DSC results

Table 6 DSC Results of Modifiers and Their Blends with PVC...

The results of the tests are plotted in Fig. 4.1 according to Fox and Flory [39] against 1> the inverse molecular mass between crosslinks, which was determined from the rubbery modulus. The two sets of results agree basically, although the DSC results are consistently 8 K lower than the temperatures TXmax, derived from... 

Figure 13, DSC results on surface and center of nonisothermal sample N-2 (cold...

Details are given of ways of obtaining energy from the pyrolysis of disposable syringes. The waxy product was chemically modified with maleic anhydride and tested in the processing of PP/LLDPE blends in a rheometer or twin-screw extruder. Compatibility of components in binary or ternary blends and DSC results are discussed. 35 refs. 

The DSC results do not give information regarding the relative sizes of the phases or the physical blend structure. This information can only be inferred from the mass loss profiles and the amount of water retained in the pores and interconnecting... 

Several calculation methods for establishing reaction kinetics from the scanning DSC results are discussed in the literature [91-97]. Kinetic constants can be obtained from scanning DSC tests under favorable circumstances that include (1) the availability of a sample that even in milligram quantities is truly representative of the process material, and (2) kinetics that are uncomplicated by multiple reactions or by the presence of autocatalysis or inhibitor effects. 

ACKNOWLEDGMENT The assistance at Raychem Corporation of Gloria Merlino in obtaining TGA/DSC results is greatly appreciated. 

In the DTA measurement, an exothermic reaction is plotted as a positive thermal event, while an endothermic reaction is usually displayed as a negative event. Unfortunately, the use of power-compensation DSC results in endothermic reactions being displayed as positive events, a situation which is counter to IUPAC recommendations [38]. When the heat-flux method is used to detect the thermal phenomena, the signs of the DSC events concur with those obtained using DTA, and also agree with the IUPAC recommendations. 

Surprisingly, when the cathode material, LiCo02, was in the presence of these thermally stable salts, Lilm and LiMe, much higher reactivity was detected than that in the presence of LiPFe, as indicated by the total absence of any combustion suppression on SHR that had been observed with LiPFe. DSC results of LiCoOz in the presence of Lilm- or LiBeti-based electrolytes confirmed the above observation, which showed the onset thermal decomposition of LiCo02 to be at 280 °C, whereas in LiPFe-based electrolytes the same thermal event was much suppressed in terms of heat evolution as the concentration of LiPFe increased. In other words, the presence of Lilm and LiBeti did not introduce any increase in the thermal stability of the electrode, while LiPFe, although believed to be thermally unstable, efficiently suppressed the thermal decomposition of the cathode. 

In Sect. 2, the structure of AU55 is discussed, utilizing the interatomic distances obtained from EXAFS [39,40,41]. DSC results [57] give further evidence that Au, is a stoichiometric molecular compound, and recent SIMS results [35, 36], confirm the molecular mass, the structure, and the stoichiometry of this compound, as originally postulated by Schmid [16]. 

A recent recalculation [43], utilizing the interatomic distance obtained from EXAFS [39,40] and the spring constant corrected for the higher binding energy extracted from the DSC results [57] reduced the ditference between the calculated and measured s to about 2%. 

Fig. 6. DSC results for epoxy resin cure with a carboxylic acid anhydride a) Set of displaced thermo-grams b) Curve deduced from a) and used to obtain isothermal cure data at temperature T. (From Ref.65), Fig. 3)...

Figures 3-5 that the dielectric relaxation again reveals only a single a relaxation for the mixtures. These are, however, noticeably broader than the a relaxation of the pure polymers. The temperatures of the loss maxima, when plotted (Figure 7) as a function of wu the weight fraction of PPO in the mixtures, do not display the smooth monotonic increase in T0 vs. Wi that was shown by both the Vibron and the DSC results. Instead, there is a pronounced increase in Tg above = 0.5 to give a sigmoid curve for this relation. Some reservations should be attached to this observation inasmuch as data for only three polyblend compositions are available nevertheless a qualitatively similar phenomenon is observed in the analysis of the intensity of the y peak (below). Further, if only the stronger maxima in the dynamical mechanical data are considered— i.e.y if the secondary peaks and shoulders which led to the identification of two phases are omitted—then a similar sigmoid curve is found. The significance of this observation is discussed later.

The DSC results support a segregated two-stage latex particle which is rich in p-styrene and in p-n-butyl acrylate. 

The heat capacities for the other compounds were derived using the estimation procedure described for the trichlorides, i.e., from the lattice and excess contributions. The former was derived from the enthalpy measurements, the latter from the crystal field energies. As the crystal energies of the tribromides and triiodides are poorly known, we have used the values for the trichlorides to approximate Cexs- The results thus obtained are listed in tables 10 and 11. The calculated data for TmG agree within 2% with the DSC results of Gardner and Preston (1991). 

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