Carboxylic Acid Ionic Modification of Castor‐Oil‐Based Polyurethanes Bearing Amine Groups: Chemically Tunable Physical Properties and Recyclability

Comí, Marc; Fernández, María Tomé; Santamaría, Antxón; Lligadas, Gerard; Ronda, Juan C.; Galià, Marina; Cádiz, Virgínia

doi:10.1002/macp.201700379

Cited by 11 publications

(8 citation statements)

References 24 publications

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“…The infrared spectra of saturated fatty acids (sFA) have been studied and their features have been previously reported [ 106 , 107 , 108 , 109 , 110 , 111 ]. In particular, studies for C8:0–C18:0 [ 112 , 113 , 114 , 115 , 116 ] may provide powerful identification tools.…”

Section: Resultsmentioning

confidence: 99%

Fatty Acids and Their Metal Salts: A Review of Their Infrared Spectra in Light of Their Presence in Cultural Heritage

2021

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In a cultural heritage context, fatty acids are usually found as breakdown products of lipid-containing organic remains in archaeological findings, binders in aged oil paintings, and additives in modern art-related materials. They may further interact with the ionic environment transforming into metal soaps, a process that has been recognized as a threat in aged paintings but has received less attention in archaeological objects. The investigation of the above related categories of materials with infrared spectroscopy can provide an overall picture of the organic components’ identity and demonstrate their condition and prehistory. The capability of investigating and distinguishing fatty acids and their metal soaps through their rich infrared features, such as the acidic carbonyl, the carboxylate shifts, the variable splits of alkyl chain stretching, bending, twisting, wagging, and rocking vibrations, as well as the hydroxyl peak envelopes and acid dimer bands, allows for their direct detailed characterization. This paper reviews the infrared spectra of selected saturated fatty monoacids and diacids, and their corresponding sodium, calcium, and zinc salts and, supported by newly recorded data, highlights the significance of their spectroscopic features.

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Section: Resultsmentioning

confidence: 99%

Fatty Acids and Their Metal Salts: A Review of Their Infrared Spectra in Light of Their Presence in Cultural Heritage

2021

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“…The presence of these bands supports the formation of antiparallel β‐sheet like arrangements in both hydrogels. ,[21] Peaks at 1733 and 1676 cm −1 correspond to the C=O stretching bands for protonated carboxylic acids and residual carboxylate anions respectively [22] . The formation of β‐sheet in both cases was confirmed by Circular Dichroism (CD) spectra (Figure S3).…”

Section: Resultsmentioning

confidence: 85%

“…, [21] Peaks at 1733 and 1676 cm À 1 correspond to the C=O stretching bands for protonated carboxylic acids and residual carboxylate anions respectively. [22] The formation of β-sheet in both cases was confirmed by Circular Dichroism (CD) spectra (Figure S3). Both solutions (Pep-A and a 1 : 4 mixture of Pep-A and Pep-B in pH 6.5 buffer) showed a characteristic negative cotton effect at 220 nm.…”

Section: Formation and Characterization Of Composite Hydrogelmentioning

confidence: 78%

Mannose‐Decorated Composite Peptide Hydrogel with Thixotropic and Syneresis Properties and its Application in Treatment of Leishmaniasis

Dowari

Roy

Das

et al. 2022

Chemistry An Asian Journal

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Leishmaniasis, caused by the intramacrophage protozoan parasite Leishmania donovani, is a life-threatening yet neglected vector-borne disease. Few medications for the treatment of this disease are available. However, targeted delivery of drugs to macrophages remains a significant concern. Macrophages are equipped with many receptors, and therefore putting suitable ligands in the macrophage targeting drug delivery vehicle gained a lot of attention. One such receptor is the mannose receptor, abundantly expressed by macrophages. To treat this deadly disease, in this study, a mannose containing composite hydrogel is prepared by combining a self-aggregating short peptide (Nap-FFGE-NH 2 , Pep-A) and a mannose containing non-aggregating peptide (Nap-FF-mannosyl, Pep-B). The self-aggregation of the composite hydrogel is evaluated using various spectroscopic and microscopic techniques. Intermolecular hydrogen bonding and π-π stacking lead to an antiparallel β-sheet like arrangement of the peptides. Notably, the composite hydrogel showed shear-thinning and syneresis properties. Moreover, the composite hydrogel was found to be stable in cell-culture media, biodegradable and non-toxic to the macrophages. Both control and infected macrophages showed effective cell growth and proliferation when subjected to the composite 2D and 3D hydrogel matrix. When treated with Amphotericin B loaded composite hydrogel, the drug was effectively delivered to kill the parasite in the infected macrophages. Almost 3.5 fold decrease in the parasite burden was recorded when infected cells were treated with drug-loaded composite hydrogel. The injectability, biodegradability, non-cytotoxicity, and efficient drug delivery properties of the mannosefunctionalized hydrogel make it a suitable candidate for the treatment of Leishmaniasis.

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“…Apart from adsorption maxima at 1200 cm −1 (1199 cm −1 for trifluoracetic acid and 1224 cm −1 for modified fly ash), characteristic for the -CF3 group, the shift of the absorption band characteristic for the carbonyl group in CF3-CO-O- from 1785 cm −1 to 1680 cm −1 corresponds to the conversion of free trifluoroacetic acid into its salt, which is also visible. This is additionally confirmed by the disappearance of the wide band with the maximum at 3423 cm −1 , characteristic for the -OH groups present in carboxylic acids [ 38 ].…”

Section: Resultsmentioning

confidence: 90%

Fly Ash from Lignite Combustion as a Filler for Rubber Mixes—Part II: Chemical Valorisation of Fly Ash

et al. 2022

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Fly ash (FA) fractions with a particle size of 63 µm < FA < 250 µm obtained by sieve fractionation were used as a partial carbon black (CB) replacement in a rubber mixture based on styrene-butadiene rubber (SBR). In order to improve the interactions at the interface between rubber and fractionated ash, at the stage of preparing the rubber mixtures, two different vinyl silanes were added to the system: Vinyltrimethoxysilane (U-611) or Vinyl-tris (2-methoxy-ethoxy) silane (LUVOMAXX VTMOEO DL50), silane with epoxy groups: 3-(glycidoxypropyl)trimethoxysilane (U-50) or sulfur functionalized silanes: containing sulfide bridges: Bis(triethoxysilylpropyl)polysulfide silane (Si-266) or mercapto groups: Mercaptopropyltrimethoxysilane (Dynaslan MTMO). The conducted research confirmed the effectiveness of silanization with selected functional silanes, from the point of view of improving the processing and operational properties of vulcanizates, in which CB is partially replaced with the finest fractions of fly ash. The silanization generally increased the interaction at the rubber–ash interface, while improving the degree of filler dispersion in the rubber mixture. The results of TGA and FTIR analyses confirmed the presence of silanes chemically bonded to the surface of fly ash particles. SEM tests and determination of the bound rubber (BdR) content show that the introduction of the silanes to the mixture increases the degree of ash dispersion (DI) and the Payne effect, which is the greatest when mercaptosilane was used for modification. The highest increase in torque, which was recorded in the case of rubber mixtures containing sulfur silanes and silane with epoxy groups, may be due to their participation in the vulcanization process, which is confirmed by the results of vulcametric studies. The lowest values of mechanical strength, elongation at break, and the highest hardness of vulcanizates obtained in this case may be the result of the over-crosslinking of the rubber. The addition of sulfur-containing silanes significantly slowed down the vulcanization process, which is particularly visible (up to three times extension of the t90 parameter, compared to mixtures without silane) in the case of Si-266. The addition of silanes, except for Si-266 (with a polysulfide fragment), generally improved the abrasion resistance of vulcanizates. The Dynaslan MTMO silane (with mercapto groups) performs best in this respect. Proper selection of silane for the finest fraction of fly ash in the rubber mixtures tested allows for an increase in the mechanical strength of their vulcanizates from 9.1 to 17 MPa, elongation at break from 290 to 500%, hardness from 68 to 74 °ShA, and reduction in abrasion from 171 to 147 mm3.

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Carboxylic Acid Ionic Modification of Castor‐Oil‐Based Polyurethanes Bearing Amine Groups: Chemically Tunable Physical Properties and Recyclability

Cited by 11 publications

References 24 publications

Fatty Acids and Their Metal Salts: A Review of Their Infrared Spectra in Light of Their Presence in Cultural Heritage

Fatty Acids and Their Metal Salts: A Review of Their Infrared Spectra in Light of Their Presence in Cultural Heritage

Mannose‐Decorated Composite Peptide Hydrogel with Thixotropic and Syneresis Properties and its Application in Treatment of Leishmaniasis

Fly Ash from Lignite Combustion as a Filler for Rubber Mixes—Part II: Chemical Valorisation of Fly Ash

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