DSC melting thermogram

Figure 2. DSC melting thermograms for (a) linear, (b) 9.65, (c) 14.1, (d) 20.6, (e) 28.6 branches/1OOOC PE aystallized at different temperatures for 30 min. The melting scans were initiated at the crystallization temperatures with a rate of 2.5°C/min.

Fig. 26 DSC melting thermograms of irradiated PVDF films from 0 to 1200 kGy (Reprinted with permission of Elsevier) [51]...

Figure 10.13 DSC melting thermograms of ethylene-propylene copolymer (EPS 3.0 mol-% ethylene), propylene-(l-bu-tene) copolymer (BPS 7.6 mol-% 1-butene), and BPS/EPS 50/50 blend after isothermal crystallization in the range of 60-110°C (heating rate 10°C/min). Reprinted from Bartczak et al. [66], Copyright 2006, with permission from Elsevier.

The DSC thermograms of several triblock copolymers and homopolymer HB are coiq>ared to that of a low density polyethylene in Figure 2. The thermograms are those of the first run on quenched samples. Their behavior is similar except that the temperature of the maximum in the DSC melting peak, Tm, for LDPE (110 C) is higher than that of HB (102°C). The depression of the melting point brought about by the presence of 5 to 8 mole percent... 

Similarly, differences in manufacturing substantially affect the DSC melting profile (7). In figure 8 we see thermal curves of nearly identical polyester yarns. Sample one and two are identical in composition--both contain a dyability additive--but were annealed at different temperatures as can readily be seen by the position of the annealing "scars" on the thermograms. The effect of the dyability additive apparently is that it lowers and broadens the melting peak destroying its characteristic first-run, double-peak behavior. 

Figure 3.1 DSC melting and crystallisation thermograms of palm oil. For melting thermogram, sample was cooled to — 30°C at rate of 40°C/min, held for 10 mins and heated to 80°C at 5°C/min for cooling thermogram, sample was melted to 80°C and cooled to —30°C at 5°C/min. Lm low melting fraction, Hm high melting fraction.

Differential Scanning Calorimetry (DSC) of the PPTA/ sulfuric acid system was carried out in order to establish the melting behavior of the system. Samples (5-10 mg) were sealed in gold-coated aluminum pans under N, and cooled at 10 C/min to -150 C. Subsequently the samples were heated to 100 C at 10 C/min and the melting thermograms were recorded. 

Figure 3 DSC warming thermograms for tert-butanol/water mixtures (a) 15% w/w tert-butanol (b) 20% w/w tert-butanol (c) 50% w/w tert-butanol (Endotherm A melting of metastable eutectic Exotherm B recrystaUization of metastable eutectic form to stable form Endotherm C melting of eutectic Exotherm D melting of tert-butanol hydrate) (d) thermal treatment of 50% w/w solution at —TC to eliminate metastable states [28]. 

Both pure PEN and the PEN/CNT nanocomposites exhibited multiple melting peaks in the DSC heating thermograms. The small and low melting peaks observed at approximately 10-15 °C above the isothermal crystallization temperature was attributed to the melting of... 

An X-ray diffraction study of PHA-10UND= showed that this PHA was amorphous however, the DSC thermogram of the polymer showed a small but clear endotherm at approximately 38 °C. The glass transition temperature of PHA-10UND= is approximately - 46 °C which is significantly lower than those of the poly(nHAMCL)s. Both the melting temperature and the glass transition tempe-... 

The differential scanning calorimetry (DSC) thermogram of miconazole was obtained using a DuPont 2100 thermal analyzer system. The thermogram shown in Fig. 2 was obtained at a heating rate of 10°C/min and was run over the range 50—300 °C. Miconazole was found to melt at 186.55 °C. 

The differential scanning calorimetry (DSC) thermogram of niclosamide was obtained using a General V4 IC DuPont 2100. The data points represented by the curve shown in Fig. 2 were collected from 200 to 400°C using a heating rate of 5°C/ min. It was found that the compound melted at 231.66°C with an enthalpy of fusion equal to 69.31 J/g. 

Figure 8 shows the DSC thermogram of griseofulvin obtained with a DuPont Model 900 Thermal Analyzer. A single sharp melting endotherm occurs for this substance with onset temperature at 216 C. 

Figure 2.2. DSC thermograms of n = 6 monomer illustrating melting point processing window at three stages of purification (top, crude monomer product middle, insufficiently purified monomer bottom, sufficiently purified monomer).

Fig. 4.12. DSC thermogram of non-solvated ibuprofen lysinate, illustrating the enantiotropic conversion of the metastable phase to the more stable phase (64°C endotherm) and subsequent melting of the stable form (181°C endotherm).

In another experiment, the newly melted material from the second rescan (bottom trace, Fig. 4.14) was slowly allowed to cool from 120 to 20°C over a two-day time period. As shown in Fig. 4.16, the DSC thermogram of this sample showed the same three-part pattern, but the ratio of lower melting metastable form to the higher melting stable form was greatly shifted in favor of the thermodynamically stable form. 

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