Dielectric Relaxation Studies of Oligether of Ethylene Glycol at Microwave Frequencies

Purohit, H. D.; Sengwa, R. J.

doi:10.1246/bcsj.64.2030

Cited by 17 publications

(5 citation statements)

References 9 publications

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“…The values for DEGME are greater than those of DEGEE, ranging over all the temperature and pressure intervals from (413 to 450) MPa and from (388 to 434) MPa, respectively. The dipole moments at 308.15 K for both glycol ethers are also high but very close, μ = 2.78 D for DEGEE and μ = 2.75 D for DEGME. This means that the insertion of a methylene group (nonpolar) reduces the internal pressure.…”

Section: Resultsmentioning

confidence: 86%

Liquid Density Measurements of Diethylene Glycol Monoalkyl Ethers as a Function of Temperature and Pressure

et al. 2004

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In this work, 144 new experimental density values are reported for diethylene glycol monomethyl ether (DEGME) and diethylene glycol monoethyl ether (DEGEE) in the compressed liquid phase between 283.15 K and 353.15 K for pressures up to 25 MPa. The density measurements were performed with an Anton Paar DMA 60/512P vibrating tube densimeter and then correlated by using a Tammann−Tait equation with standard deviations of 1 × 10-4 g·cm-3. The isothermal compressibility, the isobaric thermal expansivity, and the internal pressure have been determined from the density data. The isothermal compressibility and isobaric thermal expansivity values increase with the size of the diethylene glycol monoalkyl ether molecule. The internal pressure values are lower for DEGEE than for DEGME.

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Section: Resultsmentioning

confidence: 86%

Liquid Density Measurements of Diethylene Glycol Monoalkyl Ethers as a Function of Temperature and Pressure

et al. 2004

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“…Figure 1.7 gives relaxation frequency range for classical organic functions: alkanes [33,34], alcohols [35][36][37][38][39], alcohol ether [40], acid chlorides [41,42], esters [43,44], aliphatic [45][46][47][48][49][50][51][52][53][54] and aromatic halogens [55,56], aliphatic [57,58], aromatic ketones [59], nitriles [60], and aliphatic [61,62] and aromatic amines [63].…”

Section: Effect Of Imaginary Part: Dielectric Lossesmentioning

confidence: 99%

Microwave‐Material Interactions and Dielectric Properties, Key Ingredients for Mastery of Chemical Microwave Processes

Stuerga¹

2006

Microwaves in Organic Synthesis

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The main focus of the revised edition of this first chapter is essentially the same as the original -to explain in a chemically intelligible fashion the physical origin of microwave-matter interactions and, especially, the theory of dielectric relaxation of polar molecules. This revised version contains approximately 60% new material to scan a large range of reaction media able to be heated by microwave heating. The accounts presented are intended to be illustrative rather than exhaustive. They are planned to serve as introductions to the different aspects of interest in comprehensive microwave heating. In this sense the treatment is selective and to some extent arbitrary. Hence the bibliography contains historical papers and valuable reviews to which the reader anxious to pursue particular aspects should certainly turn.It is the author's conviction, confirmed over many years of teaching experience, that it is much safer -at least for those who rate not trained physicists -to deal intelligently with an oversimplified model than to use sophisticated methods which require experience before becoming productive. Because of comments about the first edition, however, the author has included more technical material to enable better understanding of the concepts and ideas. These paragraphs could be omitted, depending on the level of comprehension of the reader. They are preceded by two different symbols -k for TOOLS and j for CONCEPTS.After consideration of the history and position of microwaves in the electromagnetic spectrum, notions of polarization and dielectric loss will be examined. The orienting effects of electric fields and the physical origin of dielectric loss will be analyzed, as also will transfers between rotational states and vibrational states within condensed phases.Dielectric relaxation and dielectric losses of pure liquids, ionic solutions, solids, polymers and colloids will be discussed. Effect of electrolytes, relaxation of defects within crystals lattices, adsorbed phases, interfacial relaxation, space charge polarization, and the Maxwell-Wagner effect will be analyzed. Next, a brief overview of 1 thermal conversion properties, thermodynamic aspects, and athermal effects will be given.

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“…Microwave dielectric relaxation studies in non‐polar solvents are very useful in determining the flexibility of chains, mobility of the polymer segments, internal group rotation and steric hindrance to the internal rotation due to hydrogen bonding. Earlier, in this laboratory1, 10–16 extensive dielectric relaxation studies were carried out at microwave frequencies on the associating molecules of different homologous series. Dipole moment and dielectric relaxation studies of poly(ethylene glycol)s1, 13, 14, 16 (PEGs) and their binary mixtures were investigated in dilute benzene and carbon tetrachloride solutions to understand the molecular dynamics and inter‐ and intra‐ molecular hydrogen bonding with different environments regarding their molecular conformations in a quasi‐isolated state.…”

Section: Introductionmentioning

confidence: 99%

Dielectric properties of low molecular weight poly(ethylene glycol)s

2000

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Dielectric Relaxation Studies of Oligether of Ethylene Glycol at Microwave Frequencies

Cited by 17 publications

References 9 publications

Liquid Density Measurements of Diethylene Glycol Monoalkyl Ethers as a Function of Temperature and Pressure

Liquid Density Measurements of Diethylene Glycol Monoalkyl Ethers as a Function of Temperature and Pressure

Microwave‐Material Interactions and Dielectric Properties, Key Ingredients for Mastery of Chemical Microwave Processes

Dielectric properties of low molecular weight poly(ethylene glycol)s

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