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References in periodicals archive ?
Figure 3 shows the plot of the complex viscosity versus 1/[omega] at different BTPC concentrations for the data at low frequencies.
At low frequencies the storage modulus of samples with BTPC becomes independent of frequency.
At high frequencies, the loss tangent values are nearly independent of BTPC concentration and decrease with increasing frequency.
Figure 7 shows the master curves of the shear viscosity versus shear rate from data obtained for steady shear flow in a cone and plate rheometer for different temperatures and different BTPC concentrations.
The effect of BTPC concentration on the complex viscosity and the shear viscosity of PVDF/BTPC blends at low frequencies (0.01 < [omega][a.sub.T] < 100 rad/s) and low shear rates (0.01 < [??][a.sub.T] < 10 [s.sup.-1]) are shown in Figure 8.
9a) and a linear least squares fits yields the following How activation energy values for PVDF and its blends: 28.7 kJ/mol (PVDF), 28.4 kJ/mol (0.5% BTPC), 27.6 kJ/mol (1% BTPC), and 27.8 kJ/ mol (3% BTPC).
8 to the data in Figure 9b in temperature range of 200-260[degrees]C are as follows: 7.7 x [10.sup.-3] [K.sup.-1] (PVDF), 7.3 x [10.sup.3] [K.sup.-1] (0.5% BTPC), 8.0 x [10.sup.-3] [K.sup.-1] (1% BTPC), and 9.0 x [10.sup.-3] [K.sup.-1] (3% BTPC).
BTPC is an off-white powder which was found to dissolve in molten PVDF.
The FTIR spectra for the PVDF films prepared with the different weight fractions of BTPC are shown in Figure 11.
X-ray diffraction peaks for the films prepared with pure PVDF and with 1 and 3 wt % BTPC are shown in the Figure 12.
The maximum intensity in a lobe occurs at different scattering angles for the different BTPC concentrations.
The variation of dielectric constant with frequency for PVDF films with different BTPC concentrations is shown in Figure 14.