J. Mater. Sci. Technol. ›› 1995, Vol. 11 ›› Issue (3): 222-228.

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Dielectric Properties of Some Aldehydes

I.M.El-Anwnr and I.Z.Selim (Physical Chemistry Dept., National Research Centre, Dokki, Cairo, Egypt)A.A.Foad(Faculty of Science, Helwan University, Helwan, Cairo, Egypt)   

  • 收稿日期:1995-05-28 修回日期:1995-05-28 出版日期:1995-05-28 发布日期:2009-10-10

Dielectric Properties of Some Aldehydes

I.M.El-Anwnr and I.Z.Selim (Physical Chemistry Dept., National Research Centre, Dokki, Cairo, Egypt)A.A.Foad(Faculty of Science, Helwan University, Helwan, Cairo, Egypt)   

  • Received:1995-05-28 Revised:1995-05-28 Online:1995-05-28 Published:2009-10-10

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摘要： 1.IntroductionTheinbalanceinelectrondensityinthecarbonylgroupofthealdehydes,Ieadstoapermanentdipoleandalargemomentvalueduetoalargecontribu-tionfromapolarstructure[1l.Theriseinmomentproducedbysubstitutingthefirstmethylgroupinformaldehyde,ismarkedlygreater[']thanthatpro-ducedbyintroducingthesecondmethylgroup.Thedipolemomentsofaldehydesareaffectedbysubstituents,thedipolelnomentsoftrichloro-andtr....

Abstract: The apparent solution dipole moment, μ, the association factor S, and the correlation parameter g for some aldehydes are calculated at different temperatures. The results are discussed and compared with previous results. The dielectric constant ε' and loss ε" for the investigated aldehydes were measured with different frequencies at 10-50℃. The variation of permittivities with both temperature and frequency is discussed. The relaxation times τ, for some aldehydes were calculated at different temperatures and its values were used in the calculation of the thermodynamic parameters △H and △S