Differential thermal analysis measurement

C, differential thermal analysis, measured range -25.1 to 47.1°C, Kemme Kreps 1969)... 

Differential thermal analysis measurement at atmospheric pressure. 

C, ebulliometry-differential thermal analysis, measured range 22.6-117.8°C, Kemme Kreps... 

Differential thermal analysis measurement at atmospheric pressure. b Prepared by acylation of 12a with acetic anhydride in refluxing toluene (24h) and recrystallization from benzene. 

Study of the enantiomeric separation of 10a by complexation with 112 revealed two interesting modes of transformation of racemic complex 113 into conglomerate complex 114 in the solid state. One is a thermal transformation. Thermogravi-metric and differential thermal analysis measurements of 113 showed the evaporation of MeOH at 120°C, phase transfer from MeOH free-113 to 114 at 183 C and... 

Differential thermal analysis measurements indicated double TgS for solutions with lower polymer concentrations beyond the depicted cusp in Fig. 12.10 [59]. Creep recovery measurements on this system showed that the solvent molecules in the solutions have higher mobilities than the polymer chain segments. A lower temperature and greater crowding is therefore necessary to force the solvent molecules from an equilibrium response. Therefore, it was... 

DTA n. Differential thermal analysis measurement of melting temperature generates a plot of heat versus temperature and semiquantiative, but higher temperature range than DSC. DTA is capable of measuring events (e.g., melting, crystallization, and decomposition) but not heat of melting or crystallization whereas DSC is quantitative and appropriate for thermally... 

Differences in the pyrograms of block and random copolymers allow estimation of comonomer distribution. Random copolymers of ethylene with methyl acrylate or methyl methacrylate yield on pyrolysis a lower ratio of methanol/methyl acrylate or methanol/methyl methacrylate, respectively, than block polymers of the same composition. Differential thermal analysis measurements give a first-order transition for block polymers only, and by measuring the area under the transition, an indication of the minimum chain length between acrylate units can be obtained. 

PL Thermal Sciences produce the PL-STA MS. In this instrument a PL-STA 1500 analyser capable of making TGA and differential thermal analysis measurements is coupled with an MS, thereby augmenting weight loss and the differential temperature response data with quadrupole mass spectral data of the evolved gases such as oxygen, sulfur dioxide, and carbon dioxide. With a transfer time of evolved gases to the MS of about 100 ms, the MS-TGA is virtually simultaneous. 

Differential thermal analysis measures a complex thermal property function. In general it is not possible to deduce heat capacity from the experimental data. Nevertheless, differential thermal analysis has been, and probably continues to be, widely used, especially for detecting transitional phenomena. 

---