Schematic of the extensional viscosity fixture (EVF).
Time dependence of and for a PTFE sample with thickness, during (a) heating from to at maximum heating rate, and (b) cooling from to at cooling rate.
Elongational viscosity curves of BR200 at , after different delay times before stretching at . One run from RME is also included.
Transient elongational viscosity at with various delay times before stretching at .
Determination of and data reproducibility for BR200 stretched at and .
Sample temperature profile in EVF and plate-plate geometries during cooling from to , using different temperature control modes.
Viscosity curves obtained from shearing/stretching experiments at shear/strain and , following different temperature control modes but comparable temperature profiles as given in Fig. 6.
Transient elongational viscosity curves for BR200 stretched with various strain rates, at (a) and (b) .
(a) Comparison of MSF simulation results and experimental data for BR200 at , and (b) determination of crystallization onset time.
EIC onset times at 97 and .
(a) EIC and SIC onset time data for BR200 at . Crosses are data points obtained by concentric cylinder (Couette) rheometer [Hadinata et al., 2005 (accepted)]. (b) EIC and SIC onset time data for BR200 at .
Total strain at various deformation rates for (a) EIC, and (b) SIC of BR200 at 97 and .
Temperature-invariant representation of EIC onset time data obtained at 97 and and strain rates , compared with SIC temperature-invariant curve.
Shear viscosity curves of BR200 sheared at and after being annealed at different conditions.
Elongational viscosity curves of BR200 stretched at and after being annealed at different conditions.
Physical properties of BR200. First heating run refers to the as-received sample, whereas the second heating run refers to the reheating after the sample has been melted at and cooled to (differential scanning calorimetry cooling/heating rate was ).
True sample temperature with regard to the imposed after steady-state conditions had been reached. The accuracy for setting is .
Relaxation spectrum of BR200 at , with as the number of modes.
Temperature protocol using as controller, to mimic the sample temperature profile from EVF experiments in shear (plate-plate geometry).
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