Temperature dependence of tan

Figure I5B. Temperature dependence of tan S at 110 Hz. Effect of variations in composition on properties of triblock copolymers of H1B1 as compared to those of HB. All films are press-quenched.

Fig. 32 Temperature dependence of tan 5, at 3 Hz, for TMBPA-PC and BPA-PC blends. As TMBPA-PC content increases, each curve is shifted by 0.01 to get a clearer picture (from [28])...

The temperature dependence of tan S at 1 Hz in the glassy state for the various xTyl -y copolyamides [60] is shown in Fig. 89. Three secondary transitions y, P and co, in the order of increasing temperature, are clearly observed. 

Figure 2. Temperature dependence of tan S for four IPN s El, 74 PEA/26 PS E4, 72 PEA/28 PMMA II, 25 PS/75 PEA 14, 27 PMMA/73 PEA. The components of the IPN s were synthesized in the order as listed. (Reproduced from Ref. 11. Copyright 1972 American...

Examples of the dependence of s, s, and tan d on temperature, frequency, and impurity level are given in Figs. 1-3. For a microwave frequency of about 3.5-4.0 GHz, the temperature dependence of s for three aluminas of differing purity (the purities are 99.5%, 99%, and 90-95% alumina for the topmost, middle, and bottom curves, respectively) is shown in Fig. 1. Fig. 2 shows the dramatic temperature dependence of tan 6 for the same three aluminas, with the onset of the rapid rise in tan 8 occurring at increasingly lower temperatures as the concentration of impurities increases. Fig. 3 demonstrates the sensitivity of s to changes in frequency for magnesium oxide at seven different temperatures from 25° C to 1200°C. ... 

Fig. 2 The temperature dependence of tan 8 for polycrystalline alumina with the following purities 99.5% (bottom curve), 99% (middle curve), and 90-95% (topmost curve). (From...

Fig. 3. The temperature dependence of tan <5 at a frequency of 1 Hz for the zinc salt of ethylene ionomers. These ethylene ionomers are copoly(ethylene-methacrylic acid) with an acid content of 0.054 and various degrees of neutralization (E-0.054MAA-xZn x is the degree of neutralization).

Figure 5-13. Temperature dependence of tan 8 for polymethyl methacrylate showing the a and P relaxations. [After L. E. Nielsen, Mechanical Properties of Polymers, Reinhold, new York, 1962, p. 178.]...

Figure 5-15. Temperature dependence of tan 8 for copolymers of methyl methacrylate and cyclohexyl methacrylate. Open circles are pure polymethyl methacrylate. [After J. Heijboer, Kolloid-Z. 171 7 (1960), by permission of Dr. Dietrich Steinkopff Verlag.]...

Figure 9.33 Temperature dependence of tan S around the a-relaxation process for iPP crystallized at various temperatures. (From Reference 64 with permission from Society of Rheology Japan.)...

Figure 29. Temperature dependence of tan S for a CVD diamond sample measured at 145 GHz compared with sapphire [75],...

Preliminary measurements of the temperature dependence of the dielectric properties of polycrystalline CVD diamond are available. Figures 29 and 30 show the temperature dependence of tan 5 and e r measured at 145 GHz for a CVD diamond sample compared to sapphire [75]. In this temperature range (100-370 K), the dielec-... 

Figure 7 shows the temperature dependence of tan 8 of nylon 6 films the melt-pressed and quenched, the melt-pressed and slowly-cooled, and the balance-type (two axis expanded) commercial films. The packaging of molecule becomes tight in that order. The tan 5 curves of these specimens show different behaviors, but these curves include at least two relaxation peaks. One is near 40°C, and the other near 90"C the former corresponds to the Tg, and the latter corresponds to the relaxation of the crystalline region. ... 

Figure 6.18 shows the temperature dependence of tan 5 of neat NR and NR composites. The position of the tan 8 peak in the tan 5-temperature curve can... 

The intrinsic origin of damping constant y in Eq. 3 is the inharmonic terms in the crystal s potential energy by which the phonons of infrared active modes decay into the thermal phonons. As the phonon energy follows the Planck distribution, y, and tan, increase proportionately to temperature when the abnormality such as phase transition does not occur in the observed temperature range. Figure 5.1.16 shows the temperature dependence of tan 5 from 30 to 300 K. 

Examination of the temperature dependences of E and tan 8 of as-spun and annealed CPE-1 fibers (Figure 1, curves 1 and 2 ) reveals that solid CPE-1 shows relaxational transitions in temperature intervals from -60 to +20°C and from 110 to 230°C. In these temperature intervals, E tends to decrease. In the temperature dependence of tan 8, the above transitions are associated with maxima. At 250 °C, as-spun CPE-1 fibers start to flow, which is accompanied by a sharp drop in E and increase in tan 8. Such behavior is characteristic of aU the as-spun CPE-1 fibers, independent of their specific viscosity. 

Figure 7.57 Temperature dependence of tan d curves for sericin-poly(vinyl alcohol) (PVA) blend films [43]...

Figure 9.10 Temperature dependence of tan (5 in a cold-drawn and annealed HDPE sheet in different directions at 50 Hz. (Reproduced with permission from Stachurski and Ward, J.

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