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Thermal analysis
About: Thermal analysis is a research topic. Over the lifetime, 14819 publications have been published within this topic receiving 273563 citations.
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TL;DR: In this article, the melting and freezing behavior of various heat-of-fusion storage materials is investigated using the techniques of Thermal Analysis and Differential Scanning Calorimetry.
1,455 citations
TL;DR: In this paper, an analytical expression appropriate to the crystalline-amorphous polymer pair is derived from Scott's equation for thermodynamic mixing of two polymers, indicating that the system is compatible in the molten state.
Abstract: Thermal analysis of solution cast mixtures of poly(viny1idene fluoride) (PVF2) and poly(methy1 methacrylate) (PMMA) has been carried out with various programmed temperature profiles. Results from experi- ments conducted in a quasi-equilibrium state show that PVF:! crystallizes in the mixture upon cooling. Further- more, depressions were observed in the melting and the crystallization temperatures. The melting point depression phenomenon is found to be explicable in terms of thermodynamic mixing of a crystalline polymer with an amor- phous polymer. To this end, an analytical expression appropriate to the crystalline-amorphous polymer pair is de- rived from Scott's equation for thermodynamic mixing of two polymers. From this expression the interaction pa- rameter for the polymer pair is found to be -0.295 at 16OoC, indicating that the system is compatible in the molten state. The depression of crystallization temperature which depends strongly on both the composition and the cool- ing rate is attributed to the ability of the PVF2 segments to migrate and to the change of composition in the melt during crystallization. For mixtures with a PVF2 content by weight of less than 0.5, it is possible to suppress the crystal transformation at room temperature with a moderate cooling rate. Finally, it is pointed out that because of the strong kinetic effects of cooling on the thermodynamic state of the mixture, caution should be exercised in the calorimetric study of compatibility of the polymer pair.
1,098 citations
TL;DR: MIL-125, the first example of a highly porous and crystalline titanium(IV) dicarboxylate with a high thermal stability and photochemical properties, is presented, a very promising candidate for applications in smart photonic devices, sensors, and catalysis.
Abstract: Titanium is a very attractive candidate for MOFs due to its low toxicity, redox activity, and photocatalytic properties. We present here MIL-125, the first example of a highly porous and crystalline titanium(IV) dicarboxylate (MIL stands for Materials of Institut Lavoisier) with a high thermal stability and photochemical properties. Its structure is built up from a pseudo cubic arrangement of octameric wheels, built up from edge- or corner-sharing titanium octahedra, and terephthalate dianions leading to a three-dimensional periodic array of two types of hybrid cages with accessible pore diameters of 6.13 and 12.55 A. X-ray thermodiffractometry and thermal analysis show that MIL-125 is stable up to 360 °C under air atmosphere while nitrogen sorption analysis indicates a surface area (BET) of 1550 m2·g−1. Moreover, under nitrogen and alcohol adsorption, MIL-125 exhibits a photochromic behavior associated with the formation of stable mixed valence titanium-oxo compounds. The titanium oxo cluster are back ox...
1,037 citations
TL;DR: In this paper, the thermal properties of several imidazolium salts were investigated using DSC and TGA/SDTA data, and it was observed that aluminium catalyzes the decomposition of the salts containing the inorganic fluoride anions.
963 citations
Book•
01 Jan 1964
TL;DR: In this article, a revised edition necessitated by the phenomenal growth of the field during the past decade contains 90% new material, focusing on tech niques and applications of thermal analysis.
Abstract: Contents include: Thermogravimetry. Thermobalances. Applications of thermogravimetry. Differential thermal analysis and differential scanning calorimetry. Evolved gas detection and evolved gas analysis. Spectroscopic, photometric, and optical thermal techniques. Miscellaneous thermal analysis techniques. This revised edition necessitated by the phenomenal growth of the field during the past decade contains 90% new material. Emphasis is on tech niques and applications of thermal analysis. Author now with University of Houston. -- AATA
961 citations