Abstract
Dielectric relaxation measurements have been performed to study effect of the molecular structure on the primary and secondary relaxations in two materials with very similar structure: diisooctyl phthalate (DIOP) and diisooctyl maleate (DIOM). The dielectric spectra were measured over ten decades of frequency and a broad range of temperature. The results show that the temperature dependence of the α-relaxation times cannot be described by a single Vogel–Fulcher–Tammann equation and the temperature dependence of the β-relaxation times in the glassy state obey the Arrhenius law with different activation energies, i.e., E A /k = 4231 K and E A /k = 2917 K for DIOP and DIOM, respectively. Moreover, third relaxation process visible as an excess wing of the high frequency part of the α loss peak was identified in dielectric spectra of DIOM.
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Pawlus, S. et al. (2007). Influence of Differences in Molecular structure on Behavior of and β Relaxation Processes in Diisooctyl Maleate. In: Rzoska, S.J., Mazur, V.A. (eds) Soft Matter under Exogenic Impacts. NATO Science Series II: Mathematics, Physics and Chemistry, vol 242. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-5872-1_10
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DOI: https://doi.org/10.1007/978-1-4020-5872-1_10
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