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  • Stavová rovnice Simha-Somcynskeho byla použita k výpočtu volno-objemového parametru h z tlak-objem-teplota (PVT) závislostí osmi polymerů. Predikovaná variance parametru h s teplotou a tlakem byl potvrzen positron anihilační spektroskopií a odpovídající shodabyla nalezena pro h(P=konstantní)=h(T) stejně jako h(T=konstantní)=h(P). Kapilární smyková viskozitní data (v) stejných polymerů pro tři různé teploty a šest tlaků byla vynesena jako funkce log(v) versus 1/h, kdy h bylo vypočítáno pro hodnoty tlaku a teploty experimentálních podmínek viskozitních měření. Dříve nalezená %22master křivka%22 pro silikonové oleje v širokém rozpětí teploty a tlaku byla shledána jako nepoužitelná pro taveniny polymerů. (cs)
  • The Simha-Somcynsky (S-S) equation of state (eos) was used to compute the free volume parameter, h, from the pressure-volume-temperature (PVT) dependencies of eight molten polymers. The predicted by eos variation of h with T and P was confirmed by the positron annihilation lifetime spectroscopy; good agreement was found for h(P=constant)=h(T) as well as for h(T=constant)=h(P). Capillary shear viscosity (η) data of the same polymers (measured at three temperatures and six pressures up to 700 bars), were plotted as logη vs 1/h, the latter computed for T and P at which η was measured. In previous works, such a plot for solvents and silicone oils resulted in a %22master curve%22 for the liquid, in a wide range of T and P. However, for molten polymers, no superposition of data onto a %22master curve%22 could be found.
  • The Simha-Somcynsky (S-S) equation of state (eos) was used to compute the free volume parameter, h, from the pressure-volume-temperature (PVT) dependencies of eight molten polymers. The predicted by eos variation of h with T and P was confirmed by the positron annihilation lifetime spectroscopy; good agreement was found for h(P=constant)=h(T) as well as for h(T=constant)=h(P). Capillary shear viscosity (η) data of the same polymers (measured at three temperatures and six pressures up to 700 bars), were plotted as logη vs 1/h, the latter computed for T and P at which η was measured. In previous works, such a plot for solvents and silicone oils resulted in a %22master curve%22 for the liquid, in a wide range of T and P. However, for molten polymers, no superposition of data onto a %22master curve%22 could be found. (en)
Title
  • Free volume dependence of polymer viscosity
  • Free volume dependence of polymer viscosity (en)
  • Volno-objemová závislost viskozity polymerů (cs)
skos:prefLabel
  • Free volume dependence of polymer viscosity
  • Free volume dependence of polymer viscosity (en)
  • Volno-objemová závislost viskozity polymerů (cs)
skos:notation
  • RIV/70883521:28110/07:63505489!RIV08-AV0-28110___
http://linked.open.../vavai/riv/strany
  • 479-494
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  • P(IAA2060202)
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  • 4
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  • RIV/70883521:28110/07:63505489
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  • PVT behavior; Equation-of-state; Free volume; Viscosity; Temperature and pressure dependence (en)
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  • DE - Spolková republika Německo
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  • Rheologice Acta
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  • 46
http://linked.open...iv/tvurceVysledku
  • Sedláček, Tomáš
  • Utracki, Leszek
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  • 0035-4511
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  • 28110
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