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- W2000903859 abstract "The slow secondary (β) process of 1,1′-bis (4-methoxyphenyl) cyclohexane and phenolphthalein dimethylether has been investigated by dielectric spectroscopy. New experimental results about the pressure dependence of the two processes are reported, as well as new data about the dependence of the characteristic relaxation frequency on the cooling rate used to vitrify the system in isobaric conditions. Previous investigations on these systems suggested that the first one is not a true Johari-Goldstein relaxation and both processes should originate from the flip flop motion of the phenyl ring. The results herein reported evidence that the characteristic frequency of the β process of phenolphthalein dimethylether is more sensitive to pressure variation and to the vitrification procedure than that of 1,1′-bis (4-methoxyphenyl) cyclohexane. Such results suggest an intermolecular origin for the secondary process in phenolphthalein dimethylether and an intramolecular origin for the other one, which do not completely agree with the previous interpretation. We evidence that the microscopic mechanism at the basis of these two processes is still an open question, which should be debated on the basis of new experimental investigations." @default.
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- W2000903859 date "2007-09-20" @default.
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- W2000903859 title "New experimental evidence about secondary processes in phenylphthalein-dimethylether and 1,1′-bis(p-methoxyphenyl)cyclohexane" @default.
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- W2000903859 doi "https://doi.org/10.1063/1.2771169" @default.
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