Journal of Thermal Analysis and Calorimetry

List of Papers (Total 610)

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...

Thermal stability and flammability of polyurethane foams chemically reinforced with POSS

This work reports on the thermal stability and flammability of a novel class of rigid polyurethane foams chemically modified by functionalized 1,2-propanediolisobutyl POSS (PHI-POSS) as a pendant group and octa (3-hydroxy-3-methylbutyldimethylsiloxy) POSS (OCTA-POSS) as a chemical cross-link. The foamed hybrid materials were prepared in a three-step process using a sorbitol-based...

High-temperature reactions in the Co3Cr4(PO4)6–Cr(PO3)3 system

A new dichromium(III) cobalt(II) diphosphate(V) of the formula CoCr2(P2O7)2 was detected in the Co3Cr4(PO4)6–Cr(PO3)3 system. The new compound was obtained as a result of high-temperature solid-state reactions between CoCO3, Cr2O3 and (NH4)2HPO4 as well as between Cr(PO3)3 and Co3Cr4(PO4)6. CoCr2(P2O7)2 was characterized using XRD, DTA and IR methods. Results demonstrated that...

Effect of composition and drying method on glass transition temperature, water sorption characteristics and surface morphology of newly designed β-lactoglobulin/retinyl palmitate/disaccharides systems

In the study, MDSC method was used to evaluate thermal properties of β-lactoglobulin–retinyl palmitate products enriched in disaccharides. Additionally, sorption behavior of powders was determined to define their stability. The obtained powders were also examined and visualized with scanning electron microscopy to find the relationship between food processing conditions and...

A thermal, sorptive and spectral study of HDTMA-bentonite loaded with uranyl phosphate

The influence of phosphate ions on the thermal stability of complexes obtained by adsorption of uranium(VI) on organobentonite was determined. Organoclay samples were prepared by the reaction of hexadecyltrimethylammonium bromide with bentonite. The isotherms of sorption/desorption of U(VI) from aqueous solutions containing phosphate ions onto different forms of bentonite were...

Synthesis and homogeneity range of Yb8−xYxV2O17 in the Yb8V2O17–Y8V2O17 system

New substitutional limited solid solution of the formula Yb8−xYxV2O17 and 0 < x < 4.0 was synthesised by the solid-state reaction from the mixtures of the compounds Yb8V2O17 and Y8V2O17. The monophasic samples containing Yb8−xYxV2O17 were characterised by powder XRD, DTA, IR, UV–Vis–DRS and SEM methods. The influence of the degree of Y3+ ion incorporation in the crystal lattice...

Structure analysis and thermal degradation characteristics of bio-based poly(propylene succinate)s obtained by using different catalyst amounts

Linear bio-based polyester polyols were prepared with the use of succinic acid and 1.3-propanediol (both with natural origin). As a catalyst was used tetraisopropyl orthotitanate (TPT). In order to determine the effect of various catalyst content on the thermal degradation characteristics, three different TPT amounts, as a 1.3-propanediol equivalent, were used, namely 0.1 mass...

Reinvestigations of the Li2O–WO3 system

Reinvestigations of the Li2O–WO3 system have been performed with the help of DTA–TG, XRD, IR and UV–Vis–NIR/DRS measuring techniques and WO3 and Li2CO3 as a reactants. Results of investigations have shown that using applied procedure of synthesis four single phases have been obtained: Li2WO4, Li2W2O7, α-Li4WO5 and β-Li4WO5. We failed to obtain pure samples of Li2W5O16, Li2W4O13...

Influence of Gd2O3 on thermal stability of oxyfluoride glasses

The aim of the research was to determine the influence of Gd2O3 addition on the thermal stability of glasses from BaF2–NaF–Na2O–Gd2O3–Al2O3–SiO2 system. Thermal analysis was carried out using DSC method. An impact of Gd2O3 on thermal parameters such as transformation temperature (T g), onset temperature of crystallization (T x), peak crystallization temperature (T p), change of...

Blood serum DSC analysis of well-trained men response to CrossFit training and green tea extract supplementation

Differential scanning calorimetry (DSC) has been used for the detection of post-exercise changes in blood serum resulting from participation in the CrossFit (CF) training combined with green tea extract (GTE) supplementation. Blood samples from 20 well-trained men were collected at rest, immediately post-exercise and after 1 h of recovery in two trials: first before and second...

Hydrotalcite-derived Co-containing mixed metal oxide catalysts for methanol incineration

The Co–Mg–Al mixed metal oxides were prepared by calcination of co-precipitated hydrotalcite-like precursors at various temperatures (600–800 °C), characterised with respect to chemical (AAS) and phase (XRD) composition, textural parameters (BET), form and aggregation of cobalt species (UV–vis-DRS) and their redox properties (H2-TPR, cyclic voltammetry). Moreover, the process of...

New thermoplastic polyurethane elastomers based on aliphatic diisocyanate

New segmented polyurethanes (SPURs) were synthesized by one-step melt polyaddition from a poly(oxytetramethylene)diol of $\overline{M}_{\text n}$ = 1000 g mol−1 (PTMO) or a poly(hexamethylene carbonate)diol of $\overline{M}_{\text n}$ = 860 g mol−1 (PHCD) as soft segments, 5-isocyanato-1-(isocyanatomethyl)-1,3,3-trimethylcyclohexane (IPDI), and 2,2′-methylenebis[(4,1...

Analysis of flammability and smoke emission of rigid polyurethane foams modified with nanoparticles and halogen-free fire retardants

Using one-step method, rigid polyurethane foams were made, modified with developed fire retardant systems containing halogen-free flame retardants and nanofillers in the form of multi-walled carbon nanotubes or nanoscale titanium dioxide. The materials were subjected to a test using a cone calorimeter and smoke-generating chamber, and selected samples were further analyzed via...

Thermal and mechanical properties of chitosan nanocomposites with cellulose modified in ionic liquids

In this paper, ionic liquid treatment was applied to produce nanometric cellulose particles of two polymorphic forms. A complex characterization of nanofillers including wide-angle X-ray scattering, Fourier transform infrared spectroscopy, and particle size determination was performed. The evaluated ionic liquid treatment was effective in terms of nanocrystalline cellulose...

A thermogravimetric study of thermal dehydration of copper hexacyanoferrate by means of model-free kinetic analysis

The kinetics of thermal dehydration of K2x/3Cu[Fe(CN)6]2/3·nH2O was studied using thermogravimetry for x = 0.0 and 1.0. Data from both non-isothermal and isothermal measurements were used for model-free kinetic analysis by the Friedman and KAS methods. The water content was determined to be n = 2.9–3.9, plus an additional ~10% of water, likely surface adsorbed, that leaves very...

Thermal methods implementation in analysis of fine-grained rocks containing organic matter

The thermal methods, including TG and DSC techniques, were implemented to determine the composition of the fine-grained rocks with dispersed organic matter. The analyses were carried out in inert and oxidising atmosphere. The analysed samples represented Palaeozoic siltstones, shales, claystones and mudstones from Baltic Basin, Lublin Basin and Upper Silesian Coal Basin (Poland...

Investigation of hydration products of fly ash–slag pastes

The paper presents the results of the research identifying the hydration products present in hardened fly ash–slag pastes considered as alternative non-clinker binder. Thermal analysis (TG/DTG), infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were used as complementary methods. The pastes contained the binder made of two components: fly ash from circular...

Identification of polymers by means of DSC, TG, STA and computer-assisted database search

This work is about the identification of polymers by means of differential scanning calorimetry (DSC), thermogravimetry (TG) and simultaneous thermal analysis (STA) involving computer-assisted database search. One general limitation depicted is the possibility of multiple interpretations of a single measurement signal which sometimes makes definite identification difficult. It is...

Al2O3/Ni functionally graded materials (FGM) obtained by centrifugal-slip casting method

The fabrication and the characterization of Al2O3/Ni composites with a gradient distribution of the Ni particles are reported. The composites have been obtained by centrifugal-slip casting and subsequent sintering and had the shape of a hollow cylinder. TG/DTA analysis was done for the nickel powder with the addition of the dispersant used in centrifugal-slip casting as well as...