Temperature-modulated scanning

ASTM E1952, 2001. Standard test method for thermal conductivity and thermal diffusivity by modulated temperature differential scanning calorimetry. 

Figure 18.12. Example heat flow behavior of temperature-modulated differential scanning calorimetry. Reproduced from Young and LeBoeuf (2000), by permission of the American Chemical Society.

Figure 18.17. Temperature-modulated differential scanning calorimetry scan of poly(methyl methacrylate) indicating P-relaxation near 32°C and a relaxation (Tg) near 121 °C. Reproduced from DeLapp et al. (2004), by permission of Elsevier, Ltd.

TABLE 18.4. Select NOM Characterization Studies by Differential Scanning Calorimetry (DSC) and Temperature-Modulated Differential Scanning Calorimetry (TMDSC)... 

Hutchinson, J. M. (1998). Characterising the glass transition and relaxation kinetics by conventional and temperature-modulated differential scanning calorimetry. Thermochimica Acta 324(1-2), 165-174. 

Schawe, J. E. K. (1998). A description of the glass transition measured by temperature modulated differential scanning calorimetry. Colloid Polym. Sci. 276(7), 565-569. 

Bottom, R. (1999). The role of modulated temperature differential scanning calorimetry in the characterisation of a drug molecule exhibiting polymorphic and glass forming tendencies. Int. J. Pharm., 192,47-53. [251]... 

Dielectric relaxation, temperature-modulated differential scanning calorimetry (TMDSC), and H NMR spectroscopy (see Section 4.05.3.2.1) have been used to perform the dynamic characterization of fananserine 35. The use of these three different techniques gives a coherent set of information and allowed the authors to describe the dynamic properties over a wide range of frequencies and temperatures <2006MI798>. 

MODULATED TEMPERATURE DIFFERENTIAL SCANNING CALORIMETRY/DYNAMIC DIFFERENTIAL SCANNING CALORIMETRY... 

Reading M. Hourston DJ. Modulated Temperature Differential Scanning Calorimetry. Theory and Practical Applications in Polymer Characterisation. Dordrecht, Holland Springer, 2006. 

Coleman NJ, Craig DQM. Modulated temperature differential scanning calorimetry A novel approach to pharmaceutical thermal analysis. Ini J Pharm 1996 135 13-29. 

Differential Scanning Calorimetry. DSC scans were made at 20°C min"1 on a Mettler TA300O system equipped with a DSC-30 low temperature module. Temperature calibration was done with a multiple Indium-lead-nickel standard. An indium standard was used for heat flow calibration. Thin shavings (ca. 0.5 mm thick) were cut with a razor blade from the cross-sectional edge of a plaque. These sections contained both surface and center portions. 

Wunderlich, B. Jin, Y. Boiler, A. Mathematical description of differential scanning calorimetry based on periodic temperature modulation. Ther-mochim. Acta 1994, 238, 277-293. 

He R, Craig DQM. An investigation into the thermal behaviour of an amorphous drug using low frequency dielectric spectroscopy and modulated temperature differential scanning calorimetry. J Pharm Pharmacol 2001 53 41-48. 

Temperature modulated DSC (MDSC)2°2-204 jg another technique that has proved useful in the study of the glass transition " - where, it has been claimed, the approach is capable of providing better resolution and sensitivity than conventional DSC.2° In this, a modulated temperature programme is superimposed upon the conventional heating ramp and the resulting heat flows are interpreted in terms of two heat capacities an in-phase storage heat capacity and an out-of-phase kinetic heat capacity. Various theoretical procedures have been proposed for this and there is little doubt that the approach can provide information that is complementary to conventional DSC.2 ° However, the technique does involve slow temperature scans (cf. high-speed DSC above) and the authors feel that there are areas where the additional data are not, at present, easy to interpret. 

Temperature-modulated differential scanning calorimetry Internal energy of segmental interactions Upper critical solution temperature N - Vinylcaprolactam... 

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