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Acid Anhydride - PubAg

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Last Updated: 16 October 2021

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Kinetic Investigation of the Pyrolysis of Isobutyric Anhydride and Isobutyric Acid

Results showed that the pyrolysis temperature of IBA is far higher than that of IBAN, and dimethylketene selectivity throughout IBA pyrolysis is much less than that throughout IBAN pyrolysis. Additionally, compared to the four-centered shift state of acid pyrolysis, an extra stable six-centered shift state of anhydride pyrolysis was acquired by computational chemistry, which is the factor for the lower pyrolysis temperature level of anhydrides.

Source link: https://pubag.nal.usda.gov/catalog/7073243


Anhydride-cured epoxy resin reinforcing with citric acid-modified cellulose

The tensile toughness of cellulose/epoxy material composites were lowered with the content of cellulose boosted. On the various other hand, the tensile stamina of CAC/epoxy resin compounds were properly increased with the content of CAC increased. Furthermore, compared with pure epoxy materials and cellulose/epoxy resin composites, the Young's modulus and the toughness of CAC/epoxy material composites significantly raised with the presence of 10 wt% CAC. SEM pictures revealed that cellulose agglomerated in epoxy resins, in comparison, CAC dispersed uniformly in epoxy resins, figured out that the attachment in between CAC and epoxy resins were boosted after presented carboxyl groups to cellulose bring about the mechanical properties improved. CAC was additionally made use of to partially change MHHPA to reduce the usage of hazardous healing agent, and the mechanical properties of CAC/epoxy material compounds raised with reduced MHHPA content.

Source link: https://pubag.nal.usda.gov/catalog/6925493


Preparation and Characterization of Modified Starches Obtained in Acetic Anhydride/Tartaric Acid Medium

In the existing contribution chemically customized starches are prepared by response of corn starch in warm acetic anhydride, including tartaric acid. The changed starches obtained might be of rate of interest for different food and non‐food makes use of in which single qualities resulting from the acetyl teams intro and starch cross‐linking by a non‐toxic, normally happening natural acid such as tartaric acid may be of usage to properly meet products properties needs.

Source link: https://pubag.nal.usda.gov/catalog/6935223


Acid-labile anhydride-linked doxorubicin-doxorubicin dimer nanoparticles as drug self-delivery system with minimized premature drug leakage and enhanced anti-tumor efficacy

The collective DOX release from the proposed D-DOX nanoparticles reached 40. 6% within 36 h in the simulated growth intracellular acidic micro-environment, while the early medicine leak was just 4. 5% in the substitute normal physiological medium. The MTT results indicated the recommended DSDS had an enhanced anti-tumor effectiveness for the HepG2 cancer cells cell than the free DOX.

Source link: https://pubag.nal.usda.gov/catalog/6906314


Kinetics of 2-Methylfuran Acylation with Fatty Acid Anhydrides for Biorenewable Surfactants

Friedel-- Crafts acylation utilizing long-chain fatty acid derivatives and biomass-derived furans is the crucial response to produce "alkyl furan ketones", an important forerunner for biorenewable oleo-furan surfactants.

Source link: https://pubag.nal.usda.gov/catalog/7208863


Colorimetric indicators for volatile amines based on succinic anhydride (SAh)-grafted poly (lactic acid) (PLA)

Smart materials that can undergo modifications in color on the detection of amines have the prospective to provide info on the quality of fish and meat. To engineer a material that undertakes a change in shade on exposure to biogenic amines, succinic anhydride functional groups-- which are deprotonated in the existence of amines-- are implanted onto a biopolymer poly backbone. In this system, the reaction between SAh and amines protonates the dye and leads to an irreversible modification in color in the indications. Initially, signs of different degrees of SAh grafted onto PLA were exposed to the vapours from a 400 ppm amine remedy. A more in-depth research of the impact of temperature and amine concentration was carried out on signs with 30 wt% SAh. Greater focus and temperatures were located to boost the degree of the shade change while decreasing the half-time of the response of the signs.

Source link: https://pubag.nal.usda.gov/catalog/6961495


Chemically Fueled Transient Geometry Changes in Diphenic Acids

Transient adjustments in molecular geometry are vital to the function of many vital biochemical systems. Below, we reveal that diphenic acids undertake out-of-equilibrium adjustments in dihedral angle when reacted with a carbodiimide chemical gas. Treatment of suitably functionalized diphenic acids with EDC produces the equivalent diphenic anhydrides, reducing the torsional angle about the biaryl bond by ∼ 45 °, despite replacement.

Source link: https://pubag.nal.usda.gov/catalog/7120933


FTIR based kinetic characterisation of an acid-catalysed esterification of 3-methylphthalic anhydride and 2-ethylhexanol

The design response is the two-step diesterification of 3-methylphthalic anhydride with 2-ethylhexanol being composed of alcoholysis as the primary step, complied with by an acid-catalysed, 2nd esterification action bring about the corresponding diester. The acid-catalysed, second esterification step was identified as the restricting response action. From batch reactions conducted at various temperatures, the energy of activation of this step was determined to be 79. 5 kJ mol ⁻¹. In addition, kinetics were revealed to adhere to a pseudo-first order relative to the monoester formation and a kinetic model was developed.

Source link: https://pubag.nal.usda.gov/catalog/7002149


Novel kinetics model for the crosslinking reaction of 1,2,3,4-butanetetracarboxylic acid with cellulose within cotton fabrics

1,2,3,4-butanetetracarboxylic acid has been explored as formaldehyde-free crosslinking agent for years. In this study, an unique kinetic version for cellulose reacted by BTCA was proposed and the variables that affected the model parameters were explored thoroughly, which can aid us comprehend crosslinking mechanism clearly. Kinetic version, which is a successive reaction version, including implanting response rate constant and crosslinking reaction rate consistent, was deduced. The Arrhenius activation energies of grafting and crosslinking reactions are 86. 3 kJ/mol and 102. 8 kJ/mol, specifically, showing high temperature level is much more for enhance the rate of crosslinking responses comparing with grafting response. The whole reaction is influenced by driver of SHP, which might react with BTCA anhydride to form BTCA-SHP compounds.

Source link: https://pubag.nal.usda.gov/catalog/7375643


Metal-free and iron(II)-assisted oxidation of cyclohexane to adipic acid with ozone: A theoretical mechanistic study

Adipic acid has a tremendous used significance. Here, a mechanism of environmentally benign cool cyclohexane oxidation with ozone into adipic acid under space temperature and radiation-free problems, both metal-free and catalyzed by the iron facility [FeCl ₂ κ ³-HC ₃], was investigated by theoretical methods. Reasonably high activation barriers of the rate restricting H-abstractions by O ₃ without a driver clarify the experimentally observed low CyH conversion and selectivity towards adipic acid as a result of reliable buildup of cyclohexanone.

Source link: https://pubag.nal.usda.gov/catalog/7368296

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions