Journal of Thermal Analysis and Calorimetry

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List of Papers (Total 578)

Reinvestigation of the DyCl3–LiCl binary system phase diagram

The phase equilibria in the DyCl3–LiCl binary system were established on the basis of differential scanning calorimetry (DSC) measurements. One compound, namely Li3DyCl6, is formed in this system. It melts congruently at 768 K with enthalpy of 51.6 kJ mol−1. DSC curves for eutectic composition and for compositions close to eutectic (on the left and right side of eutectic) are ...

Selected quality properties of lipid fraction and oxidative stability of dry dog foods under typical storage conditions

Selected quality and oxidative stability parameters of the lipid fraction were analyzed in four complete dry dog foods with different main animal-derived ingredients. The measurements were taken at the time of bag opening and repeated after 7 months of continuous storage in normal room conditions. Fatty acid (FA) content and acid value (AV) were determined, followed by subsequent ...

Thermal and spectroscopic (IR, XPS) properties of lanthanide(III) benzene-1,3,5-triacetate complexes

The metal–organic frameworks of the formula Ln(bta)·nH2O where n = 3, 4, 5 or 6; bta = benzene-1,3,5-triacetate ion: [C9H9(COO)3]3−; Ln = La(III), Nd(III), Eu(III), Tb(III), Ho(III), Tm(III), Lu(III) were synthesized by the reaction of LnCl3·xH2O with ammonium salt of H3bta acid in water solution. Insoluble water compounds crystallize in the monoclinic or triclinic crystal system, ...

Effect of alkali and alkaline earth metals addition on Ni/ZrO2 catalyst activity in cellulose conversion

This work is devoted to the investigation of the effect of alkali and alkaline earth metals addition on Ni/ZrO2 catalyst activity in high-temperature cellulose conversion. The catalysts containing 20 % of Ni and 1 % of Ca, Mg, Na and K (calculated per amount of oxide) introduced on ZrO2 surface by impregnation method were prepared. The surface properties of the investigated samples ...

Thermal analysis in foundry technology

TG–DSC thermal analysis involved two new BioCo foundry binders in the form of a composition with poly(acrylic acid) and modified polysaccharides (dextrin, sodium salt of carboxymethyl starch). Thermal analysis was conducted to determine the effect of the thermal decomposition conditions and polymer structure on the progress of degradation in terms of processes occurring in the ...

Nucleation ability of advanced functional silica/lignin hybrid fillers in polypropylene composites

Novel advanced functional silica/lignin hybrid fillers were synthesized for the purpose of their application in composites with polypropylene. The use of lignin for the production of hybrid fillers is justified due to the advantages such as reduction in cost of products, improvement in biodegradability as well as antioxidant and antimicrobial properties. The study encompasses an ...

Spectroscopic, thermogravimetric and biological studies of Na(I), Ni(II) and Zn(II) complexes of quercetin

The Na(I), Zn(II) and Ni(II) complexes with quercetin have been synthesized. The composition of these compounds was established by means of elemental and thermogravimetric analyses. To study the molecular structure of synthesized compounds, many miscellaneous analytical methods, which complement one another, were used: infrared (FT-IR), Raman (FT-Raman) and electronic absorption ...

Buffer contribution to formation enthalpy of copper(II)–bicine complex determined by isothermal titration calorimetry method

The isothermal titration calorimetry (ITC) technique supported by potentiometric titration data was used to study a buffer contribution to the formation enthalpy of copper(II)–bicine complex obtained directly from the ITC experiments. The calorimetric measurements were carried out at 298.15 K in 100 mM buffer solutions with a pH of 6. In experiments two biologically relevant pH ...

Study on crystallization phenomenon and thermal stability of binary Ni–Nb amorphous alloy

In this paper, a ribbon of binary Ni–Nb amorphous alloy was prepared by the melt spinning technique. Glass transition and crystallization phenomenon of the alloy were investigated by differential scanning calorimetry. Thermal properties of the ribbon of binary Ni–Nb upon heating and cooling were analysed by DTA at a heating/cooling rate of 0.5 K s−1 under the purified argon ...

Effect of cenospheric fillers on the flammability and fire hazard of silicone rubber composites

This paper presents the results of testing the flammability of silicone rubber composites containing fillers, such as cenospheres, cenospheres covered with iron, attapulgite, wollastonite, aluminum hydroxide and silica. In order to increase the insulating character of boundary layer, boron trioxide was incorporated into the composites of silicone rubber as a ceramization additive. ...

The effect of modified keratin on the thermal properties of a cellulosic–elastomeric material

The need for new composite materials that would exhibit good parameters such as mechanical or thermal properties, while being easily processable and able to undergo biodecomposition after its period of use, has been a great source of inspiration for modern material science. A lot of work has been done in the field of biodegradable polymeric materials throughout almost every aspects ...

Microstructure and thermal characteristics of SiC–Al2O3–Ni composite for high-temperature application

The development of the aviation industry is related to the production of new materials that can operate at high temperatures and corrosive atmospheres. The paper presents new material for application in high temperature obtained by pressing and sintering a composite made from SiC–Al2O3–Ni. Analysis of the microstructure showed high porosity, which is caused by used manufacturing ...

Synthesis of Fe8V10W16O85 by a solution method

Phase of block-type structure and formula Fe8V10W16O85 has been synthesized by a solution method using Fe(NO3)3·9H2O, NH4VO3 and (NH4)6W12O39·xH2O as a metal precursors. Brown solid obtained after evaporation of water at 60 °C has been heated in air at temperatures selected based on results of measurements with the aid of differential thermal analysis and thermogravimetric analysis ...

Selected thermal properties of polyethylene waxes

Selected thermal properties of different types of polyethylene waxes, i.e. by-products formed in ethylene low-pressure polymerization process, physically and chemically modified waxes are presented in the study. Temperatures of phase transitions and relevant thermal effects were defined using DSC method. Additionally, drop point and penetration of waxes were determined. It was ...

Physico-mechanical and thermal properties of epoxidized natural rubber/polylactide (ENR/PLA) composites reinforced with lignocellulose

The aim of the study was to prepare elastic composites of epoxidized natural rubber with polylactide that was reinforced with lignocellulose. To improve the functional properties of an ENR/PLA blend, we used lignocellulose modified with silanes and silica. The addition of silanes, particularly U511-tetraethoxysilane, improved the strength characteristics of ENR/PLA composites, ...

The influence of heat treatment on the structure and thermal properties of metallic glasses

This paper presents the structure and chosen properties of Fe-based ribbons with specified composition, after casting and heat treating. The aim of this work was to produce amorphous ribbons and study the influence of heat treatment on the structure and thermal properties before and after annealing. The base alloy ingot was prepared by induction melting of pure Fe, Co, B, Si and Nb ...

Temperature-modulated thermomechanical analysis as a potential technique for irreversible stress relaxation measurement in various cables

Temperature-modulated thermomechanical analysis (TMA) is a technique which allows for separation of the temperature-dependent thermal expansion from the time and temperature-dependent creep or stress relaxation behavior. Extrusion during the cable production process may orient and stretch polymer chains which are rapidly cooled in water. Such frozen-in stresses might relax over a ...

Furniture wood waste as a potential renewable energy source

In this study, the combustion behavior of raw waste wood from furniture and samples torrefied at temperatures of 473, 513, 553 and 593 K was investigated. TG-DTG analysis showed that the mass loss in the first stage of the process decreased with the temperature of torrefaction, whereas the temperature in the second stage increased. The influence of torrefaction and combustion ...

Dilatometric study of low-alloy steels with silicon carbide addition

Low-alloy steels produced via the traditional powder metallurgy process, using a die compaction, are currently widely used. Therefore, improving their properties is an issue that attracts much attention. The most common method of enhancing the properties of a given material is introducing additives, e.g., silicon to prealloyed low-alloy steels. It may be added through the ...

Analysis of the effect of antiwear CrN coating thickness on the evolution of thermomechanical interactions in the substrate/PVD coating system

The main goal of this study was to analyze the application possibilities of modulated temperature thermomechanical analysis (MT TMA) for the evaluation of thermomechanical interactions in substrate/PVD coating systems on the example of examination of influence of changes in thickness of a coating on internal stress evolution in these systems. As an indicator of the stress state in ...

Study of PET fibres modified with phosphorus–silicon retardants

In this study, flame-retardant poly(ethylene terephthalate) (PET) fibres were produced using a high-temperature bath method similar to dyeing fibres with disperse dyes. A mixture of aqueous solutions of silicon and phosphorus compounds was used as the flame retardant. Samples of the modified fibres were examined by thermogravimetric analysis. The residue left after limited oxygen ...

Study of thermal properties of polyethylene and polypropylene nanocomposites with long alkyl chain-substituted POSS fillers

The effect of incorporation of octakis({alkyl}dimethylsiloxy)octasilsesquioxanes molecules with n-octyl, n-octadecyl and 4-methyl-hexyl substituents on thermal properties of polypropylene (PP), low-density polyethylene (LDPE) and high-density polyethylene (HDPE) was investigated. Thermal properties of those composite materials were evaluated by means of the differential scanning ...

Impact of adsorption of poly(aspartic acid) and its copolymers with polyethylene glycol on thermal characteristic of Cr2O3

The polymer structure impact on the adsorption layer conformation formed on the chromium (III) oxide surface was investigated. As adsorbates, three macromolecular compounds were tested: poly(l-aspartic acid) homopolymer and two block copolymers containing the poly(amino acid) segments as well as the poly(ethylene glycol) ones in the chain structure. Due to the ionic nature of the ...

Effect of addition of BaO on sintering of glass–ceramic materials from SiO2–Al2O2–Na2O–K2O–CaO/MgO system

Glass–ceramic materials due to the various physical and chemical parameters have a more and more wide application in various areas of engineering. This paper presents a glass–ceramic material originating from the Al2O2–SiO2–Na2O–K2O–CaO/MgO modified by the addition of barium oxide. For the oxide composition which the molar ratio of SiO2/Al2O3 is constant and equal to 6.42, and ...