Temperature sweep experiment during heating

Mechanical Properties. Dynamic mechanical properties were determined both in torsion and tension. For torsional modulus measurements, a rectangular sample with dimensions of 45 by 12.5 mm was cut from the extruded sheet. Then the sample was mounted on the Rheometrics Mechanical Spectrometer (RMS 800) using the solid fixtures. The frequency of oscillation was 10 rad/sec and the strain was 0.1% for most samples. The auto tension mode was used to keep a small amount of tension on the sample during heating. In the temperature sweep experiments the temperature was raised at a rate of 5°C to 8°C per minute until the modulus of a given sample dropped remarkably. The elastic component of the torsional modulus, G, of the samples was measured as a function of temperature. For the dynamic tensile modulus measurements a Rheometrics Solid Analyzer (RSA II) was used. The frequency used was 10 Hz and the strain was 0.5 % for all tests. 

Figure 8.15 Log G versus log G" plots for a highly asymmetric solvent-cast SIS triblock copolymer (SIS-110) specimen during heating at various temperatures (°C) (O) 140, (A) 151, ( ) 155, (V) 160, (O) 162, (O) 164, ( ) 166, (A) 168, ( ) 170, (T) 172, ( ) 174, m 180, (C) 190, (A) 200, (H) 202, (V) 204, ( ) 206, (O) 208, (A) 210, (11) 212, and (V) 214. Prior to the rheological measurements, the specimen was annealed at 110 °C for 3 days. The inset describes the temperature dependence of G obtained from the isochronal dynamic temperature sweep experiment at < = 0.01 rad/s during heating. (Reprinted from Choi et al.. Macromolecules 36 7707. Copyright 2(X)3, with permission from the American Chemical Society.)...

Figure 8.23 gives the tempa ature dependence of G during the isochronal dynamic temperature sweep experiments at > = 0.01 rad/s in the heating process for highly asymmetric SI diblock copolymer SI-7/29 (M = 3.6 x 10", — 1.03, —... 

Figure 8.23 Isochronal dynamic temperature sweep experiments for a highly asymmetric SI diblock copolymer SI-7/29 at = 0.01 rad/s during heating (O) before annealing and (V) after annealing at 95 °C for 15 days. (Reprinted from Yamaguchi et al., Macromolecules 32 7696. Copyright 1999, with permission from the American Chemical Society.)...

Figure 10.15 Plots of (a) logG versus log co and (b) log G" versus log co for an ester-based MDI/BDO/PTMA TPU specimen during frequency sweep experiments in the heating cycle at various temperatures CC) (O) 110, (A) 120, ( ) 130, (V) 140, (O) 145, (O) 150, ( ) 155, (A) 160, ( ) 170, (T) 180, and ( ) 190. A single specimen prepared by injection molding at 180 °C was employed for the entire experiment. (Reprinted from Yoon, Doctoral Dissertation at the University of Akron. Copyright 2000, with permission from PU Joong Yoon.)...

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