Evaluation by thermogravimetry of the interaction of the poly(ethylene terephthalate) with oil-based paint

Dias, Diógenes dos Santos; Crespi, Marisa Spirandeli; Ribeiro, Clóvis Augusto; Kobelnik, Marcelo

doi:10.26850/1678-4618eqj.v40.1.2015.p77-85

Cited by 6 publications

(4 citation statements)

References 31 publications

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“…These polymers were evaluated in an a-alumina crucible. In addition, the kinetics study of these geomembranes was performed using the Flynn-Wall-Ozawa and Capela-Ribeiro methods, which are isoconversional methods [24][25][26].…”

Section: Thermoanalytical Methodsmentioning

confidence: 99%

Thermoanalytical and dynamic mechanical analysis of commercial geomembranes used for fluid retention of leaching in sanitary landfills

Valentin

Silva

Kobelnik

et al. 2018

J Therm Anal Calorim

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Studying thermal behavior is very important for monitoring the quality of polymers on an industrial scale. Commercial geomembranes are materials with low permeability that can be used for multiple purposes, such as geotechnical engineering in liners for potable water. They can also be used as liners for waste liquid, e.g., sewage sludge and soil coverings for landfills. In this paper, the mechanical and thermal behavior of four geomembranes with thicknesses around 2.1, 1.9, 1.7 and 0.8 mm, sold in Brazil by different companies, was evaluated. Thickness, density, tension, puncture and tear resistance and carbon black content were used to characterize the properties of these materials. Thermogravimetry, differential thermal analysis, differential scanning calorimetry (DSC) and dynamical mechanical analysis (DMA) were used to examine the evolution of these geomembranes thermal behavior. Moreover, activation energy of the thermal decomposition was estimated from non-isothermal kinetics. The results obtained by thermogravimetry showed that the geomembranes have a different thermal behavior from each other. Data obtained by DSC showed a widening of the melting peak after the second heating. Activation energy values obtained by the Flynn-Wall-Ozawa and Capela-Ribeiro isoconversional methods for each sample showed variations between them. Based on the DMA experiment, the store modulus (E 0), loss modulus (E 00) and tan d showed different behaviors for the 0.8-mm sample and no significant changes in the other samples. Concerning the mechanical properties, it can be observed that the density and black carbon data have compatible values between the samples.

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Section: Thermoanalytical Methodsmentioning

confidence: 99%

Thermoanalytical and dynamic mechanical analysis of commercial geomembranes used for fluid retention of leaching in sanitary landfills

Valentin

Silva

Kobelnik

et al. 2018

J Therm Anal Calorim

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“…The thermogravimetry (TG/DTG) and differential thermal analysis (DTA) were performed at an SDT 2960 (TA Instruments, USA) with heating rates of 5, 10, 20 and 30 • C min −1 under carbonic gas and synthetic air purge gases, with a flow of 100 mL min −1 . These polymers were evaluated in an α-alumina crucible in a temperature range of 30 to 600 • C. The activation energy was obtained by the Flynn-Wall-Ozawa method using the DTG curves to obtain the data [34][35][36].…”

Section: Thermal Analysis Methodologymentioning

confidence: 99%

HDPE Geomembranes for Environmental Protection: Two Case Studies

et al. 2020

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High-density polyethylene (HDPE) geomembranes have been used for different applications in engineering including sanitation, such as landfills and waste liquid ponds. For these applications, the material can be exposed to aging mechanisms as thermal and chemical degradation, even to UV radiation and biological contact, which can degrade the geomembrane and decrease the material’s durability. This paper aims to present an experimental evaluation of two exhumed HDPE geomembranes, the first was used for 2.75 years in a sewage treatment aeration pond (LTE sample) and another was used for 5.17 years in a municipal landfill leachate pond (LCH sample). Physical and thermal analyses were used such as thermogravimetry (TG), differential thermal analysis (DTA), differential scanning calorimetry (DSC) and dynamic mechanic analysis (DMA). The thermogravimetric analyses showed significant changes in the LCH sample’s thermal decomposition probably caused by the interaction reactions between the polymer and the leachate. For the DSC analyses, the behavior seen in the LTE sample was not observed in the LCH sample. In the DMA analyses, the behavior of the LTE sample storage module shows which LCH sample is less brittle. The LTE sample presented low stress cracking resistance and low tensile elongation at break, following the DMA results.

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“…The conditions used were platinum crucible, purge gases of nitrogen, and synthetic air, with heating up to 500 °C. The kinetic evaluation was performed using the Friedman Flynn-Wall-Ozawa and Ribeiro-Capela methods, with the DTG curves, which were analyzed in purge gas nitrogen (flow rate from 100 mL min -1 ), with the heating ratios of 5, 10, 20, and 30 °C min -1 (Dias et al, 2015;2021;Fonseca et al, 2018;Friedman, 1964;Kobelnik et al, 2018a;.…”

Section: Analysis Of Fatty Acid Methyl Esters (Fame) and Thermal Anal...mentioning

confidence: 99%

Oil extraction from seeds of Carica papaya L.: Obtaining the lipid profile and thermal evaluation

et al. 2023

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Carica papaya L. is frequently found in northern and northeastern Brazil, the Caribbean and Central America. The papaya seed oil was extracted using Soxhlet extraction. Its oil has low acidity, iodine index, saponification and peroxide values adequate and comparable to other commercially available vegetable oils. The lipid profile of this oil was also obtained by gas chromatography; thermal characterization was performed by thermogravimetry (TG) and differential scanning calorimetry (DSC) under various heating rates. The composition of the in-nature oil indicates that oleic and palmitic fatty acids are predominant. The DSC analysis under cooling shows that the crystallization phase of this oil is similar to olive oil, and the thermogravimetric results show the thermal decomposition under nitrogen purge gas occurs in only one stage. The activation energy was obtained applying the isoconversional methods proposed by Capela and Ribeiro, Ozawa and Friedman. The obtained kinetics data leads to a dependence on the sample mass and purge gases, which results in several kinetic patterns.

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Evaluation by thermogravimetry of the interaction of the poly(ethylene terephthalate) with oil-based paint

Cited by 6 publications

References 31 publications

Thermoanalytical and dynamic mechanical analysis of commercial geomembranes used for fluid retention of leaching in sanitary landfills

Thermoanalytical and dynamic mechanical analysis of commercial geomembranes used for fluid retention of leaching in sanitary landfills

HDPE Geomembranes for Environmental Protection: Two Case Studies

Oil extraction from seeds of Carica papaya L.: Obtaining the lipid profile and thermal evaluation

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