Differential scanning calorimetry curves for

Fig. 7. Thermogravimetry and differential scanning calorimetry curves for corn cob xylan (Unpublished data).

Figure 6. Differential scanning calorimetry curves for silicone-epoxy compounds. Key ...

Figure 11. Differential scanning calorimetry curves for semiconductor-grade novolac epoxy compounds. Key ---, Sample F(FR) ----, Sample G (no FR) ambient-nitrogen temperature...

Figure 1. Differential scanning calorimetry curves for 50 wt% dispersions of 1,2-dipalmitoylphosphatidy1-choline-cholesterol mixtures in water containing (a) 0 (b) 5.0 (c) 12.5 (d) 20.0 (e) 32.0 and (f) 50.0 mol% cholesterol. (Reproduced with permission from Ref. 11. Copyright 1968 Elsevier Science Publishing Company, Inc.)...

Figure 6. Effect of annealing on the differential scanning calorimetry curves for a poly(tetramethyl-ene oxide) polyurethane (MDI/BD) (ET-38-1) containing 38% by wt MDI, Thermal treatment (a) control (b) 80°C, 4 hr (c) 110°C, 4 hr and (d) 150°C, 4.5 hr.

Figure 7. Differential scanning calorimetry curves for anhydrous milkfat cooled at rates of 0.1° C/ min, TC/min, and 5° C/min to 5° C and stored for time periods (A) 10 minutes, (B) 1 day, (C) 7 days, and (D) 14 days.

Based on the structure-related addition schemes for the thermal properties, it should, for example, be possible to quantitatively generate differential scanning calorimetry curves for polymers, copolymers and their mixtures. With easy access to the data bank, it should be possible for thermal analysts to compare their newly measured DSC curves with the computer generated standard curves for on-line analysis of macromolecules. 

FIGURE 7.16 Differential scanning calorimetry curve for a laser-irradiated crystal of Na2[Fe(CN)5N0]-2H20. Heating rate, 4°C/min. Ref. 13f... 

Figure 2. Differential scanning calorimetry curves (10°C/min) for blends of polystyrene, PS-600 with PMMA (upper) 34 wt% PS-600 (lower) 42 wt% PS-600.

Figure 3. Differential scanning calorimetry curves (10°C/ min) for blend of 25 wt% PS-2100 in PMMA (upper) after one year at room temperature (lower) after quenching from approximately 150°C.

A similar thermally-induced inversion of the cholesteric sense was observed for the PBLG liquid crystal in benzyl alcohol. In this solution, a gel-like opaque phase coexists with the cholesteric phase at lower temperatures. The opaque phase disappears around 70 °C, where endothermic peaks are observed in the differential scanning calorimetry curve. The value of S below 70 °C remains constant, and then changes with temperature above 70 °C. The compensation occurs at about 103 °C, and the transition from biphasic phase to the isotropic phase is observed above 150 °C in this case. The results are summarized in Fig. 12, where the reciprocal of the half-pitch is plotted against temperature. The sign of 1/S is taken as positive when the cholesteric sense is the right-handed. 

List some of the factors that influence (a) thermogravimetry curves, (b) differential thermal analysis curves, and (c) differential scanning calorimetry curves, indicating which are most important for the various techniques. 

FIGURE 7.33 Differential scanning calorimetry curve (a, c) and their derivatives (b, d) for soil samples of (a, b) AC horizon of Houston city and (c, d) Houston black clay the reference was an empty pan, the heating rate was 2.0°C/min, and the atmosphere was pure N2. (Reprinted from Tan et al., Methods of Soil Analysis. Part 1. Physical and Mineralogical Methods, American Society of Agronomy-Soil Science Society of America, Madison, Wisconsin, 2010. With permission from the Soil Science Society of America.)... 

Figure 8 Spiels the results (rf differential scanning calorimetry (DSQ for the three samples (12]. For the balanced sample, an exothermic peak U observed over 100 C for the first run of heating curve. The peak appears neither in the second run for the balanced sample nor in the first and second runs for the unbalanced samples. This exothermic peak for the balanced sample should represent the heat of polymerizalkm of oUgomers.

Levine and Slade [1.16] investigated the mechanics of cryostability by carbohydrates. Figure 1.19.1 shows an idealized phase diagram developed from differential scanning calorimetry (DSC) measurements for hydrolyzed starch (MW > 100) and for polyhydroxy combinations having a small molecular mass. With slow cooling (quasi in equilibrium conditions), no water crystallizes below the Tg curve. 

The liquid fraction sensitivity is an important parameter for the determination of the semi-solid forming capability. It is defined as the rate of change of the liquid fraction in the alloy with temperature and is related to the relative slopes, in the phase diagram, of the liquidus and solidus curves. It may be determined by differential scanning calorimetry or predicted by thermodynamic modelling. Examples related to various Al alloys have been reported by Maciel Camacho et al. (2003), Dong (2003). See also several papers in Chiarmetta and Rosso (2000). 

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