Differential scanning calorimetric scans

Figure 3 Comparison of a differential scanning calorimetric scan of fully hydrated DPPC multibilayer vesicles (continuous trace) and a dilatometric scan of the same vesicles (circles). The figure is taken from Reference 22.

FIGURE 12.15 Differential scanning calorimetric scans of polyacrylonitrile homopol5mer in nitrogen atmosphere. Exothermic peak arises from the cyclic degradation reaction. 

The worst hazard scenarios (excessive temperature and pressure rise accompanied by emission of toxic substances) must be worked out based upon calorimetric measurements (e.g. means to reduce hazards by using the inherent safety concept or Differential Scanning Calorimetry, DSC) and protection measures must be considered. If handling hazardous materials is considered too risky, procedures for generation of the hazardous reactants in situ in the reactor might be developed. Micro-reactor technology could also be an option. Completeness of the data on flammability, explosivity, (auto)ignition, static electricity, safe levels of exposure, environmental protection, transportation, etc. must be checked. Incompatibility of materials to be treated in a plant must be determined. 

Both thermogravimetric analysis and differential scanning calorimetric studies were carried out on modified and unmodified PPO samples. Table IV presents the weight losses and the glass transition temperatures of the most representative polymers. 

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.)... 

Fig. 13. Differential Scanning Calorimetric Analyses of Ethylene-Vinyl Acetate. ZB - Zinc Borate, ATH - Alumina Trihydrate.

Fig. 1.45. Schema of a differential scanning calorimetric (DSC) apparatus. Gerate DSC 821 . Temperature range with LN2 cooling -150 °C to 500 °C accuracy of temperature 0.2 °C resolution 0.7 gW in the measuring range of +/-350 mW cooling rate from +100 °C to -100 °C approx. 13 °C/min size of sample, several mg to 200 mg.

Williams, N. A. Differential scanning calorimetric studies on frozen cephalosporin l-solu-tions. Int. J. Pharm. 44 (1-3), p. 205-212, 1988... 

Using Differential Scanning Calorimetric and Roentgen-phase analyses methods it has been established that synthesized polymers are amorphous systems. Thermal (phase) transformation temperatures of synthesized polymers have been determined. Thermooxidation stability of the synthesized polymers has been studied. There was shown that their thermooxidation stability exceeded the analogical characteristic of polyorganocarbosiloxanes. 

J. H. Flynn. Thermodynamic Properties from Differential Scanning Calorimetry by Calorimetric Methods. Thermochim. Acta 1974, 8, 69-81. 

H. M. Heuvel, K. C. J. B. Lind. ComputerizedAnalysis and Correction of Differential Scanning Calorimetric Data for Effects Due to Thermal Lag and Heat Capacity Changes. Anal. Chem. 1970, 42, 1044—1048. 

Liggins, J.R., F. Sherman, A.J. Mathews, and B.T. Nall. 1994. Differential scanning calorimetric study of the thermal unfolding transitions of yeast iso-1 and iso-2 cytochromes c and three composite isozymes. Biochemistry 33 9209-9219. 

Maneri, L.R. and P.S. Low. 1988. Structural stability of the erythrocyte anion transporter, band 3, in different lipid environments. A differential scanning calorimetric study. J Biol Chem 263 16170-16178. 

Conejero-Lara, F., J.M. Sanchez-Ruiz, P.L. Mateo, F.J. Burgos, J. Vendrell, and F.X. Aviles. 1991. Differential scanning calorimetric study of carboxypeptidase B, procarboxypeptidase B and its globular activation domain. Eur J Biochem 200 663-670. 

Poeti, G., Fanelli, E., and Braghetti, M. A differential scanning calorimetric study of some phenol derivatives, J. Therm. Ana . Cahrim., 24(2) 273-279, 1982. 

Bheda et al. ( ) showed that cellulose triacetate forms a mesophase in dichloroacetic acid. Navard and Haudin (18) examined the thermal behavior of liquid crystalline solutions of CTA in TFA. Navard et al. (23) studied the isotropic to anisotropic transitions of solutions of cellulose triacetate in TFA using differential scanning calorimetry. Navard and Haudin (S2) studied the mesophases of cellulose and cellulose triacetate calorimetrically. Navard et al. (83) report similar studies. Meeten and Navard (97) showed the twist of the cholesteric helicoidal structure of CTA and secondary cellulose in TFA is left-handed. 

Figure 2. Differential scanning calorimetric analysis of a cobalt chloride modified BDSDA-ODA polyimide film.

Figure 3. Comparison of differential scanning calorimetric data (parts A and B) with thermomechanical analysis data (part C) for a cobalt chloride modified BTDA-ODA polyimide film.

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