Journal of Thermal Analysis and Calorimetry

List of Papers (Total 610)

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...

Thermal stability of gamma-irradiated polyurethane/POSS hybrid materials

In this work, new version: we report essential data on the stability of gamma-irradiated polyurethanes chemically modified by octa(3-hydroxy-3-methylbutylmethylsiloxy) POSS (o-POSS) which varies from 2, 4, 6, 8 to 10 mass%. These hybrid materials were tested by isothermal (190 °C) and nonisothermal (β = 2, 3.7, 5 and 10 K min−1) chemiluminescence, and the thermal stability of...

The DSC approach to study non-freezing water contents of hydrated hydroxypropylcellulose (HPC)

The research consisted of investigation of non-freezable bound water (NFW) contents of raw hydroxypropylcellulose (HPC) Klucel® Pharm HF, MF, and LF by differential scanning calorimetry. Polymers (HF, MF and LF) used in the research differed significantly in their molecular mass and viscosity. Mixtures of HPC and low soluble salicylic acid or highly soluble sodium salicylate were...

Methodology to determine the apparent specific heat capacity of metal hydroxides for thermochemical energy storage

Thermochemical energy storage uses reversible thermochemical reactions to store and release heat, representing a promising technology for energy conservation and utilizing fluctuating renewable energy sources and waste heat. Many recent studies have focused on determination of the enthalpy of reaction of possible thermochemical materials (TCM) based on thermogravimetric analysis...

DSC as a screening tool for rapid co-crystal detection in binary mixtures of benzodiazepines with co-formers

In recent years, co-crystals have been the subject of increasing interest within the pharmaceutical industry because these new solid forms of active pharmaceutical ingredients have the ability to enhance the bioavailability of poorly water-soluble drugs with a low dissolution rate. For this reason, it is crucial to prepare co-crystals of benzodiazepines, i.e. psychoactive drugs...

Studies on the thermal properties and flammability of polyamide 6 nanocomposites surface-modified via layer-by-layer deposition of chitosan and montmorillonite

In this work, layer-by-layer assembly technique has been employed to deposit cationic chitosan (CH) and anionic montmorillonite (MMT-Na+) polyelectrolyte coatings on polyamide 6 (PA6). Without an additional surface treatment, 5, 10 and 20 bilayers of CH/MMT-Na+ were successfully adsorbed on PA6 matrix as confirmed by XRD, ATR-FTIR and SEM–EDX results. The thermal stability was...

Thermal and spectral analysis of copolymers with sulphur groups

The paper presents the synthesis, structure and polymerization of S-phenyl 2-methylprop-2-enethioate (PSM). This compound was prepared in the reaction of thiophenol with methacryloyl chloride. The obtained PSM was purified on the chromatographic column. Chemical structure of the monomer was confirmed by spectroscopic methods (ATR–FTIR, GC–MS, 1H and 13C NMR). Next bulk...

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...

Sintering behavior and thermal expansion of zirconia–titanium composites

The dilatometric and thermogravimetric methods were used to investigate the sintering conditions of 3Y–ZrO2 and 3Y–ZrO2–Ti composites. For the materials preparation, the nanometric zirconia stabilized by 3 mol% Y2O3 powder and micrometric titanium powder (3 and 10 vol%) were used. The green body samples were formed by slip casting method. The morphology of samples microstructures...

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...

Thermal and physical properties of ZrO2–AlO(OH) nanopowders synthesised by microwave hydrothermal method

Industrially relevant nanopowder was synthesised by microwave hydrothermal synthesis to obtain well-controlled composition (ZrO2–AlO(OH) system) which was found to determine a number of physical and thermal characteristics. This study reports variation of particle size, density, specific surface area (SSABET), as well as thermal behaviour of nanopowder mixtures of ZrO2–AlO(OH) in...

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...

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...

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 gel...

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...

Synthesis, thermal behaviour and some properties of CuII complexes with N,O-donor Schiff bases

The complexes of N2O2-, N2O3- and N2O5-donors Schiff bases with CuII ions in the methanol solution have been synthesized. They were characterized by elemental analysis, X-ray crystallographic techniques, spectroscopic (UV–Vis, IR) and thermal (TG, TG-FTIR) methods. The catalytic activity of the prepared complexes for the hydrogen peroxide-assisted degradation of methylene blue...

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 α,ω-dihydroxy...

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...

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 sub...

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...

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...