Thermal performance analysis scanning calorimetry

Mathot VBF, Vanden Poel G, Pijpers TFJ. Benefits and potentials of high performance differential scanning calorimetry (HPer DSC). In Brown ME, Gallagher PK, editors. The Handbook of Thermal Analysis and Calorimetry. Volume 5 Further Advances, Techniques and Applications. OvSox. Elsevier 2008. p 269-298. 

Thermal Analysis - Differential Scanning Calorimetry (DSC) and thermal gravimetric analysis (TGA) were used to characterize the thermal properties of the polymers synthesized. DSC analysis was performed on a Perkin-Elmer Differential Scanning Calorimeter, Model 2C with a thermal analysis data station. Thermal gravimetric analysis (TGA) was carried out on a DuPont thermal gravimeter, Model 951. From the DSC and TGA plots of poly (N-pheny 1-3,4-dimethylene-... 

From the discussion presented of reactions in solids, it should be apparent that it is not practical in most cases to determine the concentration of some species during a kinetic study. In fact, it may be necessary to perform the analysis in a continuous way as the sample reacts with no separation necessary or even possible. Experimental methods that allow measurement of the progress of the reaction, especially as the temperature is increased, are particularly valuable. Two such techniques are thermo-gravimetric analysis (TGA) and differential scanning calorimetry (DSC). These techniques have become widely used to characterize solids, determine thermal stability, study phase changes, and so forth. Because they are so versatile in studies on solids, these techniques will be described briefly. 

If the observed AH is positive (endothermic reaction), the temperature of the sample will lag behind that of the reference. If the AH is negative (exothermic reaction), the temperature of the sample will exceed that of the reference. Owing to a variety of factors, DTA analysis is not normally used for quantitative work instead, it is used to deduce temperatures associated with thermal events. It can be a very useful adjunct to differential scanning calorimetry, since with most instrumentation DTA analysis can be performed in such a manner that corrosive... 

It was recognized quite some time ago that DTA analysis could be used to deduce the compatibility between a drug substance and its excipients in a formulation. The effect of lubricants on performance was as problematic then as it is now, and DTA proved to be a powerful method in the evaluation of possible incompatibilities. Jacobson and Reier used DTA to study the interaction between various penicillins and stearic acid [17]. For instance, the addition of 5% stearic acid to sodium oxacillin monohydrate completely obliterated the thermal events associated with the antibiotic. Since that time, many workers employed DTA analysis in the study of drug-excipient interactions, although the DTA method has been largely replaced by differential scanning calorimetry technology. 

Dynamic mechanical anlaysis (DMA) measurements were done on a Rheometrics RDS-7700 rheometer in torsional rectangular geometry mode using 60 x 12 x 3 mm samples at 0.05% strain and 1 Hz. Differential scanning calorimetry (DSC), thermomechanical analysis (TMA), and thermogravimetric analysis (TGA) were performed on a Perkin-Elmer 7000 thermal analysis system. 

A recent study on the stability of various indium alkyl derivatives has been performed using differential scanning calorimetry (DSC), which provides a comprehensive thermal fingerprint of the compounds. In addition, when this method of thermal analyses is used in conjunction with thermogravimetric analysis coupled to FTIR and/or GCMS evolved gas analysis, it can provide a complete mechanism for the decomposition pathway of prospective compounds. ... 

Comparison of several techniques (namely Fourier transform infrared spectroscopy (FTIR), simultaneous thermogravimetric analysis-differential scanning calorimetry (TGA-DSC) and ultrasonic spectroscopy) for assessing the residual physical and mechanical characteristics of polymer matrix composites (PMCs) exposed to excessive thermal loads showed the measured power spectra of ultrasonic energy to correlate with performance of graphite fibre epoxy matrix composites exposed to thermal degradation, and also that analyses with the three techniques all pointed to the same critical temperature at which thermally induced damage increased sharply [58],... 

The deactivated catalysts were also burned in a calorimeter under compressed air flowing at 40 ml/min. (Thermal Analysis Station TAS 100 - Rigaku - TG 8110). Analysis were performed by differential scanning calorimetry (TPO/DSC) and combustion heats were obtained by integration of the profiles and using appropriate calibration samples. 

Infrared spectra (IR) were taken on a Nicolet 7199 FT-IR. Thermal analyses were obtained on a DuPont 1090 thermal analyzer. Thermogravimetric analysis (TG) and differential scanning calorimetry (DSC) were performed at lO C/min. heating rates under N2. Reduced viscosity measurements (4) were made at 40-C in OC Ubbelohde viscometers. Values reported are the average of at least two measurements, which were within 0.2% of each other. Reduced viscosity is defined as follows ... 

Thermal Analysis involves differential scanning calorimetry (DSC) to identify various common engineering plastics. A thumbnail size sliver of the unknown material must be obtained from a location that will not impact the performance of the part, for example the outside edge of the gasket surface on a lined pipe or valve. The sample is sent to a laboratory that can perform DSC. See Figure 7-5. 

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