Influence of isoeugenol as a chelating agent on the structure of Si–Ti polymeric systems obtained from alkoxides

Méndez-Vivar, J.; Mendoza-Serna, R.; Bosch, P.; Lara, V.H.

doi:10.1016/s0022-3093(99)00247-1

Cited by 23 publications

(13 citation statements)

References 38 publications

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“…There are additional stronger bands at 3621, 3653, and 3696 cm Ϫ1 in both spectra, characteristic of tetrahedral coordinated vacancies and designated as 4 Ti 4ϩ -OH. A further band at 3765 cm Ϫ1 was assigned to octahedral vacancies and designated as 6 Ti 3ϩ -OH. This region at 3600 -3800 cm Ϫ1 was therefore identified as being representative of nonhydrogen-bonded hydroxyl groups (labeled as isolated or free hydroxyl groups).…”

Section: Infrared Spectroscopymentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10][11][12] The promise of these new hybrid materials is a controllable combination of the properties of the polymer (flexibility, toughness, and easy processing) and the ceramic/ glass (hardness, durability, and thermal stability). In synthesizing the organic-inorganic composite, the organic polymer is generally the dominant phase, modified by the inorganic phase.…”

Section: Introductionmentioning

confidence: 99%

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In situ polymerization of titanium isopropoxide in polycaprolactone: Properties and characterization of the hybrid nanocomposites

2004

J of Applied Polymer Sci

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ABSTRACT:In this study, tetra isopropyl ortho titanate (TTIP) and polycaprolactone (PCL) were chosen as the ceramic precursor and the continuous phase, respectively, for the preparation of novel nanocomposites by using an in situ sol-gel process. In addition, acrylic acid grafted polycaprolactone (PCL-g-AA) was investigated as an alternative to PCL. The hybrids (PCL/TiO 2 and PCL-g-AA/TiO 2 ) were characterized via Fourier transform infrared (FTIR) spectroscopy, dynamic mechanical thermal analysis (DMA), X-ray diffraction (XRD), differential scanning calorimetry (DSC), thermogravimetry analysis (TGA), and Instron mechanical testing. It was found that the carboxylic acid groups of acrylic acid acted as coordination sites for the titania phase to form chemical bonds, thus improving the properties of the acrylic acid grafted composite compared with its acrylicacid-free counterpart. The TiO 2 content also determined the strength of interfacial bonding between the polymer chains and the ceramic phase, as shown by changes in glass transition temperature (T g ) with TiO 2 content. The maximum values of tensile strength and T g were obtained with the PCL-g-AA/TiO 2 composite at 10 wt % TiO 2 . At TiO 2 contents above this, excess particles led to segregation between the organic and inorganic phases.

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Section: Infrared Spectroscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In situ polymerization of titanium isopropoxide in polycaprolactone: Properties and characterization of the hybrid nanocomposites

2004

J of Applied Polymer Sci

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“…3: TiO 2 as reference ( Fig. 3(a)), ZrO 2 as reference Table 1 Physical appearance of sols and gels O-H stretching [15] 3345 w 3346 m 3400 w C-H stretching [16] 2965 SH, s 2923 SH, s 2930 SH, s C@O stretching [15] 1718 m 1731 SH, s 1728 SH, s C@C stretching [17] 1636 [18] 1376 SH, m 1375 SH, m 1376 SH, s C-O-Zr stretching [18] 1296 w 1272 m 1273 m C-O stretching [15] 1180 w 1190 m 1191 m 1066 m 1066 m 1066 s O-C-O-Ti as a bridge [19] 967 w 967 m 984 s CH 2 and CH 3 [15] 828 w 829 m 828 m Ti-O-Ti [20] 680 w 700 w 695 w 660 w 650 w Zr-O [21] 625 w w: Weak, m: medium, SH: sharp, s: strong, W: wide. Fig.…”

Section: Radial Distribution Functionsmentioning

confidence: 99%

Synthesis and spectroscopic study of mixed metal clusters using methacrylate and acrylate ligands

Méndez-Vivar

Bosch²,

Lara

2005

Journal of Non-Crystalline Solids

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“…In both cases a pre-hydrolyzed TEOS sol was used to react with the monomeric Ti chelated precursor to control its chemical reactivity. The experimental strategy to obtain Si-Ti polymeric systems using the sol-gel process is based on previous studies [11][12][13][14]. The aim of this work was to obtain SiO 2 -TiO 2 membranes from polymers where Ti was previously stabilized using acacH or isoH.…”

Section: Introductionmentioning

confidence: 99%

SiO2-TiO2 membranes by the sol-gel process

Méndez-Vivar

Mendoza-Serna

2006

Silicon Chem

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The use of membranes for gas separation represents an important alternative from the viewpoint of energy conservation in industrial separation processes. Polymeric Si-Ti sols prepared from titanium isopropoxide (Ti(OPr i ) 4 ) and tetraethoxysilane (TEOS) were used to deposit membranes on α-Al 2 O 3 supports. Acetylacetone (2,4 pentanedione, acacH) and isoeugenol (2-methoxy-4-propenylphenol, isoH) were employed separately to chelate the Ti precursor in order to slow down the chemical reactivity, avoiding precipitation. The radial distribution functions (RDF) of the gels aging at room temperature were obtained. The xerogels were studied by Thermal Gravimetric (TGA) and Differential Thermal (DTA) Analysis in air. The Microporosity of the solids calcined at 773 K was determined by N 2 -adsorption at 77 K. The membrane thickness was determined from SEM photographs. Preliminary permeance results of the supported membranes on commercial alumina support were obtained for He, N 2 and CO 2 in a single gas equipment. At 773 K the separation factors α(He/CO 2 ) and α(N 2 /CO 2 ) for both membranes exceeds the theoretical Knudsen limit.

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Influence of isoeugenol as a chelating agent on the structure of Si–Ti polymeric systems obtained from alkoxides

Cited by 23 publications

References 38 publications

In situ polymerization of titanium isopropoxide in polycaprolactone: Properties and characterization of the hybrid nanocomposites

In situ polymerization of titanium isopropoxide in polycaprolactone: Properties and characterization of the hybrid nanocomposites

Synthesis and spectroscopic study of mixed metal clusters using methacrylate and acrylate ligands

SiO2-TiO2 membranes by the sol-gel process

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