Alpha-relaxation of a coal tar pitch and temperature-density effects on the viscoelastic parameters analysis
作者： E. Daguerre , F. Nauguier , X. Py
DOI: 10.1016/S0008-6223(98)00083-9
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摘要: Abstract The alpha-relaxation of a coal tar pitch has been experimentally illustrated through typical G′ and G″ isotherms steps tan (δ) peak isochrone. This phenomena identified by means its non-Debye (m ~ 1, n 0.5) non-Arrhenius behaviours. It characterized in terms relaxation temperature Tα time τα compared to A240 petroleum amorphous polymers leading strong similarity between these materials. Moreover, experimental density data have investigated the range 25 400 °C for both pitches using Archimedean method. obtained results were very good agreement with published based on dilatometry. effect time-temperature superposition standard procedure analysed reduced loss modulus shift factors deviations. Temperature-density temperature-viscosity used calculation theoretical which success empirical ones.
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