Analysis of time-dependent non-linear stress-growth data for shear and elongational flow of a low-density branched polyethylene melt

1976 ◽  
Vol 15 (2) ◽  
pp. 136-142 ◽  
Author(s):  
M. H. Wagner
Keyword(s):  
Elongational Flow ◽  
Time Dependent ◽  
Low Density ◽  
Growth Data ◽  
Stress Growth ◽  
Branched Polyethylene ◽  
Non Linear ◽  
Polyethylene Melt

Film Casting of a Low Density Polyethylene Melt

2001 ◽  
Vol 20 (5) ◽  
pp. 366-376 ◽  
Author(s):  
Kathleen Canning ◽  
Baigui Bian ◽  
Albert Co
Keyword(s):  
Low Density Polyethylene ◽  
Low Density ◽  
Film Casting ◽  
Polyethylene Melt

Test of Strain-Time Correspondence Principle with Gel-Containing Elastomers

1986 ◽  
Vol 59 (2) ◽  
pp. 305-314 ◽  
Author(s):  
N. Nakajima ◽  
E. R. Harrell
Keyword(s):  
Large Deformation ◽  
Correspondence Principle ◽  
Small Deformation ◽  
Complex Viscosity ◽  
Shear Stresses ◽  
Growth Data ◽  
Stress Growth ◽  
Linear Viscoelastic ◽  
The Difference ◽  
Linear Viscoelastic Theory

Abstract With four NBR samples and one EPR, oscillatory measurements and stress-growth measurements were performed, the former being at very small deformation and the latter leading to large deformation. The Rheometrics mechanical spectrometer was used with a cone-plate fixture. The temperature was 100°C. The stress-growth data of NBR's, converted to complex viscosity-frequency data through the application of stress-time correspondence principle, were in good agreement with those observed in the oscillatory measurement. Thus, the stress-growth data including the large deformation were “linearized” to form a master curve. With the EPR sample, such a linearization was not necessary. The stress-growth data were adequately treated with the linear viscoelastic theory up to shear stresses approaching the steady state. The difference in behavior between the NBR's and EPR is caused by differences in type and extent of long branching and gel present in the samples.

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