Calorimetry, differential scanning thermogram

Fig. 5. Differential scanning calorimetry thermogram. Amorphous PPS is heated from room temperature to 325°C at 20°C/min.

Fig. 10. Differential scanning calorimetry thermogram of a thermoset. The reaction order is 1.83, = 95 kJ/mol (22.7 kcal/mol), and the heat of...

Fig. 2. Differential scanning calorimetry thermogram of miconazole nitrate.

Fig. 6 Differential scanning calorimetry thermogram of 2,4-dinitrophenyl-2,4-dinitro-benzoate, illustrating the recrystallization of form IV into form III (Tl), the melting of forms III and II (T2 and T4), the solidification of the melts produced by T2 and T4 (T3 and T5), and the melting of form I (T6). (Data adapted from Ref. 46.)...

Fig. 10 Differential scanning calorimetry thermograms obtained for diflunisal, form I (lower trace) and form II (upper trace).

Fig. 12 Differential scanning calorimetry thermograms obtained for piretanide, as recrystallized from (a) f-butanol, (b) n-propanol, (c) i-propanol, and (d) IV V-dimethyl-formamide. (Data adapted from Ref. 34.)...

Use of thermogravimetry to facilitate interpretation of differential scanning calorimetry thermograms... 

The differential scanning calorimetry thermogram of diloxanide furoate is shown in Figure 2. The data were obtained using a DuPont TA-9900 thermal analyzer system interfaced with the DuPont data unit. The thermogram was recorded using a heating rate of 10°C/minute, over a temperature interval of 100-250°C. 

The melting temperature (Tm) of the biopolymer was determined from differential scanning calorimetry thermograms. The Tm value of the P (3HB) homopolymer was about 177°C and P (3HB) with 10% P(3HV) was about 150°C (Table l),but the Tm values of biopolymer extracted from E. coli HMS174 were about 166°C. The Tm of the sample was lower than that of the P (3HB) homopolymer, but higher than that of the P (3HB) with 10% P (3HV), because the P (3HV) content in the sample is only about 4.5% of the biopolymer produced. The PHV content in extracted biopolymer was low, the flexibility of extracted biopolymer was low, and different fermentation conditions should be investigated. 

Differential scanning calorimetry thermogram pattern of spironolactone. 

Stratum corneum lipids and lanolin share an important physical characteristic in that they can coexist as solids and liquids at physiological temperatures.33 A differential scanning calorimetry thermogram of lanolin is similar to that of stratum corneum lipids, showing two broad (heterogenous) phase transitions with midpoint melting temperatures at 21.9 and 38.3°C.16 The lower temperature peak may represent the transition from a liquid crystal to a gel phase, which has also been described for lanolin alcohols.34... 

Differential scanning calorimetry thermograms of hydroxyalkylated cydodextrins are consistent with the noncrystalline nature of the derivatives, showing no sharp melting peak that would be found for a crystalline substance. Instead, a change of... 

There has been some interest in thermal analysis methods for permanence evaluation. An attempt was made to correlate various features of differential scanning calorimetry thermograms for a group of papers with their stability under oven aging. In some cases, the correlation coefficient was encouragingly high but the standard error of estimate showed that the relation was no more useful for predicting permanence than was pH. 

The differential scanning calorimetry thermogram of lomefloxacin hydrochloride obtained on a Shimadzu DSC-50 instrument at a scan rate of 5°C/min is given in Figure 19. The thermogram exhibits a sharp melt peak with an onset temperature of 294°C and an extrapolated melting point of about 304°C followed by decomposition. 

---