Differential scanning calorimetric curve

Figure 8-9 Differential scanning calorimetric curves for l-stearoyl-2-linoleoyl-sw-glycerol. (A) Crystals of the compound grown from a hexane solution were heated from -10° to 35°C at a rate of 5°C per minute and the heat absorbed by the sample was recorded. (B) The molten lipid was cooled from 35° to -10°C at a rate of 5° per minute and the heat evolved was recorded as the lipid crystallized in the a phase and was then transformed through two sub-a phases. (C) The solid was reheated. From Di and Small.87 Courtesy of Donald M. Small.

Difference electron density map 136 Differential scanning calorimetric curves 395 Differentiation... 

In copolymers of group B the Curie transition appears in the differential scanning calorimetric curve as a broad peak, extending over a temperature interval which narrows down with increasing VF2 content. The transition... 

FIGURE 7 Differential scanning calorimetric curve for vitamin D3. 

The high melt viscosity of Larc-TPI at 350°C (10 Pas) prohibits its use as an adhesive for bonding metallic or laminate skins on core honeycombs to make high strength sandwich structures. The work of Chow et al. discussed in Section 4.3.2.2 demonstrates that the melt viscosity of the poly(isoimide) form 21 of Fare TPI is of the order of 10 Pas at 240-250°C, compared to 2 x 10 Pas for polyimide 22 [25]. A semi-crystalline form of Larc-TPI has been obtained by chemical imidisation of the polyamic acid with acetic anhydride and triethylamine [63]. The differential scanning calorimetric curve exhibits an endotherm at 274°C due to melting of the crystalline sites. The value of the initial inherent viscosity (0.22 dl g ) indicates, however, that the lower melt viscosity also results from lower molecular weight polymer. 

The differential scanning calorimetric curve of highly crystalline polypropylene at various gamma radiation doses between 0 and 120 kGy indicates an increase in thermal stability of the polymer with increasing radiation dose. 

Figure 1. Differential Scanning Calorimetric Curves of Bis Phenol and Polyesters (APE) as a Function of composition.

Fig. 22. Differential scanning calorimetric curves of amorphous Al, o jTb and Al o jDyj (x = 9, 10, 11 and 12at%) alloys.

Figure 9 Differential scanning calorimetric curves of AMF, MF-TAGs, and MF-DAGs in (a) the crystallization mode and (b) the melting mode at 5.0°C/min.

Figure 9 Differential scanning calorimetric (DSC) curve showing the phase transitions observed on heating the amorphous form (glass) of polyethylene terephthalate. (Reproduced with permission from Ref. 38.)...

Figure 10 Oscillating differential scanning calorimetric (ODSC) curves showing the separation of the glass transition (reversible, i.e., thermodynamic component) and enthal-pic relaxation (irreversible, i.e., kinetic component) which overlap in the full DSC scan. (Reprinted with permission from Ref. 38.)... 

The differential scanning calorimetric (DSC) Curve of tolnaftate is shown in Figure 6. The sample was heated in a nonhermetically crimped aluminum pan at a rate of 10°C/min on a differential scanning calorimeter (model 910, Du Pont). A single endothermic peak corresponding to the melting of the compound was observed at 113°C. The enthalpy of fusion was found to be 62.7 J/g (6). 

Figure 6. Differential Scanning Calorimetric (DSC) Curve of Tolnaftate.

Figure 16.2 shows a sample temperature-heat flow differential scanning calorimetric (DSC) curve obtained for high-density polyethylene (HDPE) using a Perkin Elmer DSC-7 instrument illustrating the measurement of the and the heat of melting in a single run. 

Calorimetric measurements at a salt concentration of 0.8 M (NaCl) were carried out with a differential scanning microcalorimeter microDSC III (Setaram, Caluire, France). The melting of naphthalene was used to calibrate the apparatus. The sample cell was filled with 850 mg carrageenan solution (0.2% w/w in 0.8M NaCl) and the reference cell with exactly the same amount of NaCl solution. Heating and cooling curves were recorded in the temperature range from 10 to 120°C at a rate of 1.0°C min-1. 

Calorimetric methods in which temperature-heat-content curves are obtained. An adiabatic calorimeter or a differential scanning calorimeter may be employed The latter instrument is much more convenient to use and is capable of almost the same accuracy and precision as the former technique. 

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