Accelerated testing of thermo-oxidative degradation of polyvinyl butyral

Иванов, В. М.; Zavodchikova, A. A.; Попова, Е. И.; Lazareva, O. L.; Belova, O. A.; Kryuchkov, I. A.; Bykov, E.

doi:10.1016/j.tca.2014.05.016

Cited by 20 publications

(6 citation statements)

References 16 publications

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“…This actually means that the activation energy depends on the degree of coloring (conversion degree). A similar phenomenon of the activation energy dependence on the conversion degree, in particular, is well known for the thermal decomposition processes studied by thermogravimetric analysis [33,34,35]. Based on the natural assumption that for photodegradation of the composite as well as the photo and thermal degradation of polymeric materials considered as examples in [32], the Arrhenius law is satisfied, and the activation energy E α at the conversion degree (degree of coloring), α, can be estimated by Equation (3): E α = R[(T 1 T 2 )/(T 2 − T 1 )]lnk α , where T 2 and T 1 are the temperatures at which photodegradation occurs; k α = t 2 /t 1 is the acceleration factor; t 2 and t 1 are the times at which a certain degree of conversion, α (a certain value of the color difference ΔE), is reached at temperatures T 2 and T 1 ; and R is the gas constant.…”

Section: Resultsmentioning

confidence: 68%

Reversible and Irreversible Color Change during Photo and Thermal Degradation of PolyphenyleneSulfide Composite

et al. 2019

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The effect of the light spectral composition and temperature on the change of color characteristics and reflection spectra during the irradiation of polyphenylene sulfide reinforced by short glass fibers in the SUNTEST apparatus was analyzed. The scales of reversible color change upon successive exposure to total radiation corresponding to the sunlight spectrum and to visible light wereevaluated and the possible mechanisms for the observed effects are discussed. The features of the color change upon visible light irradiation of previously thermally aged samples wereconsidered. Possible causes for deviation from the Arrhenius law during thermal aging of the composite are discussed. It wasdemonstrated that even with a significant change in color, the physicomechanical and electrotechnical characteristics of the composite only changedslightly or remained virtually at the same high level.

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Section: Resultsmentioning

confidence: 68%

Reversible and Irreversible Color Change during Photo and Thermal Degradation of PolyphenyleneSulfide Composite

et al. 2019

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“…The degradation temperature is identified at 641 K, whose decomposition products correspond mainly to butyraldehyde and acetic acid, due to the degradation of butyral and acetate units of polymer chains, respectively. At a temperature above 741 K, the sample degrades completely [ 34 , 35 ]. The presence of water was not detected, since no significant decrease in weight loss at the boiling temperature was observed.…”

Section: Resultsmentioning

confidence: 99%

Dielectric and Viscoelastic Behavior of Polyvinyl Butyral Films

Puente-Córdova,

Rentería-Baltiérrez,

López-Walle

et al. 2023

Polymers

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Dielectric and thermal properties of polyvinyl butyral (PVB) were studied in this work, using dynamic electrical analysis (DEA) at frequencies from 100 Hz to 1 MHz and temperatures from 293 K to 473 K. Two electrical relaxation processes were investigated: glass transition and interfacial polarization. Above the glass transition temperature (~343 K), interfacial polarization dominates conductive behavior in polyvinyl butyral. The framework of the complex electric modulus was used to obtain information about interfacial polarization. The viscoelastic behavior was analyzed through dynamic mechanical analysis (DMA), where only the mechanical manifestation of the glass transition is observed. The experimental results from dielectric measurements were analyzed with fractional calculus, using a fractional Debye model with one cap-resistor. We were successful in applying the complex electric modulus because we had a good correlation between data and theoretical predictions. The fractional order derivative is an indicator of the energy dissipated in terms of molecular mobility, and the calculated values close to 1 suggest a conductive behavior at temperatures above the glass transition temperature of PVB.

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“…For polymer materials suitable for the Arrhenius model, the typical value of activation energy during thermal aging is 0.75–1.6 eV, that is, 72–153 kJ mol −1 , and even Janting 28 et al have studied medical device polymer that the activation energy of thermal aging is 0.67 eV, 64.32 kJ mol −1 . Liau 21 and Ivanov 23 used the characterization method of thermogravimetry and obtained the activation energy of about 200 kJ mol −1 through rapid thermal decomposition at high temperatures. The value of activation energy obtained cannot reflect the aging process of PVB under constant temperature.…”

Section: Resultsmentioning

confidence: 99%

“…According to ref. 23 , 31 and 33 , PVB can be decomposed into n -butyraldehyde, butyric acid, acetic acid, n -butanol, and other substances under high-temperature thermal degradation.…”

Section: Resultsmentioning

confidence: 99%