Sol-gel synthesis and physicochemical properties of organosilicon materials functionalized by amino groups

Неудачина, Л. К.; Лакиза, Н. В.; Пестов, А. В.; Osipova, V. A.; Adamova, L. V.; Горбунова, Е. М.

doi:10.1134/s1087659611050087

Cited by 7 publications

(4 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Butírico). Nos espectros de POSS observou-se claramente uma banda característica das ligações Si-O-Si na região de 1090 cm −1 [25], entre 3000 cm −1 e 2800 cm −1 , ocorre o estiramento axial CH 3 e CH. O sinal em 1715 cm −1 , no espectro deácido butírico, refere-seà presença da ligação C=O, o qual pode ser observado no POSS-modificado, deslocado para 1650 cm −1 .…”

Section: Resultsunclassified

Chemical modification of hybrid nanostructures (POSS) for application as lubricant

Luvison¹,

Farias²,

Bianchi³

2014

Sci. cum Ind.

View full text Add to dashboard Cite

Poliedros oligoméricos silsesquioxanos (POSS) são estruturas híbridas tipo (RSiO1,5)n com n grupos orgânicos R. Estas moléculas podem ser facilmente funcionalizadas, simplesmente alterando a constituição química dos grupos orgânicos. Nesse trabalho, a modificação química de POSS-NH2 foi feita por meio de reações de amidação comácido butírico em elevada temperatura, 160 o C. A formação do novo grupo amidaé evidenciada pelo do surgimento da banda de deformação angular do NH em 1540 cm −1 nos espectros de FTIR. Aproximadamente 40% dos grupos aminos reagiram, conforme resultados de titulação. A formação dos grupos amidas resultou no deslocamento da temperatura de transição vítrea (Tg) de-36,9 o C para-25,6 o C para o POSS-modificado. Ambas as amostras, de POSS-NH2 e POSS-modificado, exibem padrão de degradação térmica semelhante. A análise da função de distribuição de pares (PDF) determinou que as nanopartículas híbridas são separadas por uma distância periódica de aproximadamente 1,32 nm. O POSS-NH2 e o POSS-modificado apresentam comportamento newtoniano, na faixa que vai de 10 −1 s −1 até 1000 s −1. A viscosidade diminuiu com aumento da temperatura, um comportamento típico de lubrificantes líquidos.

show abstract

Section: Resultsunclassified

Chemical modification of hybrid nanostructures (POSS) for application as lubricant

Luvison¹,

Farias²,

Bianchi³

2014

Sci. cum Ind.

View full text Add to dashboard Cite

show abstract

“…Thermal characteristics of the complexes, which make it possible to obtain finely dispersed mixed oxide and metal powders at relatively low temperatures, are of considerable interest [3][4][5][6]. For practical application, spectral and other fundamental physical and chemical characteristics of substances are important [7,8], in particular, thermochromism, which is described in detail in the works [9][10][11][12]. In the previously studied group of hexa(thiocyanate-N)chromates (III) of rare-earth metal complexes with some nitrogen-and sulfur-containing neutral organic ligands, the reversible thermosensitive properties with multiple repetition of heating-cooling cycles were detected [13].…”

Section: Introductionmentioning

confidence: 99%

Chromium-Lanthanide Multi-Ligand Complexes as Precursors of New Materials

Cherkasova

2022

SSP

View full text Add to dashboard Cite

Thermochromic properties were found in bimetallic hybrid inorganic-organic complex compounds of hexa (thiocyanate-N) chromates (III) of IIIb-group rare-earth metals and lanthanides complexes with dimethylsulfoxide [M(C2H6SO)8]L, dimethylformamide [M (C3H7NO)8]L, ε-caprolactam [M(εC6H11NO)8]L and nicotinic acid [M(C5H5NCOO)3(H2O)2]L·nH2O, n=1,2, L=[Cr (NCS)6]3-, M=Sc3+, Y3+, Ln3+, obtained by means of direct synthesis from the aqueous solutions, the composition of substances was studied by methods of chemical and electron microscopic analyzes, solubility and chemical resistance were determined. Radiographic and thermogravimetric characteristics, IR spectra, magnetic properties are studied. The experimental data obtained indicate the antiferromagnetic nature of the interaction between paramagnetic centers in the studied ionic compounds, the crystallographic parameters of which were determined by the method of X-ray diffraction analysis of single crystals at low temperatures. In the temperature range of 383-493 K, substances, without changing the physicochemical characteristics, reversibly change color, withstanding many heating-cooling cycles.

show abstract

“…One of the most important applications of these materials is their use as sorbents for concentration and recovery of metal ions from aqueous solutions [1,[5][6][7][8].…”

mentioning

confidence: 99%

“…One of the most important applications of these materials is their use as sorbents for concentration and recovery of metal ions from aqueous solutions [1,[5][6][7][8].Modifi cation of various polymeric materials with dithiooxamide (DTO) have been actively studied in recent years, which is due to its excellent complexing properties [9], in particular, those for noble metal ions owing to the simultaneous presence of nitrogen and sulfur ions in its structure. It is known that polysaccharides of Pseudochoricystis ellipsoidea weeds [10], cellulose [11] and chitosan are used as natural polymeric matrices.…”

mentioning

confidence: 99%

Synthesis of sorption materials based on dithiooxamidate aminopropyl polysiloxane

et al. 2014

Self Cite

View full text Add to dashboard Cite

Hybrid organo-inorganic materials produced by chemical modifi cation of polysiloxanes fi nd wide use due to the unique properties of the silica gel matrix and the possibility of obtaining materials with required properties by using an appropriate organic modifi er. One of the most important applications of these materials is their use as sorbents for concentration and recovery of metal ions from aqueous solutions [1,[5][6][7][8].Modifi cation of various polymeric materials with dithiooxamide (DTO) have been actively studied in recent years, which is due to its excellent complexing properties [9], in particular, those for noble metal ions owing to the simultaneous presence of nitrogen and sulfur ions in its structure. It is known that polysaccharides of Pseudochoricystis ellipsoidea weeds [10], cellulose [11] and chitosan are used as natural polymeric matrices. The sorbents obtained demonstrated a high sorption affi nity and selectivity with respect to Pd(II) and Pt(IV) ions, whereas the adsorption of simultaneously present Cu(II), Cd(II), Co(II), Ni(II), and Fe(III) ions was insignifi cant. The sorption capacity for Pd(II) ions at pH 2 was 3.24 mmol g -1 at a concentration of grafted groups of rubeanic acid of 0.4 mmol g -1 [12]. The maximum sorption capacity for Cu(II) and Cd(II) ions at pH 6 was 0.058 and 0.072 mmol g -1 , respectively, at a concentration of complexing groups of 0.150 mmol g -1 [11].Use of a synthetic polymer, polystyrene, makes it possible to substantially raise the sorption capacity for ions of 3d-metals. The maximum sorption capacity at pH 6 for Cu(II) and Zn(II) ions was 0.97 and 0.12 mmol g -1 , respectively, at a concentration of 1.0 mmol g -1 of grafted groups of rubeanic acid. Also known is the use of C 60 fullerene containing dithiooxamide groups for recovery of trace amounts of copper(II) ions [14].The modifi cation of siloxane polymeric matrices with dithiooxamide is represented in the literature by only two examples [15,16]. The authors used a block-copolymer produced by hydrolysis of aminopropyltriethoxysilane (APTES) on the surface of porous silica, which was then treated with rubeanic acid. A common shortcoming of sorbents of this kind is the low concentration of dithiooxamide groups (0.08-0.24 mmol g -1 ) and the resulting poor sorption capacity. The maximum capacity for Pd(II) and Pt(II) ions was 0.198 and 0.103 mmol g -1 , respectively [16].Abstract-Reaction of reamidation of rubeanic acid with aminopropyl polysiloxane was systematically studied. It was found that the given type of transformations make it possible to obtain a derivative of aminopropyl polysiloxane with surface dithiooxamide groups in a concentration of up to 0.78 mmol g -1 at a total degree of substitution of up to 0.25. The composition and structure of the derivatives obtained were characterized by elemental analysis, IR spectroscopy, thermogravimetry, and method of low-temperature adsorption of nitrogen. The sorption of Ni(II), Pd(II), and Pt(II) in a 0.2 M solution of hydrochloric acid was evaluated for the...

show abstract

Sol-gel synthesis and physicochemical properties of organosilicon materials functionalized by amino groups

Cited by 7 publications

References 21 publications

Chemical modification of hybrid nanostructures (POSS) for application as lubricant

Chemical modification of hybrid nanostructures (POSS) for application as lubricant

Chromium-Lanthanide Multi-Ligand Complexes as Precursors of New Materials

Synthesis of sorption materials based on dithiooxamidate aminopropyl polysiloxane

Contact Info

Product

Resources

About