Measurement of elongational viscosity of polymer melts using SER Universal Testing Platform

0376037 - ÚH 2013 RIV DE eng J - Článek v odborném periodiku
Filip, Petr - Švrčinová, Petra
Measurement of elongational viscosity of polymer melts using SER Universal Testing Platform.
Applied Rheology. Roč. 22, č. 1 (2012), s. 14776. ISSN 1430-6395. E-ISSN 1617-8106
Grant CEP: GA ČR GA103/08/1307; GA ČR GA103/09/2066
Výzkumný záměr: CEZ:AV0Z20600510
Klíčová slova: elongational viscosity * SER Universal Testing Platform * polymer melts * LDPE
Kód oboru RIV: BK - Mechanika tekutin
Impakt faktor: 1.226, rok: 2012
http://www.ar.ethz.ch/TMPPDF/23074299892.48/ApplRheol_22_14776.pdf

The measurement of elongational viscosity still evokes a series of problems in comparison with the relatively well-established measurement of shear viscosity. Recently new techniques have appeared enabling measurement of elongational viscosity with the samples for which the aspect ratios of their geometrical shapes (i.e. length vs. width (diameter)) can attain moderate values, i.e. not necessarily of a longitudinal character as in the case of earlier techniques. The aim of this contribution is to experimentally demonstrate the invariantness of transient uniaxial elongational viscosity measured with respect to a rectangular shape and thickness of LDPE samples using a SER Universal Testing Platform fixed in an Anton Paar MCR 501 host system. The width of the samples was varied within the range 2.1-12.7 mm and thickness altered within 0.1-1 mm. An advantage of fixing polymer samples directly to both drums (if possible) over the application of clamps is documented.
Trvalý link: http://hdl.handle.net/11104/0006939