Journal of Thermal Analysis and Calorimetry

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List of Papers (Total 577)

Poly(trimethylolpropane trimethacrylate) modified with esters derivatives of 3-phenylprop-2-en-1-ol

The main objective of this paper was to study the influence of the diesters derivatives of naturally occurring alcohol: 3-phenylprop-2-en-1-ol, on the thermal, viscoelastic and mechanical properties of bulk poly(trimethylolpropane trimethacrylate) [poly(TRIM)]. The bulk poly(TRIM) networks were obtained by mixing trimethylolpropane trimethacrylate with 0.5, 1, 2, 3, 5, 10 and 20 ...

Heat capacity, thermal expansion, and thermal diffusivity of NaUO2BO3

In the present studies, the thermal behaviour of NaUO2BO3 has been investigated. This compound is a potential product of interaction between the coolant (Na), control rods (B4C), and the oxide fuel, which could form under accidental conditions in sodium-cooled fast reactors. The thermal expansion, the heat capacity, and thermal diffusivity of NaUO2BO3 have been measured. The ...

Enthalpy of formation of intermetallic phases from Al–Zr system determined by calorimetric solution method

Intermetallic phases represent a group of materials of unique properties. Many of those materials have found practical application, whereas others are still intensively examined. There are ten stable intermetallic phases in Al–Zr system, among which few are prospective materials to work at elevated temperature, nuclear reactors, etc. On top of that, researches are focused on ...

Model studies on the separation of Ca2+ and Nd3+ ions using ethylenediaminetetraacetic acid

Studies on the separation of calcium and neodymium ions by using ethylenediaminetetraacetic acid (H4EDTA) as a complexing agent were performed. This research was undertaken due to the possibility of H4EDTA applying to isolate rare earth elements from the solution after acidic leaching of phosphogypsum, and because of the similarity of coordination properties of calcium and ...

Limitation of thermogravimetry for oxy-combustion analysis of coal chars

A kinetic study of the oxy-combustion of chars obtained from two Polish steam coals was conducted. A comparative study was focused on the data analysis concerning oxy-combustion of coal chars collected from two thermobalances, which differed in construction, design of crucibles, sample size and gas flow direction. The influence of individual factors such as temperature, O2 ...

α-Tocopherol/AOT/alkane/water system

In this paper the calorimetric studies on α-tocopherol/AOT/alkane/water systems are presented. Structural representations of surfactant AOT (a) and α-tocopherol (b) are shown below. α-Tocopherol (antioxidant) is a form of vitamin E that is preferentially absorbed and accumulated in humans. AOT is an anionic type of surfactant. Its molecule contains two non-polar hydrocarbon tails ...

Investigation of the thermal properties of glycidyl methacrylate–ethylene glycol dimethacrylate copolymeric microspheres modified by Diels–Alder reaction

The study describes the thermal properties of functional microspheres composed of glycidyl methacrylate (GMA) and crosslinking agent ethylene glycol dimethacrylate (EGDMA). Copolymeric poly(GMA-co-EGDMA) microspheres were prepared via suspension–emulsion polymerization in the presence of toluene and decan-1-ol as porogens. In order to introduce functional groups, the porous ...

Application of thermal imaging to assess the superficial skin temperature distribution after local cryotherapy and ultrasound

Thermal imaging is a safe, noninvasive, and quite low-cost technique that allows for the rapid and noninvasive recording of thermal radiation emitted by the human body. In recent years, it is increasingly used for physiotherapy monitoring. The main goal of the study was to compare the influence of two various treatments applied in two various orders, namely local cryotherapy (CRYO) ...

Hydration, carbonation and thermal stability of hydrates in Ca7−xSrxZrAl6O18 cement

This paper studies hydration stages and phase transformation mechanism of the Sr2+-doped calcium zirconium aluminate cement at room temperature. Features of different hydration stages of this cement paste are identified by X-ray diffraction, scanning electron microscopy, differential thermal analysis, thermogravimetric analysis, evolved gas analysis and heat evolution test. It was ...

Thermoanalytical studies of the ceramic-metal composites obtained by gel-centrifugal casting

Composite material with a gradient concentration of the metallic phase was prepared by the novel gel-centrifugal casting method. This method combines the consolidation of powders by the centrifugal force with the reaction of radical polymerization of an organic monomer which simultaneously proceeds within the composite slurry. The combination of the centrifugal casting with ...

Thermophysical aspects of reclaimed moulding sand addition to the epoxy-SO2 coremaking system studied by Fourier thermal analysis

The most important advantage of foundry purpose moulding sand is that it can be reclaimed and reused through the casting manufacturing process. Supplying the foundry with a new source of material, sand reclamation brings along both environmental and economic advantages. Utilization of used sand can be considered as a common technological routine in the production of most types of ...

The effect of different binder levels on the heat absorption capacity of moulding mixtures made by the phenolic urethane cold-box process

The phenolic urethane cold-box (PUCB) process was first introduced to the foundry industry in the late 1960s. Since then, it has become one of the most popular methods to make foundry purpose sand moulds and cores, utilized in the manufacturing of aluminium and cast iron cast components. The factors to be considered, affecting the general performance of a PUCB moulding mixture, are ...

Synthesis, structure and properties of poly(ester-urethane)s obtained using bio-based and petrochemical 1,3-propanediol and 1,4-butanediol

In this paper, the poly(ester-urethane)s obtained using petrochemical and bio-based chain extenders were prepared and characterized. The influence of glycols’ origin on the chemical structure, mechanical and thermal properties of the prepared polyurethanes was studied. The materials were synthesized by prepolymer method. The first step involved the reaction of ...

Origin of PYX thermal stability investigation with calorimetric and spectroscopic methods

2,6-Bis(picrylamino)-3,5-dinitropyridine (PYX) is a highly thermostable explosive. The examination of its thermal decomposition was conducted, and kinetic parameters of the decomposition reaction were determined. Their values for the initial conversion degree (α = 0.02) and hermetic conditions are a E a = 261 ± 11 kJ mol−1, logA = 18.09. Volatile semi-products are formed during PYX ...

Experimental study on kinetics of coal char–CO2 reaction by means of pressurized thermogravimetric analysis

Comprehensive kinetic studies were performed to establish the validity of many kinetic expressions that describe the behavior of char samples during pressurized gasification toward CO2. The gasification experiments were carried out isothermally in a high-pressure thermogravimetric analyzer (TG-HPs, TA Instruments, USA). Two char samples derived from Turów lignite B and Janina ...

Thermal analysis in foundry technology

In this study, a polymer composition of poly(acrylic acid) and dextrin (PAA/D) cross-linked with microwave radiation, belonging to the new BioCo group of environmentally friendly foundry binders, was subjected to thermal analysis (TG–DTG–DSC, TG–MS, TG–IR) in a temperature range of 20–600 °C. A thermal analysis of PAA/D compositions enables the determination of a temperature range ...

Crystal structure, phase transitions and vibrations of H2O molecules in [Ca(H2O)2](ReO4)2

One reversible phase transition at \(T_{\text{c}}^{{\text{h}}}\) = 261.2 K (upon heating) was observed for [Ca(H2O)2](ReO4)2 in the 120–300 K range. Thermal hysteresis of the phase transition temperature T C of ca. 30 K and heat flow anomaly sharpness suggest that the detected phase transition is of a first-order type. The entropy change value (ΔS ≈ 1.6 ± 0.08 J mol−1 K−1), ...

Stability of peritoneal tissue evaluated by the means of DSC in obese patients undergoing laparoscopic cholecystectomy

Obesity is considered to be the leading metabolic disease in the world. The coincidence of postoperative complications is higher in obese individuals; thus, laparoscopic techniques due to their minimally invasive character became a standard in the surgical treatment of obesity. The proper function of peritoneal tissue is essential for the response to surgical trauma. Therefore, ...

Thermo-rheological properties of coal-tar pitch modified with phenol-formaldehyde resin

Test results of changing the thermo-rheological properties of coal-tar pitch under influence of phenol-formaldehyde resin are presented in this research work. Influence of modifying agent amount and crosslinking conditions (time) of resin in bitumen was evaluated. Tests were carried out using the rheometer in oscillation mode. They enabled the evaluation of changes in bitumen ...

Thermal decomposition of binder based on etherified starch to use in foundry industry

In this work, the main purpose was the determination of the thermal stability of the modified starch: sodium carboxymethyl starch (CMS-Na) used in foundry technology as organic binder for molding sand. The analysis of the course of decomposition of the starch material under controlled heating in the range of 20–500 °C was based on the results of thermal analysis methods (TG, DTG, ...

Use of GC and PDSC methods to characterize human milk fat substitutes obtained from lard and milk thistle oil mixtures

The aim of this study was the analytical evaluations of human milk fat substitutes (HMFS) synthesized via enzymatic interesterification of lard and milk thistle oil mixtures by a immobilized commercial sn-1,3-specific lipase, using calorimetric and chromatographic methods. The mixtures of lard and milk thistle oil at mass ratio 6:4 and 8:2 were interesterified for 2, 4 and 6 h at ...

Principal component and cluster analyses as supporting tools for co-crystals detection

The application of chemometry as a solution to a range of problems in the pharmaceutical industry has been the subject of increasing interest in recent years. Therefore, the objective of this work was to assess to what extent a chemometric approach based on principal component analysis (PCA) and cluster analysis (CA) can be used as a supplementary tool for co-crystal detection ...

Colloidal processing of Al2O3 and BST materials

The paper presents the analysis of thermal stability and decomposition of Al2O3 and (Ba,Sr)TiO3 green bodies as well as commercially available organic additives which are used in shaping of ceramics by colloidal processing. The first analyzed ceramic material was Al2O3 green body obtained by gelcasting. The second examined material was elastic ceramic–polymer composite based on ...