Thermal differential scanning calorimetr

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. 

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-... 

Differential scanning calorimetric and infrared spectroscopic investigations of intact stratum corneum, extracted lipids and keratinized protein residue sheets suggested the thermal transitions occurring within the 30 to 70°C region were associated with increased molecular mobility of the lipids. The permeability coefficients of lipophilic molecules through hairless mouse skin increased by several orders of magnitude over the same temperature... 

Abstract. Gas interstitial fullerenes was produced by precipitation of C6o from the solution in 1,2 dichlorobenzene saturated by O2, N2, or Ar. The structure and chemical composition of the fullerenes was characterized by X-ray powder diffraction analysis, FTIR spectroscopy, thermal desorption mass spectrometry, differential scanning calorimetric and chemical analysis. The images of fullerene microcrystals were analyzed by SEM equipped with energy dispersive X-ray spectroscopy (EDS) attachment. Thermal desorption mass spectroscopy and EDS analysis confirmed the presence of Ar, N and O in C60 specimens. From the diffraction data it has been shown that fullerite with face centered cubic lattice was formed as a result of precipitation. The lattice parameter a was found to enhance for precipitated fullerene microcrystals (a = 14.19 -14.25 A) in comparison with that for pure C60 (a = 14.15 A) due to the occupation of octahedral interstices by nitrogen, oxygen or argon molecules. The phase transition temperature and enthalpy of transition for the precipitated fullerene microcrystals decreased in comparison with pure Cgo- Low temperature wet procedure described in the paper opens a new possibility to incorporate chemically active molecules like oxygen to the fullerene microcrystals. 

The thermal decomposition of adducts of A-phenylmaleimide and A-phenylcitraconimide with benzyl azides to yield aziridines via the loss of N2 has been studied by thermogravimetric and differential scanning calorimetric methods. It was found that the decomposition of the triazolines (60a-d) depends upon the nature of the para-substituent on the benzyl moiety. Also, the methyl... 

During investigation of a new material it is unlikely that any single thermal analysis technique will provide all the information required to understand its behavior. Complementary information is usually needed, which may be from another simultaneous thermal technique such as thermogravimetric-differential scanning calorimetric-mass spectrometry (TG-DSC-MS), gas chromatography (TG-GC, or DSG-GG), or spectroscopic methods such as IR spectroscopy or X-ray photoelectron spectroscopy (XPS). 

Differential scanning calorimetric runs were conducted on a Du Pont Thermal Analyzer (Model 9900) at an arbitrary heating rate of 10°C/min. Indium standard was used for temperature calibration. 

Howell, B.K., Matthews, A.D., and Donnelly, A.P., Thermal stability of fish myofibrils a differential scanning calorimetric study, Int. J. Food Sci. Technol., 26, 283, 1991. 

There are several reports in the literature describing the effect of chemical structure on the observed thermal properties of lignin. " In the thermal processing of lignin for structural applications, the relationship between chemical structure and thermal properties is of extreme importance. Differential scanning calorimetric (DSC) analysis of HKL and SKL is shown in Fig. 3. The glass transition temperature (Tg) of the HKL appears at 93 "C, much lower than that of the SKL, ID C. 

R)- and S- CHT A [Tf2N]" are liquid at room temperature, and results from differential scanning calorimetric (DSC) measurements indicate that they have glass transition temperature of -58.4°C. Results from thermal... 

Differential scanning calorimetric (DSC) evidence suggests the possibility of using this thermal method to identify a rigid, amorphous fraction formed by the immobilization of a surface layer of binder in contact with aggregate. 

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