62 to 65%, for polymethylene ester from 37 to 44%. The reaction of the modification of synthesized oligomers with a sulfur curing system and epoxy resin was studied. The maximum content of insoluble gel fraction when cured by sulfuric system at a temperature of 220 °C reaches 94% for polymethylene diester hydroquinone and boric acid, the minimum is 68% for the polytriester of hydroquinone and boric acid. The maximum content of insoluble gel fraction when cured with epoxy resin at a temperature of 150 °C for polyesters is in the range 52 - 66 %, for polymethylene ester 50 - 61%.

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Preparation and properties of bisphenol-F based boron-phenolic resin/modified silicon nitride composites and their usage as binders for grinding wheels

Cited by 39 publications

References 28 publications

Synthesis and Mechanism of Metal-Mediated Polymerization of Phenolic Resins

Synthesis and Mechanism of Metal-Mediated Polymerization of Phenolic Resins

Strong Effect of Process Parameters on the Properties of Boron-Containing Phenolic Resins with High Char Yield

Synthesis and Properties of Boron-Containing Oligomers Based on Hydroquinone and Boric Acid

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