Journal of Thermal Analysis and Calorimetry

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

List of Papers (Total 610)

Leak testing of carbon–tin nanocomposites by thermal analysis methods

Electrode materials consisted of tin nanograins encapsulated in different origin carbon buffer matrix (starch or water soluble polymer) were obtained in a simple and inexpensive process. The tin precursor was synthesized using modified reverse nanoemulsion technique (w/o) and then coated by a source of carbon. The composites precursors were pyrolysed, affording formation of C/Sn...

Influence of cytotoxic butyltin complexes with 2-sulfobenzoic acid on the thermotropic phase behavior of lipid model membranes

In the previous study, we showed that butyltin complexes with 2-sulfobenzoic acid (commonly referred to as BTsbz) exhibit a very wide biological activity. The BTsbz in vitro are very active cytotoxic agents against tumor cells—more effective than cisplatin and carboplatin (traditional anticancer drugs). These complexes are antibacterial agents against gram-positive and gram...

Thermal and structural characterization of copper(II) complexes with phenyl-2-pyridylketoxime (HPPK)

Copper(II) complexes of different nuclearity with phenyl-2-pyridylketoxime (HPPK), such as mononuclear [Cu(HPPK)(PPK)X], whereby X = NCS− (1) or NO3 − (2), dinuclear [Cu(HPPK)Cl2]2 (3) and trinuclear [Cu3(PPK)3(μ3–OH)(Cl)2]·nH2O (4) were synthesized, and their thermal properties were investigated. The studies involved gas-phase monitoring of decomposition products by infrared...

Thermal properties of poly(3-hydroxybutyrate) modified by nanoclay

Nanocomposites based on poly(3-hydroxybutyrate) (P3HB) and Cloisite®30B were prepared by direct mixing in a co-rotating twin-screw micro-extruder. The X-ray diffraction method and transmission electron microscopy allowed to identify the nanostructure. Thermal properties of the obtained nanocomposites were investigated with the use of thermogravimetry (TG) and differential...

Thermal degradation of natural and treated hemp hurds under air and nitrogen atmosphere

Sustainability goals are essential driving principles for the development of innovative materials in the construction industry. Natural fibers represent an attractive alternative as reinforcing material due to good mechanical properties and sustainability prerequisites. The study has been focused on the comparative investigation of chemical and physical treatments of hemp hurds...

Thermal and kinetic analyses on Michael addition reaction of acrylic acid

The purpose of this study is to obtain a better understanding of Michael addition reaction (MAR) which may induce runaway polymerization of acrylic acid. The heat of MAR was measured using a C80 Calvet-type heat flux calorimeter, and products of MAR were revealed by gel permeation chromatography. The reaction rate constant of MAR was obtained from kinetic analysis. In high...

Microcalorimetric analysis of methylcellulose influence on the hydration process of tricalcium aluminate, alite and their mixture

In the paper, the results of investigation concerning the influence of 0.3% addition of hydroxypropyl methylcellulose (MC) of 40 and 70 Pa s viscosity on the hydration process of main clinker phases C3S and C3A are presented. The course of hydration is documented using microcalorimetry, and formed phases were identified by XRD. The research indicated that methylcellulose...

Synthesis, thermal study and some properties of Zn(II), Cd(II) and Pb(II) compounds with mono-, di- and trichloroacetates

New complexes with formulae: Zn(CClH2COO)2·2H2O, Zn(CCl2HCOO)2·2H2O, Zn(CCl3COO)2·2H2O, Cd(CCl2HCOO)2·H2O, Cd(CCl3COO)2·2H2O and Pb(CCl3COO)2·2H2O, were prepared and characterized by chemical, elemental analysis and IR spectroscopy. The nature of metal–ligand coordination was studied. They are small crystalline. The thermal properties of compounds in the solid state were studied...

Thermal analysis of phase transitions in PbZr1−xSnxO3 antiferroelectric single crystals

The combined thermal analysis techniques thermal expansion: and differential scanning calorimetry were used to characterize various phase transitions that exist in the solid solutions of PbZr1−xSnxO3. Using thermodynamic quantities, i.e., thermal expansion and specific heat to distinguish first-order transitions from second-order ones, we demonstrate that some perovskite...

Spectroscopic (IR, Raman) and thermogravimetric studies of 3d-metal cinchomeronates and dinicotinates

In this work, the thermal and spectroscopic properties of 3d-metal (Co, Cu, Zn, Mn, Ni, Fe) and sodium salts with cinchomeronic acid (3,4-pyridinedicarboxylic acid) (3,4pda) and dinicotinic acid (3,5-pyridinedicarboxylic acid) (3,5pda) were studied. The IR and Raman spectra were registered and analyzed in the range of 400–4000 cm−1. The thermogravimetric study of synthesized...

Calorimetric study of Eu2O3–ZrO2 feedstock powders and sintered materials

The synthesis of ceramic materials based on europia–zirconia system and obtained by solid-state reaction in high-temperature vacuum press was investigated. Firstly, phase composition and calorimetric behavior of feedstock powders was investigated. The second part of the paper concerns the synthesis process of non-stoichiometric mixtures of feedstock powders prepared by four...

Influence of initial assumptions on the kinetic models of CO2 gasification of chars and cokes in solid phase

Kinetic studies of CO2 gasification of different materials were carried out using the Geneva method in an apparatus for determining the reactivity of cokes. The main purpose of these studies was parallel analysis of the Boudouard–Bell (B–B) reaction progress on the basis of both solid-phase and gaseous products combined with the mass balance of the process. The kinetic equations...

Thermal properties of TRIM–GMA copolymers with pendant amine groups

The porous copolymers of glycidyl methacrylate crosslinked with trimethylolpropane trimethacrylate were prepared in the form of regular microspheres by suspension–emulsion polymerization. In order to obtain adsorbents bearing functional groups, the porous methacrylate network was modified by subsequent reaction with diethylenetriamine. The thermal behavior of the obtained...

Influence of thermal treatment conditions on efficiency of PFA/MCM-48 composite and CMK-1 carbon replica in adsorption of volatile organic compounds

The mechanism of thermal degradation of poly(furfuryl alcohol) (PFA) deposited on the MCM-48 mesoporous silica was studied. The behaviour of the thin PFA film homogeneously dispersed on the silica surface (the material with the real PFA/MCM-48 mass ratio of 0.06) was compared to that of the 3D structure of PFA completely filling the MCM-48 channels (the material with the real PFA...

The influence of substituents position on products of dinitrotoluene isomers initial thermal decomposition

Thermal decomposition of dinitrotoluene (DNT) isomers and formed products were studied. Initial stage of thermal decomposition was the field of interests because decomposition of even a few percent of a substance may cause hazard. The generation of impurities at the initial stage of decomposition was examined on the basis of the decrease of the original substance melting enthalpy...

Synthesis, structure and properties of poly(ether-urethane)s synthesized using a tri-functional oxypropylated glycerol as a polyol

The main aim of this work was to obtain poly(ether-urethane)s using tri-functional polyoxyalkylene polyol (Rokopol G1000), which introducing the chemical cross-links into the structure of polyurethanes. Poly(ether-urethane)s were prepared using two-step method, called prepolymer method, which involves in the first step the reaction of 4,4′-diphenylmethane diisocyanate (MDI) and...

Thermal dissociation in terms of the second law of chemical thermodynamics

Starting from the relationship between Gibbs free energy and equilibrium constant of a chemical reaction (ECCR) and taking into account its temperature dependence according to Kirchhoff, Eq. (12), we arrive at the three-parametric Eq. (26). In going this way, we employ the relationship between the ECCR and the degree of conversion of the solid phase using Eqs. (20) and (21). We...

Thermodynamic analysis of indexes of operation of the engine with direct fuel injection for idle speed and acceleration

Contemporary requirements for combustion engines are aimed mainly at obtaining significant parameter values of their operation at simultaneously low fuel consumption and reduced exhaust emission. Despite the fact that combustion engines utilize diverse load conditions, the idle speed share in the whole range of their operation is significant. The percentage of combustion engines...

Yttria-stabilized zirconia–alumina composite sintering temperature effect on thermal diffusivity

Yttria-stabilized zirconia (YSZ) is one of the most common materials used for a ceramic top coat in the thermal barrier coating (TBC). The high operating temperature used in the gas turbine engines causes the stress between the top coat and the bond coat. The stress relaxation can be assured by modifications of YSZ. Hence, studies on how to modify the chemical and phase...

Thermal diffusivity characterization of bond-coat materials used for thermal barrier coatings

Thermal barrier coatings (TBC) are the system build from ceramic insulation top-coat with internal bond-coat as an interlayer between ceramic and Ni-based superalloys substrate materials. The basic role of bond-coat is reduction of thermal strain between ceramic top-coat and metallic substrates. The second role is related to improving the oxidation resistance of metallic...

Kinetics of melamine phosphate thermal decomposition in DSC studies

This paper presents the results of study of the kinetics of two-stage condensation of melamine orthophosphate to melamine pyrophosphate and subsequently to melamine polyphosphate. The investigations were conducted under non-isothermal conditions and at constant rate of sample heating. Five different heating rates were applied: 40, 20, 10, 5, 2 K min−1. The activation energy of...

Wood biomass characterization by DSC or FT-IR spectroscopy

The wood biomass obtained from four tree species: spruce, beech, willow and alder was studied. Sawdust obtained by sawing of wood was dried in a convective dryer at 80 °C, without drying-agent flow. The measurements taken with oven-drying method covered determination of initial moisture and its detailed changes during entire drying process. Both DSC curves and spectral data from...