On the rheological characterisation of linear and branched metallocene polypropylenes prepared by reactive extrusion process

0096957 - ÚH 2008 RIV DK eng C - Konferenční příspěvek (zahraniční konf.)
Pivokonský, Radek - Zatloukal, M. - Filip, Petr - Tzoganakis, C.
On the rheological characterisation of linear and branched metallocene polypropylenes prepared by reactive extrusion process.
[K reologické charakterizaci lineárních a rozvětvených zpracovaných metalocenových polypropylenů.]
PPS07 EA: Europe/Africa Regional Meeting 2007. Copenhagen: Hexagon Holding ApS, 2007, s. 1-8. ISBN 87-89753-56-9.
[PPS07 EA: Europe/Africa Regional Meeting 2007. Gothenburg (SE), 28.08.2007-30.08.2007]
Grant CEP: GA AV ČR IAA200600703
Výzkumný záměr: CEZ:AV0Z20600510
Klíčová slova: constitutive equations * polymer melts * shear flow * elongational flow
Kód oboru RIV: BK - Mechanika tekutin

Measurements of the rheological characteristics (dynamic properties - storage G’ and loss G’’ moduli and transient uniaxial extensional viscosity) were carried out for pure (linear) metallocene polypropylene (mPP), and processed mPP with (weight percentage of peroxide 0.01%) and without peroxide. For proper determination of a temperature field in the close vicinity of a sample during measurement of elongational viscosity it was necessary to insert two thermocouples into the ARES 2000 oven equipped with the SER Universal Testing Platform as a transition of these materials from a solid-like state to apparent fluidity is within a couple of degrees. For the branching level characterisation of mPP the XPP model was used. The XPP model was able to fit both steady shear and uniaxial extensional viscosities in a sufficient agreement with the measured data.

Byla provedena měření reologických charakteristik pro tři typy materiálů: čistý (lineární) metallocenový polypropylen (mPP) a zpracovaný mPP s peroxidem a bez peroxidu. Byla ověřena možnost použití XPP modelu pro jednotlivé typy měřených materiálů.
Trvalý link: http://hdl.handle.net/11104/0156206