New siloxane-containing iron(III) carboxylate clusters

Racleş, Carmen; Silion, Mihaela; Stănică, Nicolae; Cazacu, Maria; Turta, Constantin

doi:10.1016/j.jorganchem.2012.03.024

Cited by 3 publications

(3 citation statements)

References 47 publications

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“…However, the DA reaction was not evidenced on the subsequent cooling. The preponderance of the The ESI-MS allows for the direct analysis of sample solutions; however, the size of the peaks do not offer a quantitative evaluation of the data, but only qualitative [52,53]. The method was employed for compounds synthesized via Diels-Alder chemistry in order to track the progress of the transformation [54,55].…”

Section: Discussionmentioning

confidence: 99%

“…As the anthracene is released, the maleimide groups can react with the allyl groups (-ene reaction via Wagner-Juaregg intermediate), and the viscosity of the product growths and the thermal transfer is delayed. The ESI-MS allows for the direct analysis of sample solutions; however, the size of the peaks do not offer a quantitative evaluation of the data, but only qualitative [52,53]. The method was employed for compounds synthesized via Diels-Alder chemistry in order to track the progress of the transformation [54,55].…”

Section: Differential Scanning Calorimetry Analysis Of Polyester Resinsmentioning

confidence: 99%

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Evidence through Thermal Analysis of Retro Diels-Alder Reaction in Model Networks Based on Anthracene Modified Polyester Resins

Ionita,

Cristea,

Gaina

et al. 2023

Polymers

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The present work is focused on polyester resins obtained from the diglycidyl ether of bisphenol A and anthracene modified 5-maleimidoisophthalic acid. Because the maleimide-anthracene Diels–Alder (DA) adduct is stable at high temperatures, it is considered a good option for high performance polymers. However, the information related to the retroDA reaction for this type of adduct is sometimes incoherent. A detailed thermal study (conventional TGA, HiRes TGA, MTGA, DSC, MDSC) was performed in order to establish whether the rDA reaction can be revealed for this type of anthracene modified polyester resins. The TGA method confirmed the cleavage of the anthracene–maleimide DA adduct, while the DSC demonstrated the presence of anthracene in the system. At high temperatures, unprotected maleimide homopolymerizes and/or reacts with allyl groups according to the –ene reaction. Therefore, the thermal DA reaction is not displayed anymore upon the subsequent cooling, and the glass transition region is registered at a higher temperature range during the second heating. The use of sample-controlled thermal analysis (HiRes TGA) and MTGA improved the TGA result; however, it was not possible to separate the very complex degradation processes that are interconnected.

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Section: Discussionmentioning

confidence: 99%

Section: Differential Scanning Calorimetry Analysis Of Polyester Resinsmentioning

confidence: 99%

Evidence through Thermal Analysis of Retro Diels-Alder Reaction in Model Networks Based on Anthracene Modified Polyester Resins

Ionita,

Cristea,

Gaina

et al. 2023

Polymers

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“…A patent 20 discloses ferrosiloxane stabilizers such as Fe 3+ ((OSiR 1 R 2 R 3 ) 2 (OCOR 4 ), where R 1 , R 2, R 3 , and R 4 are alkyl, alkaryl, alkenyl, or aryl group having from 1 to 25 carbon atoms; while R 2 could also be hydrogen or a siloxy group and wherein R 3 could also be a siloxy or substituted siloxy group. Later papers have been published by Moran et al, 21 who constructed compounds with iron carbonyls, by Walavalkar et al 22 and Races et al 23 One study 23 refers to the thermal stability of the iron siloxane, though the more complete studies have been obtained from the compound thermal data. 24 Other metals apart from iron have also been studied, 25 but iron remains the most commonly used thermal stabilizer for prolonging the life of PDMS when exposed to a gas stream that contains oxygen.…”

Section: ■ Introductionmentioning

confidence: 99%

Thermally Stable Silicone Solvents for the Selective Absorption of CO₂ from Warm Gas Streams That Also Contain H₂ and H₂O

et al. 2016

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Polydimethylsiloxane (PDMS) is a promising hydrophobic, CO 2 -selective solvent for the absorption of CO 2 from a hot or warm water-rich, H 2 -rich, postwater−gas shift reactor (WGSR) stream in an integrated gasification combined cycle (IGCC) power plant. In this work, there are three hydrophobic silicones that are more thermally stable than PDMS, including an iron-stabilized PDMS (PDMS-Fe), poly(dimethyl-co-methylphenyl)siloxane (PDMMPS), and poly(dimethyl-co-diphenyl)-siloxane (PDMDPS). PDMDPS is an extremely poor CO 2 solvent, which is undesirable for the proposed separation, and a poor hydrogen solvent, which is a desirable trait. PDMDPS and PDMMPS absorb about the same amount of H 2 . Although PDMMPS is a much better CO 2 solvent than PDMDPS, PDMMPS is a slightly poorer CO 2 solvent than PDMS or PDMS-Fe. PDMS-Fe and PDMS are comparable hydrophobic solvents that exhibit the greatest solvent strength for CO 2 ; however, PDMS-Fe and PDMS absorb slightly more hydrogen than PDMDPS and PDMMPS. If the absorption/regeneration process is designed such that the solvent is exposed to temperatures no greater than 230°C, PDMS is recommended due to its low cost. For higher temperatures, the extremely low solubility of CO 2 in PDMDPS precludes its use as a CO 2 -selective solvent. The ferrosilicone additive in PDMS-Fe is designed to inhibit polymer degradation in an oxidizing environment, but it offers no additional stability in the oxygen-free closed system associated with the IGCC. PDMMPS absorbs less H 2 than PDMS or PDMS-Fe but is a slightly poorer CO 2 solvent than PDMS or PDMS-Fe. However, PDMMPS is thermally stable in closed systems to 300°C. Therefore, PDMMPS is recommended for prolonged high temperature use as the precombustion carbon capture absorber solvent at absorption/regeneration temperatures above 230°C. Although these hydrophobic silicones exhibit promising attributes for a warm or hot precombustion carbon capture process, the diminishing CO 2 solubility and increasing CO 2 solubility that occur with increasing temperature will challenge the economic viability of this proposed CO 2 -selective absorption process. ■ INTRODUCTIONChemical and physical absorption methods are typically used for the postcombustion and precombustion capture of CO 2 , respectively. 1 At low CO 2 partial pressures of ∼0.010−0.015 MPa associated with postcombustion capture of CO 2 from flue gas, amine solutions are favored because they will react with dilute concentrations of CO 2 to attain significant loadings. A 30 wt % solution of monoethanolamine (MEA) in water, for example, will bind CO 2 as a water-soluble ammonium carbamate at a 2:1 molar ratio of MEA:CO 2 , enabling this solution to absorb about 11 wt % CO 2 . CO 2 release and solvent regeneration is accomplished via heating. 1,2 Precombustion capture of CO 2 is typically accomplished with physical solvents, however, because the high CO 2 partial pressure in the post water−gas shift reactor (WGSR) gas stream is sufficient to cause the dissolution of significant amounts of CO ...

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Copper(II) complexes with spherical morphology generated in one step by amphiphilic ligands: in situ view of the self-assembling, characterization, catalytic activity

Turcan-Trofin¹,

Zaltariov²,

Mihail³

et al. 2019

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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New siloxane-containing iron(III) carboxylate clusters

Cited by 3 publications

References 47 publications

Evidence through Thermal Analysis of Retro Diels-Alder Reaction in Model Networks Based on Anthracene Modified Polyester Resins

Evidence through Thermal Analysis of Retro Diels-Alder Reaction in Model Networks Based on Anthracene Modified Polyester Resins

Thermally Stable Silicone Solvents for the Selective Absorption of CO₂ from Warm Gas Streams That Also Contain H₂ and H₂O

Copper(II) complexes with spherical morphology generated in one step by amphiphilic ligands: in situ view of the self-assembling, characterization, catalytic activity

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New siloxane-containing iron(III) carboxylate clusters

Cited by 3 publications

References 47 publications

Evidence through Thermal Analysis of Retro Diels-Alder Reaction in Model Networks Based on Anthracene Modified Polyester Resins

Evidence through Thermal Analysis of Retro Diels-Alder Reaction in Model Networks Based on Anthracene Modified Polyester Resins

Thermally Stable Silicone Solvents for the Selective Absorption of CO2 from Warm Gas Streams That Also Contain H2 and H2O

Copper(II) complexes with spherical morphology generated in one step by amphiphilic ligands: in situ view of the self-assembling, characterization, catalytic activity

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Product

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Thermally Stable Silicone Solvents for the Selective Absorption of CO₂ from Warm Gas Streams That Also Contain H₂ and H₂O