Differential scanning calorimetric

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. 

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. 

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.

Chrzanowski FA, Ulissi LA, Fegely BJ, Newman AC. Preformulation excipient compatibility testing application of a differential scanning calorimetric method versus a wet granulation simulating, isothermal stress method. Drug Devel Ind Pharm 1986 12(6) 783-800. 

Yamasaki M, Yano H, Aoki K. Differential scanning calorimetric studies on bovine serum albumin II. Effects of neutral salts and urea. Int J Biol Macromol 1991 13(6) 322—328. 

Measurements of glass transition temperatures at high pressure were made indirectly using, in particular, creep compliance [95, 96] or directly using differential scanning calorimetric techniques [97, 98]. The measured depression reaches values as high as 60°C for poly(methyl methacrylate) and polystyrene. 

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... 

The first directly-measured evidence that C—H bond rupture in the methyl group is the rate-determining step in the thermal de compn of TNT has been obtained with isothermal differential scanning calorimetric (DSC) analysis using deuterium isotope effects (Ref 96), DSC analysis has also been used to determine the kinetic parameters of thermal decompn (Ref 92). Others (Ref 101) have also studied the mechanism of the reaction using the deuterium isotope effect. Data are available on heat generation in... 

Differential scanning calorimetric methods are applied for the determination of heat of fusion, purity, specific heat and activation energy of decompn for undiluted, unmixed samples of TNT, TNB, Tetryl, RDX, HMX and PETN (Ref 28). The differential thermal analysis thermo-... 

The dielectric relaxation of bulk mixtures of poly(2jS-di-methylphenylene oxide) and atactic polystyrene has been measured as a function of sample composition, frequency, and temperature. The results are compared with earlier dynamic mechanical and (differential scanning) calorimetric studies of the same samples. It is concluded that the polymers are miscible but probably not at a segmental level. A detailed analysis suggests that the particular samples investigated may be considered in terms of a continuous phase-dispersed phase concept, in which the former is a PS-rich and the latter a PPO-rich material, except for the sample containing 75% PPO-25% PS in which the converse is postulated. 

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