Quality control of the cure process of thermosetting resins by means of differential scanning calorimetry

1985 ◽  
Vol 30 (6) ◽  
pp. 1349-1357 ◽  
Author(s):  
A. Apicella ◽  
C. A. Beretta ◽  
M. A. Castiglione-Morelli ◽  
E. Martuscelli ◽  
L. Nicolais ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Quality Control ◽  
Cure Process ◽  
Scanning Calorimetry ◽  
Thermosetting Resins

Thermal Analysis of Aluminum Alloys

2019 ◽  
Author(s):  
Daniel Larouche
Keyword(s):  
Thermal Analysis ◽  
Differential Scanning Calorimetry ◽  
Quality Control ◽  
Aluminum Alloys ◽  
Isothermal Calorimetry ◽  
Curve Analysis ◽  
Cooling Curve ◽  
Scanning Calorimetry ◽  
Cooling Curve Analysis ◽  
Scientists And Engineers

Thermal analysis is applied on aluminum alloys by researchers to investigate mainly phase transformations, while it is regularly used for quality control purposes in industry. Techniques like cooling curve analysis, differential thermal analysis, differential scanning calorimetry, and isothermal calorimetry are amongst those most frequently used by scientists and engineers. These techniques will be described, and a mathematical description of the results will be developed. State-of-the-art quantification methods applied on aluminum alloys will be presented and criticized based on specific examples taken from the literature.

Differential scanning calorimetry method in quality control of semi-hard cheeses

2021 ◽  
Vol 56 (3) ◽  
pp. 39-41
Author(s):  
O.B. Rudakov ◽  
◽  
I.A. Saranov ◽  
K.K. Polyansky ◽  
Ya.O. Rudakov ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Quality Control ◽  
Scanning Calorimetry ◽  
Differential Scanning Calorimetry Method

Thermal Behavior of Epoxy Resins Cured with an Amine-Containing, Thermoplastic Poly(arylene Ether Sulphone)

1999 ◽  
Vol 19 (3) ◽  
pp. 161-174 ◽  
Author(s):  
Oriana Motta ◽  
Antonino Rocca ◽  
Valentina Siracusa ◽  
Domenico Acierno
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Behavior ◽  
Kinetic Parameters ◽  
Epoxy Resins ◽  
Curing Agent ◽  
Cure Process ◽  
Scanning Calorimetry ◽  
Arylene Ether ◽  
Diaminodiphenyl Methane ◽  
Residual Heat

Abstract In this paper we carried out the crosslinking of the tetraglycidyl-4,4′- diaminodiphenyl methane epoxy resin by using a reactive poly(arylene ether sulphone) as curing agent. Differential scanning calorimetry was used to derive the kinetic parameters of the reactions involved in the cure process and to evaluate the extent of the reaction as a function of time by measuring the total (ΔHr) and the residual heat(ΔHresid) of the resin at different curing times. A comparatively slower reaction was found to take place when the resin was cured with the poly(arylene ether sulphone) that when it was cured with the conventional curing agent 4,4′-diaminodiphenyl sulphone.

scholarly journals Differential scanning calorimetry of cocoa butter and chocolate glaze

2020 ◽  
Vol 82 (2) ◽  
pp. 154-160
Author(s):  
I. A. Saranov ◽  
O. B. Rudakov ◽  
K. K. Polansky
Keyword(s):  
Differential Scanning Calorimetry ◽  
Quality Control ◽  
Cocoa Butter ◽  
Triglyceride Composition ◽  
Oil Products ◽  
Melting Peak ◽  
Scanning Calorimetry ◽  
Temperature Range ◽  
Cocoa Butter Equivalents ◽  
Dsc Method

Nowadays there is a wide market for cocoa butter equivalents, substitutes and improvers for the confectionery and dairy industries. An urgent task is the development of operational instrumental methods for cocoa butter and its substitutes quality control. Thermophysical parameters are among the most important characteristics of the fat phase for the food technology. Differential scanning calorimetry (DSC) is becoming one of the most promising methods for analytical control of fat and oil products. Thermophysical data (temperatures of the maximums of endothermic peaks and their areas) for cocoa butter and chocolate glaze typical samples applied at dairy processing enterprises of the Central black soil region for the production of chocolate glazed curd bars were obtained in the work performed with its help. DSC data were compared with chromatographic data on triglyceride composition of the fat phase of cocoa butter, cocoa butter equivalents, lauric and non-lauric substitutes, and POP and SOS cocoa butter improvers. It was shown that the DSC method can control the quality of cocoa butter and chocolate glaze, identify chocolate products of different origin and triglyceride composition. Melting thermograms obtained by DSC are highly sensitive to the fat phase triglyceride composition. DSC allows reliable identification of samples of cocoa butter and glaze by melting curves in the temperature range from -100 to +50 ° C. It was found that the main melting peak of cocoa butter and its substitutes, due to the presence of a certain set of triglycerides, is observed in the temperature range from -5 to +30 °C. When examining glazes, the melting peak changes: it bifurcates, expands or narrows. Additional application of computer separation of the unseparated peaks superposition on the DSC melting curves increases the information content of the method and improves the reliability of the fat phase identification. The DSC method is characterized by sample preparation simplicity, has good reproducibility and other metrological characteristics and can be an independent method for fat and oil products identifying and quality control..

Thermal Stability of N-Heterocycle-Stabilized Iodanes – A Systematic Investigation

2019 ◽  
Author(s):  
Andreas Boelke ◽  
Yulia A. Vlasenko ◽  
Mekhman S. Yusubov ◽  
Boris Nachtsheim ◽  
Pavel Postnikov
Keyword(s):  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Thermogravimetric Analysis ◽  
Systematic Investigation ◽  
Scanning Calorimetry ◽  
Thermal Stability Of

<p>The thermal stability of pseudocyclic and cyclic <i>N</i>-heterocycle-stabilized (hydroxy)aryl- and mesityl(aryl)-l<sup>3</sup>-iodanes (NHIs) through thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) is investigated. NHIs bearing <i>N</i>-heterocycles with a high N/C-ratio such as triazoles show among the lowest descomposition temperatures and the highest decomposition energies. A comparison of NHIs with known (pseudo)cyclic benziodoxolones is made and we further correlated their thermal stability with reactivity in a model oxygenation. </p>

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