Dynamic temperature sweep experiments

Fig. 20.7 Variations of lq l with temperature during isochronal dynamic temperature sweep experiments at a = 0.1 rad/s for (a) open circle) PyHQ12 and open triangle) PSHQ12, and for (b) open circle) PyHQ12/Cloisite SOB nanocomposite, open triangle) PyHQ12/Cloisite 15A nanocomposite, and open square) PSHQ12/Cloisite SOB nanocomposite (Reprinted with permission from Huang and Han (2006a). Copyright 2006 American Chemical Society)...

Figure 8.9 Temperature dependence of G for a highly asymmetric SIS triblock copolymer specimen having a 0.18 weight fraction of PS block (Vector 4111, Dexco Polymers Company), which was annealed at 140 °C for 2 days prior to the isochronal dynamic temperature sweep experiments at an angular frequency of 0.01 rad/s in the heating process. (Reprinted from Sakamoto et al., Macromolecules 30 1621. Copyright 1997, with permission from the American Chemical Society.)...

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.)...

In this section, we present the effect of thermal history on the oscillatory shear rheometry of block copolymers. We will show that the occurrence of a minimum in G in the isochronal dynamic temperature sweep experiment does not necessarily signify OOT for highly asymmetric block copolymers instead, it sometimes reflects imperfect bcc spheres, as determined by SAXS and TEM, due to an insufficient annealing of a specimen. Here, we will show that a minimum in G, observed for an unannealed specimen in the isochronal dynamic temperature sweep experiment, may disappear completely when the specimen is annealed for a sufficiently long time at an elevated temperature below the TmoT of highly symmetric SI diblock copolymer. 

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 8.32 Temperature dependence of G obtained from isochronal dynamic temperature sweep experiments at = 0.1 rad/s for ( ) dPS-fc/ock-PnPMA-H with = 5.33 x 10, (O) dPS-fc/ocUP PMA-L with = 4.5 x 10, (A) dPS-WocUPnPMA-BH composed of 55 wt % dPS-Wocyfe-P PMA-H and 45 wt % dPS-Nocfe-PwPMA-L, ( ) dPS-Wocfe-PnPMA-BM composed of 50 wt % dPS-Wock-P PMA-H and 50 wt % dPS-Wucfc-PnPMA-L, and (V) dPS-l Zock-PnPMA-BL composed of 45 wt % dPS-block-PnPMA-H and 55 wt % dPS-Wock-PnPMA-L. (Reprinted from Ryu et al., Macromolecules 36 2894. Copyright 2003, with permission from the American Chemical Society.)...

Temperature Dependence of Dynamic Moduli of TPU during Isochronal Dynamic Temperature Sweep Experiment... 

Figure 12.48 compares logG versus logG" plots of S1-14/3-OH with those of 95/5 (SI-14/3-OH)/Cloisite 30B nanocomposite at various temperatures, in which the insets show the results of the isochronal dynamic temperature sweep experiments at... 

Figure 12.52 describes the temperature dependence of dynamic storage modulus G during the isochronal dynamic temperature sweep experiment at an angular frequency (ty) of 0.1 rad/s for PS, PS-t-COONa, (PS-t-COONa)/Cloisite 20A nanocomoposite, and (PS-t-COONa)/Cloisite 30B nanocomposite. The following observations are worth noting in Figure 12.52. Not only is the magnitude of G for PS-t-COONa much larger than that for neat PS, but also the values of G for PS-t-COONa decrease slowly, as compared with the values of G for neat PS, with increasing temperature. We attribute this observation to the formation of ionic clusters in PS-t-COONa. It has been reported...

Figure 12.56 Variations of G with temperature during the isochronal dynamic temperature sweep experiments at CO = 0.1 rad/s for (O) SI-t-COONa,...

Fig. 38 Variations of dynamic storage modulus G/ with temperature during the isochronal dynamic temperature sweep experiments at co = O.lrad/s for (open circle) SI-2, open triangle) IS-t-COONa, open square) (IS-t-COONa)/Cloisite SOB nanocomposite, and open inverted triangle) (IS-t-COONa)/Cloisite 20A nanocomposite, (Reprinted from Zha et al. [55], Copyright 2005, with permission from the American Chemical Society)...

Also, given in the inset of Fig. 22 are plots of isochronal dynamic temperature sweep experiments for SIS-110. It is seen in the inset of Fig. 22 that values of G go through a minimum at about 120°C, which corresponds to Toot from hexago-nally packed cylindrical microdomains to spherical mircodomains in a bcc lattice, followed by a very slight maximum, and then start to decrease precipitously at about 165°C, which corresponds to Tldot It should be pointed out that the 7bMT of SIS-110 cannot be determined from the isochronal dynamic temperature sweep experiments. 

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