A linear polystyrene melt with broad molecular weight distribution (CAS 0993-53-6 from Aldrich) was characterized in extensional flow using a filament stretching rheometer. A series of measurements were performed, including (1) the startup of uniaxial extensional flow until steady state; (2) the strain controlled reversed (i.e., biaxial) flow following the startup of uniaxial flow; and (3) stress relaxation (i.e., keeping the strain unchanged) also following the startup of uniaxial flow. The measurements were compared with the model by Narimissa and Wagner [J. Rheol. 60, 625–636 (2016)]. Good agreements at low extension rates and low strain values were observed. Higher deviations were observed at high rates under steady state conditions as well as during stress relaxation and reversed flow.
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September 2019
Research Article|
September 01 2019
Extensional flow dynamics of polystyrene melt
Qian Huang
;
Qian Huang
1
Department of Chemical and Biochemical Engineering, Technical University of Denmark
, DK-2800 Kgs. Lyngby, Denmark
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H. K. Rasmussen
H. K. Rasmussen
a)
2
Department of Mechanical Engineering, Technical University of Denmark
, DK-2800 Kgs. Lyngby, Denmark
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a)
Author to whom correspondence should be addressed; electronic mail: hkra@mek.dtu.dk
J. Rheol. 63, 829–835 (2019)
Article history
Received:
May 14 2019
Accepted:
August 06 2019
Citation
Qian Huang, H. K. Rasmussen; Extensional flow dynamics of polystyrene melt. J. Rheol. 1 September 2019; 63 (5): 829–835. https://doi.org/10.1122/1.5110027
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