Dielectric properties of isomeric phenyl propanols
作者:
GyanP. Johari,
Walter Dannhauser,
期刊:
Physics and Chemistry of Liquids
(Taylor Available online 1972)
卷期:
Volume 3,
issue 1
页码: 1-11
ISSN:0031-9104
年代: 1972
DOI:10.1080/00319107208084084
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The dielectric constant and loss of 1-phenyl-1-, 1-phenyl-2-, 2-phenyl-2-, and 3-phenyl-l-propanol have been measured as a function of temperature forf< 0.5 MHz. The equilibrium polarization depends markedly on the proximity of the phenyl and hydroxyl groups, apparently as a steric factor and not because of any specific OH-phenyl interaction. Dielectric relaxation in these liquids can be described in terms of overlapping Debye regions but for the most sterically hindered species the regions overlap so closely that the Davidson-Cole skewed-arc function becomes a more useful description. Activation energies depend on the degree of steric hindrance; this suggests that H-bond breaking is not the rate determining step in the relaxation mechanism
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