Melting Point Calorimeter for Purity Determinations

Aston, J. G.; Fink, H.; Tooke, J. W.; Cines, M. R.

doi:10.1021/ac60004a002

Cited by 17 publications

(8 citation statements)

References 11 publications

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“…Furthermore, the melting temperatures of EP-B and EP-F were evaluated using a DSC (Figure S2). It is well known that the determination of melting point has been widely used in organic chemistry to evaluate the purity of the prepared compound, and the more pure the compound, the sharper the melting peak is . In Figure S2, both EP-B and EP-F exhibit a very sharp melting peak, indicating their satisfying purities.…”

Section: Resultsmentioning

confidence: 99%

Comparative Study on the Properties of Epoxy Derived from Aromatic and Heteroaromatic Compounds: The Role of Hydrogen Bonding

Liu

Zhao²,

Peng

et al. 2020

Ind. Eng. Chem. Res.

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Epoxy derived from heteroaromatic compounds and its properties are seldom reported. In this work, two model epoxy monomers (EP-B and EP-F) were synthesized from isophthalic acid and 2,5-furandicarboxylic acid. After curing with 4,4-diaminodiphenylmethane (DDM) in a stoichiometric quantity of 2:1, their properties were comparatively investigated, especially the formation and role of hydrogen bonding in them were identified. Results obtained from differential scanning calorimetry (DSC), dynamic thermomechanical analysis (DMA), fluorescence emission spectra, and static contact angle measurements showed that the cured EP-F/DDM system exhibited unexpected performance in higher glass transition temperature (T g), fluorescence intensity, and hydrophilicity. And temperature-dependent Fourier transform infrared (FT-IR) analysis further confirmed that it was the more hydrogen bonding in the cured EP-F/DDM, involved with the oxygen heteroatoms in the furan ring, which led to its better properties. This work gives us some new insights into the role of electronegative heteroatoms in epoxy resin synthesized from heteroaromatic compounds.

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Section: Resultsmentioning

confidence: 99%

Comparative Study on the Properties of Epoxy Derived from Aromatic and Heteroaromatic Compounds: The Role of Hydrogen Bonding

Liu

Zhao²,

Peng

et al. 2020

Ind. Eng. Chem. Res.

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“…The theory and application of calorimetry for the absolute determination of purity were originally reported by Johnston and Giauque (<?). Other workers have applied this method to systems where the impurity is liquidsoluble and solid-insoluble (2,(8)(9)(10). Detection of a liquid-soluble, solidsoluble impurity has been described…”

Section: Literature Citedmentioning

confidence: 99%

Adiabatic Calorimeter for Determination of Cryoscopic Data

Mastrangelo¹

1957

Anal. Chem.

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“…Since, from Equation 1the melting point depression is directly related to the mole fraction of impurity, then T" -T = y(To -T>) (3) It is apparent from Equation 3 that a plot of the reciprocals of the fractions melted against the corresponding equilibrium temperatures gives a straight line. Extrapolation of this line to 1/F = 1 and 1/F = 0 gives tiie melting point of the sample, T\, the melting point of the pure compound, To, respectively, and the slope of the line gives the desired melting point depression.…”

Section: Theorymentioning

confidence: 99%

Calorimetric Determination of Purity: Design and Operation of a Small Adiabatic Calorimeter

Tunnicliff¹,

Stone²

1955

Anal. Chem.

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An adiabatic calorimeter has been developed for determination of the purity of the reference compounds required for spectroscopic investigations. Two interchangeable calorimeters with volumes of 0.5 and 5 ml. are used. A complete determination, including calculations, usually requires less than 4 hours. Although the purity determination is based on the measurement of the melting point depression, this method, unlike conventional melting point methods, does not require a previous determination of the heat of fusion and the melting point of the pure compound. Instead, the method determines these quantities as part of the analysis. The calorimeter is used to measure the equilibrium temperature of the sample as a function of heat input as it passes from the solid state to the liquid state.

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Melting Point Calorimeter for Purity Determinations

Cited by 17 publications

References 11 publications

Comparative Study on the Properties of Epoxy Derived from Aromatic and Heteroaromatic Compounds: The Role of Hydrogen Bonding

Comparative Study on the Properties of Epoxy Derived from Aromatic and Heteroaromatic Compounds: The Role of Hydrogen Bonding

Adiabatic Calorimeter for Determination of Cryoscopic Data

Calorimetric Determination of Purity: Design and Operation of a Small Adiabatic Calorimeter

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