Calorimetry, differential curve

Figure 15. Differential Scanning Calorimetry (DSC) curve of 90% trans-i, 4-poly butadiene...

FIGURE 3.1 Differential scanning calorimetry melting curves (scan rate 0.04°C/min) of trimyristin dispersions (10% triglyceride stabilized with different concentrations of tyloxapol) with different mean photon correlation spectroscopy z-average diameters. The raw material was dispersed in an aqueous phase containing 1% tyloxapol. (Adapted from [1]. Copyright 2000, American Chemical Society. With permission.)... 

Recently Kishorc and laye 1116] examined thermal decomposition of cyclonite by differential scanning calorimetry. The curves of the decomposition arc of an S shape (similar to those of tetryl — Rg. 53). Isothermal curves are similar to Figs 55 and 56. Tlie author calculated the value of decomposition of cyclonite in an open vessel as being 41 2 kcal/mol. They also reported the values of obtained by other authors. In addition to those given in Vol. HI, p. 83 (by Robertson), they are those of ... 

Mechanistic information on the PVC thermal degradation can also be derived from the differential scanning calorimetry (DSC) curve shown in Figure 4.12. Two large endothermic peaks are observed at 286 and 446 °C. The first indicates that the dehydrochlorination step, involving the cleavage of the C-Cl bond, is an endothermic reaction. The appearance of a small exothermic peak at 358 °C has been attributed to the cyclization and crosslinking of the polyene structure. 

Differential scanning calorimetry (DSC) curves of levofloxacin hemihydrate measured under various conditions showed different thermograms. This behavior was attributed to the dehydration process that resulted in a multiple-phase transition. Dehydration at higher temperatures (above 70° C) gave a sharp endothermic peak in the DSC thermogram due to the melting of the y-form, and at a lower temperature (50°C) it led to the observation of a sharp endothermic peak due to the... 

Fitting Differential Scanning Calorimetry Heating Curves for Polyetherimide Using a Model of Structural... 

Differential scanning calorimetry (DSC) curves of the binary blends (a) PS/PBMA, (b) A5-PS/... 

The second representation of the transition temperature, Tb, utilizes the onset of the transition as estimated from the differential scanning calorimetry (DSC) curve in Figure 5.1C, as estimated by the intersection of the initial baseline and the initial rise of the curve. 

Fig. 8 Differential scanning calorimetry heating curves of PBS crystallized at different temperatures, a PBS with about 2.5 x 10 (Yasuniwa et al. 2005), b PBS with about 6,800 (Papageorgiou and Bikiaiis 2005)...

Fig. 2. shows thermogravimetric (TG) and differential scanning calorimetry (DSC) curves for coumarin, 3-cyclodextrin, their mixture, and the precipitate. Coumarin melts at 70 C and easily evaporates at... 

Figure 4.3 shows a sample temperature-heat flow differential scanning calorimetry (DSC) curve obtained for high-density polyethylene using a PerkinEImer DSC-7 instrument. It illustrates the measurement of the T and heat of melting in a single run. 

Fay et al. evaluated the effects of morphology, crosslink density and miscibility on IPN damping properties for a number of acrylic, methacrylic, styrene and butadiene-based copolymers and IPNs. The differential scanning calorimetry (DSC) curve of 50/50 composition showed a narrow Tg for... 

Cheng, W.T. Lin, S.Y. Wang, S.L. (2008). Differential Scanning Calorimetry with Curve-Fitting Program Used to Quantitatively Analyze the Polymorphic Transformation of Famotidine in the Compressed Compact. Drug Development and Industrial Pharmacy, Vol 34, No. 12, (December 2008), pp. 1368-1375, ISSN 0363-9045... 

Figure 2.5. Differential scanning calorimetry (DSC) curves of two polymorphs of picryltoluidine. Crystals of form Ir were obtained from methanol, whereas form was obtained from an acetone-water solution. Whereas form Ir exhibits an endothermic melting peak at 166°C, form IIo melts at 163°C. Further, the enthalpies of fusion for Ir and IIq forms are determined as 31.3 and 28.6 kJ/mol, respectively. Reproduced with permission from Cryst. Growth Des. 2008,8,1977. Copyright 2008 American Chemical Society.

Modulated differential scanning calorimetry (MDSC) curves were obtained using a Universal V2.4F TA spectrometer. First scan MDSC heating curves were obtained by heating at 5 C min to the desired temperature. Second scan MDSC heating curves were obtained by first cooling the sample after the first heating in the instrument over ca. 17 min. The sample was then heated at 5 °C min to the desired temperature. 

Copolymer [8o,5-CPPo.5]-Leu(6)o 75-Lys(Bz)o.25 (Table 1) with Mw = 82 000 Da and polydispersity (PDI) = 1.66 was isolated with 76 % yield. As a result, the incorporation of 50% CPP-unit in sebacic acid based PEA raised the Tg from 22 to 44°C. An additional sharp melting endotherm in differential scanning calorimetry (DSC) curves at 286°C was also observed, indicating a semicrystalline nature of the co-polymer. The polymer is soluble in chlorinated nonpolar and aprotic polar solvents, but not in ethanol. Because of its high hydrophobicity, the CPP-co-polymer does not swell in aqueous media, and equilibrium water content is about 2-3% w/w. 

---