Differential scanning calorimeter trace

Figure 3. Differential scanning calorimeter traces of 1 1 DMP-DPP copolymers...

Fig. 36 Differential Scanning Calorimeter traces of (a) PSIO-y-CD star, (b) PS, (c) PSIO-y-CD star + PS, (d) PDMS + PS, and (e) PSIO-y-CD star + PDMS + PS. The star containing sample incorporated 1 wt% y-CD, whereas samples containing PDMS (MW = 308kg mol-1) incorporated 5 wt%, while with the remainder of the mass was composed of PS (MW = 280kg mol-1). All DSC curves present the second heating cycle for each sample at a heating rate of 10°Cmin-1 under helium purge gas...

Figure 6. Differential scanning calorimeter traces of a 33% 4GT/PTMEG(2000)-T copolymer and of a polymer blend having the same composition solid line represents copolymer dashed line represents blend.

Figure 3. Differential scanning calorimeter traces of 73-series Halthanes show the soft and hard segment glass transitions and a melting endotherm. The temperatures of these transitions are consistent with the dynamic mechanical measurements.

Figure 7. Differential scanning calorimeter traces of 87- and 88-series Halthanes show the soft segment glass transition and a curing endotherm at about —70° and 100°C, respectively.

Fig. 2.3. Differential scanning calorimeter trace of dipalmitoyl phosphatidylcholine bilayers dispersed in water. The reference pan contained distilled water.

Figure 7.8 A differential scanning calorimeter investigation of the triglyceride lipase cutinase from Fusarium solani pish at pH 8.5. The buffer 20 mM glycine (flat trace) and the protein solution in the glycine buffer have been studied separately. A distinct signal at about 55 degree C defines the thermal denaturation of the enzyme. These scans were...

Although the output traces of a differential scanning calorimeter (DSC) are visually similar to a DTA, the operating principle of this device is entirely different. Figure 3.3 shows... 

A disadvantage of amorphous alloys is their metastable character which makes them transform into the stable crystalline state as a function of temperature and time. In calorimetric experiments the amorphous-to-crystalline transition is revealed by an exothermic heat effect. Typical traces obtained using a differential scanning calorimeter are shown for amorphous Gd064Co0 36 in fig. 51. The dependence of the crystallization temperature Tx on the heating rate s implies that there is a risk of crystallization taking place even at room temperature after an extended period (s - 0). This is particularly likely when Tx is rather low, and it may have consequences for practical applications. 

Fig. 51. Traces of measurements on Gd0 64Co0 36 made using a differential scanning calorimeter operated at two different heating rates. The positions of the glass transition temperature Tg and the crystallization temperature 7X are indicated for the higher heating rate. The inset shows the level scheme for the amorphous-to-crystalhne transformation. The experimental values for the activation enthalpy AE = Eac — Ea is 3. 29 eV or 317 kJ mol 1. The value for the crystallization enthalpy A Hc, = Ec — EA is 3.8...

Specific heat vs. temperature trace for heating a polypropylene copolymer at 20° min in a differential scanning calorimeter. The separate melting peaks indicate a polyethylene component, and a range of crystalline perfection. 

The nature of the first-order transitions is best illustrated by observing the behavior of these materials in a differential scanning calorimeter (DSC). Rgure 7.5 shows the heating trace of a side-chain liquid crystalline acrylate with the structure... 

Differential Scanning Calorimeter n (DSC) An instrument that measures the rate of heat evolution of absorption of a specimen while it is undergoing a programmed temperature rise (Gooch, 1997). A recorder displays the data as a trace of increase in heat per increase in temperature (d /dT) versus temperature. An example of a DSC thermogram of polypropylene is shown. The DSC has been used to study curing reactions and related properties of thermosetting resins, and heats of decomposition of resins. (An example of a DSC instrument is the PerkinElmer Diamond DSC. 

Figure 24 Differential scanning calorimeter (DSC) traces for OBCs made using two catalysts and a chain shuttling agent. The polymers have nominally the same soft segment composition but varying hard segment compositions.

Fig. 22. Scanning differential calorimeter trace of heating (top) and cooling (bottom) of a melt crystallized trans-1,4-polybutadiene (Drawn after Ref.14S), Perkin-Elmer DSC, unspecified heating and cooling rates)...

---