FT-IR study of the hydrolysis and condensation of 3-(2-amino-ethylamino)propyl-trimethoxy silane

Rubio, Juan; Mazo, M. Alejandra; Martín-Ilana, Araceli; Tamayo, Aitana

doi:10.1016/j.bsecv.2017.11.003

Cited by 34 publications

(14 citation statements)

References 32 publications

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“…The peak around 1010 cm −1 indicates that there is a cage structure in the PSQ, the peak at 1131 cm −1 indicates that there is a ladder or layered structure in the PSQ, and the peak at 784 cm −1 is ascribed to Si–C bond stretching vibration [25,26,27]. At last, the peaks at 910 and 1461 cm −1 are attributed to epoxy and N–H bonds [27,28], and the absorption band at 1640 cm −1 corresponds to bending vibration of the hydroxyl group of absorbed water. All the results mentioned above show that P 5 PSQ has the structure of the original PSQ, and the basic structure of the PSQ has not been destroyed during the grafting process of phosphate.…”

Section: Resultsmentioning

confidence: 99%

Flame Retardancy and Mechanism of Novel Phosphorus-Silicon Flame Retardant Based on Polysilsesquioxane

et al. 2019

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A novel phosphorus-silicon flame retardant (P5PSQ) was prepared by bonding phosphate to silicon-based polysilsesquioxane (PSQ) and used as flame retardant of poly (lactic acid) (PLA). The results show that PLA with 10 wt % P5PSQ has a limiting oxygen index (LOI) 24.1%, the peak heat release rate (PHRR) and total heat release (THR) of PLA decrease 21.8% and 25.2% compared to neat PLA in cone calorimetric test, indicating that P5PSQ shows better flame retardancy in comparison to PSQ. Furthermore, the study for the morphology and composition of carbon residue after the combustion of PLA and the gas release of PLA during combustion illustrate that P5PSQ has flame retardancy in condensed phase and gas phase simultaneously. In condensed phase, phosphorus from phosphate promotes the formation of more stable and better carbon layer containing Si and P, which inhibits the transfer of heat and oxygen in the combustion. In gas phase, the phosphate in P5PSQ emits phosphorus-containing compound that can restrain the release of C–O containing products, which may have effective flame retardancy for PLA in gas phase to a certain extent. In one word, P5PSQ is denoted as a good phosphorus-silicon synergistic flame-retardant.

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Section: Resultsmentioning

confidence: 99%

Flame Retardancy and Mechanism of Novel Phosphorus-Silicon Flame Retardant Based on Polysilsesquioxane

et al. 2019

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“…The peak at 782 cm À1 of Si-C bond stretching vibration peak existed in the spectra of both PSQ and PPSQ. 36,41,42 The rocking vibration absorption of primary amine at 850 cm À1 disappeared in PPSQ, which indicates that the amino group reacted with phosphite.…”

Section: Characterization Of Psq and Ppsqmentioning

confidence: 99%

Improving the stability and ductility of polylactic acid via phosphite functional polysilsesquioxane

et al. 2019

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“…The EDS energy spectra (Figure 4g−j) show that the ambient-dried ASMs are mainly composed of Si, O, and C elements, showing a relatively uniform distribution, which proves that the raw materials are well mixed in the slurry stage, and fumed silica powder does not gravitationally settle during the gelation process. Figure 6a shows the FTIR spectra of fumed silica, MTMS, and the ASM-5:5-20 sample, the disappearance of the characteristic peak of silane (Si−O−C) located at 1190 and 1086 cm −1 , 43 and a broader characteristic absorption peak of silica (Si−O−Si) was observed at 1105, 1032, and 780 cm −1 , 44 which proves that the hydrolysis−condensation reaction of MTMS silane is fully catalyzed by nitric acid and urea. The peak intensity of hydroxyl groups of ASMs at 3390 cm −1 was significantly weaker than that of fumed silica, suggesting that the hydroxyl group on the fumed silica backbone is involved in the condensation reaction during the gelation process.…”

Section: Chemical Compositionmentioning

confidence: 99%

Fumed Silica-Derived, Ambient Dried, and Low-Cost Nanoporous Aerogel-like Monoliths for Thermal Insulation

Zhang

Wang

Feng

et al. 2023

ACS Appl. Nano Mater.

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Nanoporous silica aerogels have great potential in the application of thermal insulation. However, the commonly used supercritical drying technology of nanoporous silica aerogels has disadvantages such as high cost, high complexity, and harsh drying conditions. Herein, a template orientation strategy has been proposed for fabricating nanoporous aerogel-like silica monoliths (ASMs) based on the low-cost, rapid ambient drying technology without additional treatments of surface modification and solvent exchanging. The successful implementation of the template orientation strategy depends on the silica slurry, which is composed of commercial fumed silica, hydrolyzed methyltrimethoxysilane (MTMS), and sole water solvent. The solidification of silica slurry has been achieved by a controlled polycondensation reaction catalyzed by ammonia originating from the thermolysis of urea. Owing to the skeleton enhancement of fumed silica powders and the hydrophobic effect of methyl groups, ASMs maintain well monolithic formability during ambient drying. Meanwhile, low-cost fumed silica powders have been seen as template orientation agents for inducing MTMS molecules to generate nanoparticle-based network skeletons, endowing ASMs with typical nanopore features (specific surface area as high as 113 m2/g and pore diameter distribution concentrated at ∼40 nm). The resulting ASMs exhibit low density (0.36 g/cm3), high compressive strength (0.92 MPa), and low thermal conductivity [0.056 W/(m·K)]. This work would provide significant guidelines for the fabrication and thermal insulation applications of nanoporous ASMs derived from ceramic powders. This simple and low-cost preparation strategy would promote the large-scale applications and industrial production of nanoporous silica for thermal insulation materials.

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FT-IR study of the hydrolysis and condensation of 3-(2-amino-ethylamino)propyl-trimethoxy silane

Cited by 34 publications

References 32 publications

Flame Retardancy and Mechanism of Novel Phosphorus-Silicon Flame Retardant Based on Polysilsesquioxane

Flame Retardancy and Mechanism of Novel Phosphorus-Silicon Flame Retardant Based on Polysilsesquioxane

Improving the stability and ductility of polylactic acid via phosphite functional polysilsesquioxane

Fumed Silica-Derived, Ambient Dried, and Low-Cost Nanoporous Aerogel-like Monoliths for Thermal Insulation

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