Colorimetric Determination of Rosin and Rosin Esters

Swann, M. H.

doi:10.1021/ac60054a014

Cited by 9 publications

(3 citation statements)

References 4 publications

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“…In most cases, the violet rapidly changes to a nondescript brown which is not specific for this group of constituents. Swann (6) has modified the general test and applied it to the qualitative and quantitative determination of rosin and rosin derivatives in surface coatings.…”

Section: Literature Citedmentioning

confidence: 99%

The Spectrophotometric Determination of Abietic-Type Dienoic Rosin Acids.

Stephens¹,

Lawrence²

1962

Anal. Chem.

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Section: Literature Citedmentioning

confidence: 99%

The Spectrophotometric Determination of Abietic-Type Dienoic Rosin Acids.

Stephens¹,

Lawrence²

1962

Anal. Chem.

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“…The increase in weight of the absorbent, corrected by a blank, represents the moisture content of the sample. Rapid methods have also been suggested for moisture determinations in sausage products (65) and in grains (9), the latter being based on the determination of the dielectric constant of the whole grain, which can be obtained in a few seconds and translated to moisture content with an accuracy of ±0.2%.…”

Section: Reviewsmentioning

confidence: 99%

Coatings

Rochow¹,

Stafford²

1952

Anal. Chem.

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“…Hydroperoxides easily form when rosin acid is oxidized, and they have an allergic reaction to the human body. , Therefore, it is very important to study the stability of resin acids and rosin-modified resins for production, storage, and use of products. Thermogravimetric (TG) analysis and colorimetric methods have been used for the determination of rosin and the thermal stability of rosin-modified resins. Minn determined the stability of six purified rosin acid structures including abietic, neoabietic, palustric, levopimaric, isopimaric, and dehydroabietic acids using high-pressure differential scanning calorimetry (HPDSC).…”

Section: Introductionmentioning

confidence: 99%

Thermal Stability Evaluation of Resin Acids and Rosin Modified Resins

Liu

Saburi

et al. 2020

ACS Omega

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Rosin is a sustainable resource, which is mainly composed of resin acid. Rosin-modified resin is widely used in adhesives, inks, coatings, and other fields, and its stability is very important for the production, storage, and use of products. Thermal stability and reactivity of three resin acids (levopimaric acid, neoabietic acid, and dehydroabietic acid) and four rosin-modified resins were studied using an accelerating rate calorimeter (ARC). They are stable, and exothermic reactions do not occur even when they were heated to 200 °C under a nitrogen atmosphere, but they are unstable under an oxygen atmosphere. The mechanism of the oxidation reaction process was found: first, resin acids absorb oxygen, and then an exothermic oxidation occurs. The initial exothermic temperature (T 0) of levopimaric acid, neoabietic acid, and dehydroabietic acid are 354.01, 353.83, and 398.20 K, the initial oxidation kinetics shows a second-order reaction, and the activation energies (E a) are 42.90, 58.05, and 46.60 kJ/mol, respectively. Peroxide concentration of three resin acids were determined by iodometry. The T 0 values of hydrogenated rosin, disproportionated rosin, hydrogenated rosin glyceride, and hydrogenated rosin pentaerythritol ester, the four rosin-modified resin, are 353.71, 348.32, 412.85, and 412.44 K. Levopimaric acid and neoabietic acid have higher oxidative reactivity and easily undergoes an oxidation reaction at lower temperature. Rosin-modified resins are stable and find it difficult to undergo oxidation reactions.

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Colorimetric Determination of Rosin and Rosin Esters

Cited by 9 publications

References 4 publications

The Spectrophotometric Determination of Abietic-Type Dienoic Rosin Acids.

The Spectrophotometric Determination of Abietic-Type Dienoic Rosin Acids.

Coatings

Thermal Stability Evaluation of Resin Acids and Rosin Modified Resins

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