Modulated Calorimetry Fire Science and Degradation Food Science General Poster Session General Session Honorary Session for Bruce Prime Hyphenated Thermal Analysis Isothermal Calorimetry/Microcalorimetry Kinetics Localized Thermal Analysis Nanocomposites
Authors:T. Malavašič, U. Osredkar, I. Anžur, and I. Vizovišek
The strengths of the gel effect, and the monomer conversions at which the gel effect sets in for the polymerizations of some methacrylic acid esters, were determined at different temperatures from the courses of polymerization measured by differential scanning calorimetry. It was found that the strength of the gel effect is greatly influenced by the reaction temperature and the ester residue in the molecule of the monomer, whereas the “critical” conversion for individual monomers is practically independent of the reaction temperature in the measured interval, but is strongly dependent on the length of the ester residue.
question arose, “Is there a better method?”
A literature check uncovered no previous work using temperature modulated differential scanning calorimetry (TMDSC) for phosphorous pentasulfide free sulfur measurement. We therefore investigated if this
be monitored by isothermal (conduction) calorimetry and five stages can be distinguished, as mentioned by several researchers [ 1 , 2 ]: (i) the initial period; (ii) the induction period; (iii) the acceleration period; (iv) the deceleration period
Authors:S. H. Kandil, A. S. El-Kady, M. A. El-Gamal, and S. E. Morsi
Thermomechanical analysis, TMA, was used to evaluate the linear thermal expansion coefficient,α, of four different types of dental amalgams: Conventional lathe-cut alloy, conventional spheralloy, high copper dispersalloy and high copper ternary alloy. Dynamic thermal expansion studies showed an interesting contraction behaviour around 85 °C for conventional amalgams and 105 °C for high copper amalgams which coincided with the endotherms produced by differential scanning calorimetry, DSC, and was attributed to the existence of theγ2 andγ1 phases, respectively. Pure single phases were prepared and characterized by DSC at 210 °C forγ2 and 120 °C forγ1. When theγ2 was enriched with mercury, the decomposition endotherm showed gradual shift to lower temperatures and reached 85 °C. The value of the linear coefficient of thermal expansion ranged between 15 and 35 ppm/°C for all the investigated brands.
Authors:Sergey V. Ushakov, Divya Nag, and Alexandra Navrotsky
analyzed using thermogravimetry (TG) and differential scanning calorimetry (DSC). Based on these experiments, a thermal analysis procedure to estimate SOM loss using (Δ H comb SOM ) / (Δ H β–α Qz) was developed and tested on samples from two pile burn
Quality initiatives, such as ISO16949, require the calibration of apparatus using certified and traceable reference materials [ 1 ]. In calorimetry, standard methods and reference materials exist for the
For experimental investigation of the temperature-dependences of specific heat and thermal conductivity in the range 4–300 K a continuous-flow helium cryostat has been developed. Its adaptation for low-temperature calorimetry and its use for measurement of the temperature-dependences of the specific heats of bulk samples of metals and insulators are described in this note. The phase transition from the normal to the superconductive state has been measured on NbTi and its critical temperature determined. Two methods of determination of the temperature-dependences of the specific heats of metals and insulators have been developed. The inaccuracy of specific heat determination did not exceed 2 % with metal materials and 5 % with insulating materials.
Authors:Pieter Samyn, Gustaaf Schoukens, Leo Vonck, Dirk Stanssens, and Henk Van den Abbeele
this temperature range for a rigorous control of further processing conditions in relation to physical properties.
Thermoanalytical methods such as thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) received many
Authors:M. -H. Simonot-Grange, O. Bertrand, E. Pilverdier, J. -P. Bellat, and C. Paulin
The differential enthalpies of adsorption ofp-xylene andm-xylene on NaY, KY and BaY zeolites were measured by isothermal calorimetry coupled with isothermal volumetry at 25‡C. Whatever the zeolite, the enthalpies of adsorption ofp-xylene andm-xylene at low filling were of the same order of magnitude. They did not show significantly the effect of the dipolar moment ofm-xylene. Their absolute values varied in the sequence