Study of the degradation of a thermoset system using TGA and modulated TGA

Gracia-Fernández, Carlos; Gómez-Barreiro, S.; Ruíz-Salvador, S.; Blaine, Roger L.

doi:10.1016/j.porgcoat.2005.08.002

Cited by 26 publications

(16 citation statements)

References 14 publications

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“…TG studies of the samples were carried out at three different heating rates, and they were intentionally kept at relatively higher values, for example, 5, 10, and 15°C/min, to gather the insight into the degradation process under practically simulated conditions 36. Only one range of thermal degradation temperatures was observed for all of the compositions; this supported the proper miscibility of the phases.…”

Section: Resultsmentioning

confidence: 99%

Kinetics of thermal degradation of polysulfone/polyimide blended polymeric membranes

Rafiq

Man

Maitra³

et al. 2011

J of Applied Polymer Sci

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Flat-sheet asymmetric polysulfone (PSF)/ polyimide (PI) blended membranes were fabricated by a phase-inversion technique. The fabricated membranes were characterized by Fourier transform infrared spectroscopy, differential scanning calorimetry, and field emission scanning electron microscopy analyses. The kinetics of thermal degradation of the membranes were studied from thermogravimetric data following Friedman's kinetic approach. The thermal degradation process of the membranes followed first-order rate kinetics, and the activation energy of the thermal degradation process increased with increasing PI content of the membrane compositions.

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Section: Resultsmentioning

confidence: 99%

Kinetics of thermal degradation of polysulfone/polyimide blended polymeric membranes

Rafiq

Man

Maitra³

et al. 2011

J of Applied Polymer Sci

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“…The significantly higher decomposition end temperatures observed for methyl linoleate and methyl linolenate, together with the observation of an additional mass loss event (event 3), may result from polyunsaturation in these esters; the presence of multiple C=C bonds in the alkyl chains of methyl linoleate and methyl linolenate means that inter-and intra-molecular crosslinking can occur more readily than in methyl oleate or methyl stearate, facilitating the formation of densely crosslinked deposits. Event 3 may involve the decomposition of these deposits, given that crosslinking is well-known to afford a higher thermal stability [31].…”

Section: Resultsmentioning

confidence: 99%

Effect of Alkyl Chain Unsaturation on Methyl Ester Thermo‐Oxidative Decomposition and Residue Formation

Pillar

Ginic‐Markovic

Clarke

et al. 2009

J Americ Oil Chem Soc

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The formation of persistent residues by esters used in sheet metal-working lubricant formulations interferes with metal surface cleanliness and impairs the integrity of subsequent surface coatings. Understanding the thermal decomposition and residue formation properties of esters is therefore crucial to minimising residue formation during furnace-based cleaning and will aid in the improvement of coated metal products such as galvanised steel. The thermo-oxidative decomposition profiles of four different methyl esters were studied by Thermogravimetric Analysis (TGA) and Pressure Differential Scanning Calorimetry (PDSC). Chemical characterisation of residues remaining at different stages during the thermo-oxidative decomposition process was achieved by infrared spectroscopic analysis of TGA residue samples. Relationships between ester alkyl chain unsaturation levels and the amount/chemical nature of residue present at high temperature (500°C) were assessed. In the presence of oxygen, polyunsaturated esters decomposed to leave significantly greater amounts of thermally-stable residue, comprising of metal carboxylate and non-volatile oxygenated compounds, than more saturated esters. Given that the formation of analogous residues by more complex esters used in sheet metal-working lubricants may give rise to metal surface coating defects, the results of this study suggest that polyunsaturated esters should be avoided in lubricant formulations where preventing residue formation is of paramount importance.

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“…Besides, the solution with 10% of possibly due to the decomposition of lower molecular weight material, and the other one, between 290-490 °C (peak at 368 °C in Figure 4b), referring to the degradation of the resin material [17] of higher molecular weight formed during curing.…”

Section: Viscositymentioning

confidence: 99%

The effect of acetone addition on the properties of epoxy

et al. 2008

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In this context, the goal of this work is to study the effect of acetone solvent on the curing process as well as on the properties of epoxy matrices. Thus, acetone/epoxy solutions of different acetone concentrations, namely 0.0, 7.0, 10.0 or 13.0 wt.%, were prepared and then subjected to a mild processing route to remove acetone. Viscosimetric, thermogravimetric, tensile and morphological tests were performed in order to evaluate possible changes in the samples. In addition, Fourier transform infrared spectroscopy (FTIR) analyses were also employed in the search for changes in their molecular structure. Experimental MaterialsThe epoxy resin and the hardener used were araldite GY 251 (diglycidylether of bisphenol A, DGEBA, Huntsmann) and aradur HY 956 (Huntsmann), respectively. Acetone (Quimidrol, 99.5% purity) was the chosen solvent. MethodologyA certain amount of acetone (7.0, 10.0, or 13.0% of the resin weight) was added to the resin and the mixture was simultaneously sonicated in a Sonics Vibration (500 W) and magnetically stirred for an hour. The mixture was then subjected to heating at 50 °C for an hour and conditioned under vacuum for five hours. Finally, hardener was added to the mixture with a 5:1 (w/w) epoxy resin:hardener ratio and homogenized. The curing process took place at room tempera-

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Study of the degradation of a thermoset system using TGA and modulated TGA

Cited by 26 publications

References 14 publications

Kinetics of thermal degradation of polysulfone/polyimide blended polymeric membranes

Kinetics of thermal degradation of polysulfone/polyimide blended polymeric membranes

Effect of Alkyl Chain Unsaturation on Methyl Ester Thermo‐Oxidative Decomposition and Residue Formation

The effect of acetone addition on the properties of epoxy

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