73. Molecular polarisability: the anisotropy of the carbon–oxygen link

Fèvre, R. J. W. Le; Sundaram, A. Meenakshi; Pierens, R. K.

doi:10.1039/jr9630000479

Cited by 38 publications

(2 citation statements)

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“…Relative deviation, 100%·(ρ this work – ρ lit )/ρ this work , of pure 1,3-dioxolane density measured in this work from similar literature data at several temperatures: black ■, Le Fevre et al; black ●, Groller et al; black ▲, Inglese et al; black ▼, Francesconi and Comelli; black ⧫, Francesconi et al; black ◀, Francesconi and Comelli; black ▶, Brocos et al; black ★, Comelli et al; red ■, Guzman et al; red ●, Brocos et al; red ▲, Brocos et al. ; red ▼, Gascon et al; − red ⧫, Francesconi et al; red ◀, Kolosnitsyn et al; red ▶, Giner et al; red ★, Calvo et al.…”

Section: Resultssupporting

confidence: 73%

“…The densities of pure 1,3-dioxolane were measured earlier in several papers. ,,,− These results are given in Table . Most of the measurements were carried out at only one temperature of 298.15 K. ,,− ,,,,,, In addition to the studies conducted by Kolosnitsyn et al at five temperatures, other density data were obtained at a maximum of three temperatures.…”

Section: Resultsmentioning

confidence: 99%

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Densities and Volumetric Properties of Water + 1,3-Dioxolane Mixtures at Temperatures of (274.15 to 323.15) K and Ambient Pressure

Egorov

2023

J. Chem. Eng. Data

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The densities of the binary mixture {water (1) + 1,3-dioxolane (2)} were measured using a vibration density meter over the entire range of compositions in the temperature range from (274.15 to 333.15) K at atmospheric pressure. The excess molar volumes, molar isobaric temperature expansions of the mixture, and apparent and partial molar volumes of water and 1,3-dioxolane, including their limiting values, were calculated. The obtained results were compared with the literature data and with those having similar properties of aqueous mixtures of other simple cyclic ethers: oxolane and 1,4-dioxane. The formation of the water + 1,3-dioxolane mixture was shown to be accompanied by a volume decrease at all temperatures. The addition of ether to water led to a negative shift in the temperature corresponding to the maximum mixture density. The concentration dependencies of the partial molar volumes of 1,3-dioxolane were characterized by the absence of a minimum at low concentrations of cyclic ether in the mixture. The limiting partial molar volumes of water and 1,3-dioxolane were smaller than the respective molar volumes and increased as the temperature increased. The temperature coefficient of the limiting molar isobaric expansion of water in 1,3-dioxolane was positive, which indicated that the temperature increase made the solvate shell larger. The negative temperature coefficient of the limiting molar isobaric expansion of 1,3-dioxolane indicates the destruction of the water structure in the immediate environment of the cyclic ether molecule.

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Section: Resultssupporting

confidence: 73%

Section: Resultsmentioning

confidence: 99%

Densities and Volumetric Properties of Water + 1,3-Dioxolane Mixtures at Temperatures of (274.15 to 323.15) K and Ambient Pressure

Egorov

2023

J. Chem. Eng. Data

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Dynamic birefringence of poly(methyl methacrylate)

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1967

J. polym. sci., C Polym. symp.

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The dynamic modulus, strain‐optical coefficient, and stress‐optical coefficient have been measured for conventional poly(methyl methacrylate) (PMMA) in the frequency range 16–10−2.5 cps and at temperatures between −130 and +140°C. Both the α (glass–rubber) relaxation and the β relaxation have been detected in plots of each of these observables, or the appropriate phase angles, against temperature or frequency. The extremely broad mechanical β relaxation suggests a wide distribution of relaxation frequencies. The high‐frequency modes lead to a relaxation of the strain‐optical coefficient while the stress‐optical coefficient remains essentially constant. Conversely, the low‐frequency modes result in a relaxation of the stress‐optical coefficient at constant strain‐optical coefficient. The results are discussed in relation to the polarizability anisotropy of the PMMA repeat unit, and comparisons are made with dielectric data and with earlier dynamic birefringence data obtained for poly(methyl acrylate) (PMA).

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