Journal of Thermal Analysis and Calorimetry

http://link.springer.com/journal/10973

List of Papers (Total 607)

Physico-chemical characterisation of three-component co-amorphous systems generated by a melt-quench method

The purpose of this work was to evaluate the possibility of creating a ternary co-amorphous system and to determine how the properties of a co-amorphous material are altered by the addition of a selected third component. Piroxicam and indomethacin form a stable co-amorphous with the Tg above room temperature. The third component added was selected based on tendency to crystallise...

Effect of addition of plant extracts on the durability and sensory properties of oat flake cookies

Fragile cookies are one of the most popular high-fat cereal products. Products of this type with added oat flakes may be labeled with a nutrition claim and may be included in functional foods. Fat from oat flakes and which is a recipe ingredient of cookies undergoes degradation during storage which leads to the formation of harmful oxidation products and sensory changes in...

Hydroxyethyl methyl cellulose as a modifier of gypsum properties

The study is focused on the influence of a water-soluble polymer (in weight fraction up to 1.5%), cellulose derivatives—hydroxyethyl methyl cellulose, on gypsum properties. Gypsum setting involves two processes: gypsum hydration/crystallization and probably formation of a polymer film in material pores. The processes are studied by various methods such as setting time and...

Effect of grain refinements on the microstructure and thermal behaviour of Mg–Li–Al alloy

The light as-cast Mg–9Li–1.5Al alloys were manufactured and modified by 0.2 mass% Zr, commercial 0.2 mass% TiBor and 0.2 mass% AlSr master alloys. The thermal derivative analysis using UMSA platform was utilised to characterise a crystallisation process. Samples were heated up to 700 °C and then freely cooled down (~ 0.6 °C s−1) to ambient temperature in order to simulate the...

Thermal and spectroscopic studies of 2,3,5-trisubstituted and 1,2,3,5-tetrasubstituted indoles as non-competitive antagonists of GluK1/GluK2 receptors

This paper reports the thermal stability and thermal degradation of six derivatives of indole by means of TG-DSC (in air) and TG-FTIR (in nitrogen) techniques. The compounds were also characterized by infrared spectroscopy. In addition, IR spectra were calculated and compared with the experimental data. In particular, the potential energy distribution analysis was performed to...

Insight into polymorphism of the ethosuximide (ETX)

Rich polymorphism of ethosuximide compound (ETX) is described in detail using complementary thermal analysis methods. The paper shows as well the results of differential scanning calorimetry (DSC), of polarizing microscope observations (POM) and of X-ray diffraction (XRD) measurements taken using horizontal rotating capillary method. Molecular structure of ethosuximide favors...

Determination of pressure in the extradendritic liquid area during solidification

Complex-shaped lamellar graphite iron castings are susceptible to casting defects related to the volume change during solidification. The formations of these recurring defects are caused by the flow of the liquid in the intradendritic area, between the austenite dendrite arms, and in the extradendritic area between the austenite grains. The conditions for the liquid flow, in turn...

Analysis of the oxidation process of powders and sinters of the austenitic stainless steel

Nowadays, austenitic stainless steels due to its properties are widely used in various applications. In powder metallurgy technology, one of the key factors, affecting the pressing process, the sintering phenomena and the final properties of sintered parts, is the shape and particle size of the powders. The article presents the results focused on analysis of the oxidation process...

Polyurethane composites based on silsesquioxane derivatives of different structures

A series of siloxane–silsesquioxane resins with Q8 structures, as network nodes containing reactive Si–H groups in the siloxane backbone, connecting silsesquioxane moieties, were prepared in a hydrolytic condensation process and successfully functionalized by hydrosilylation of allyl alcohol. The proposed material being an alternative to the well-defined silsesquioxanes has been...

Titanium dioxide doped with vanadium as effective catalyst for selective oxidation of diphenyl sulfide to diphenyl sulfonate

Diphenyl sulfide was oxidized to sulfoxide and sulfone over V-doped TiO2 using a 30% solution of H2O2. The TiO2 samples with different intended content of vanadium (0.02, 0.05, 0.1 and 0.18 mass%) were prepared by incipient wetness impregnation. Physicochemical properties of the V-doped TiO2 were characterized by chemical analysis (ICP-OES), X-ray diffraction (XRD/in situ HT-XRD...

Thermogravimetric characterization of dark and milk chocolates at different processing stages

The effect of different processing stages of dark and milk chocolate samples on their thermal properties was investigated. The ingredients of chocolates were investigated too. Thermal behavior was evaluated by means of thermogravimetry (TG) and first-derivative thermogravimetry (DTG). The measurements were made at a temperature range of 50–700 °C with a heating rate of 10 °C min...

The influence of smartphones’ operation modes on the superficial temperature distribution in the human auricle region

In this study, the infrared thermography was used to examine heating effects in human auricle region due to short-duration use of smartphones in normal and flight mode operation by 20 healthy volunteers (age 19–24 years, 9 females and 11 males). Statistically significant differences in both modes were observed between mean temperatures of the auricle regions before and...

Optimization of mechanical properties of complex, two-stage heat treatment of Cu–Ni (Mn, Mo) austempered ductile iron

The aim of the study was to design and optimize the complex, two-step heat treatment of Cu–Ni (Mn, Mo) ductile iron. A method for the formation and investigation of austempered ductile iron (ADI) by means of complex two-step and as comparative, standard one-step heat treatments has been developed, using quenching dilatometer. Investigations of proceeding phase transformations...

Characterization of the products obtained from alkaline conversion of tuff and metakaolin

Currently, there has been a growing interest of zeolite materials for industrial and scientific purpose. Synthetic zeolites are more often used than natural ones due to its higher purity and more uniform particle sizes. Numerous investigations are conducted in searching of inexpensive raw materials suitable for zeolite synthesis. Moreover, the temperature, pressure, times and...

Thermal hazard analysis of a dehydrogenation system involving methylcyclohexane and toluene

The development of hydrogen infrastructure is important because its commercialization will help reduce carbon dioxide emissions significantly. The construction of hydrogen fueling stations will increase the demand for fuel cell vehicles. While the risk associated with various types of fueling stations has been assessed, and appropriate safety regulations have been proposed, there...

Copolymers dispersions designed to shaping of ceramic materials

The paper concerns the synthesis and the characterization of new water-thinnable binder such as poly(acrylic–styrene) with the addition of a new amphiphilic macromonomer and it application in shaping of unmodified and modified (by silanization) Al2O3 by die pressing. The organic additives decomposed thermally to non-toxic gases which is beneficial from ecological point of view...

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...

Influence of selected activating methods on hydration processes of mixtures containing high and very high amount of fly ash

Binders containing fly ash as cement substitute have been used for many years. Typical amount of fly ash in cement composite does not exceed 35% of mass of binder. Replacement of substantial amount of cement mass by fly ash results in retardation of hydration of binder and deterioration of some concrete properties, e.g. delay in setting time and reduction in early compressive...

Thermo-oxidative decomposition behavior of starch-g-poly(citronellyl methacrylate) and starch-g-poly(citronellyl acrylate) copolymers

The paper describes the studies on the thermo-oxidative decomposition behavior of two types of starch graft copolymers: starch-g-poly(citronellyl acrylate) copolymers with the grafting percent (%G): 21.3% ± 0.5, 35.8% ± 0.6 and 59.8% ± 0.3 and starch-g-poly(citronellyl methacrylate) copolymers with %G: 21.3% ± 0.4, 37.0% ± 0.2 and 51.8% ± 0.3 prepared applying the “grafting from...

The influence of POSS nanoparticles on selected thermal properties of polyurethane-based hybrids

Organic–inorganic hybrid materials, prepared via chemical synthesis route or physical blending of functionalized nanofillers within polymer matrix, have gained an increased attention in the recent years. Polyhedral oligomeric silsesquioxane (POSS) nanoparticles, due to their nanometer size and functionalization possibilities, are applied as effective modifiers—both chemical and...

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...

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...