Lifetime Prediction of Rubber Using the Chemiluminescence Approach and Isoconversional Kinetics

Käser, F.; Roduit, B.

doi:10.2533/chimia.2008.908

Cited by 5 publications

(5 citation statements)

References 11 publications

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“…There have been several uncommon applications of isoconversional methods that should be noted. Kaser and Roduit have employed chemiluminescence data to follow oxidative aging of rubber (cis‐1,4‐polyisoprene) in the presence and absence of a stabilizer under very slow heating rates. Isoconversional analysis of the data has revealed that addition of the stabilizer causes a change in the shape of the E α dependence and overall increase in the values of the activation energy.…”

Section: Thermal and Thermo‐oxidative Degradationmentioning

confidence: 99%

Isoconversional Kinetics of Polymers: The Decade Past

Vyazovkin

2016

Macromol. Rapid Commun.

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This article surveys the decade of progress accomplished in the application of isoconversional methods to thermally stimulated processes in polymers. The processes of interest include: crystallization and melting of polymers, gelation of polymer solutions and gel melting, denaturation (unfolding) of proteins, glass transition, polymerization and crosslinking (curing), and thermal and thermo-oxidative degradation. Special attention is paid to the kinetics of polymeric nanomaterials. The article discusses basic principles for understanding the variations in the activation energy and emphasizes the possibility of using models for linking such variations to the parameters of individual kinetic steps. It is stressed that many kinetic effects are not linked to a change in the activation energy alone and may arise from changes in the preexponential factor and reaction model. Also noted is that some isoconversional methods are inapplicable to processes taking place on cooling and cannot be used to study such processes as the melt crystallization.

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Section: Thermal and Thermo‐oxidative Degradationmentioning

confidence: 99%

Isoconversional Kinetics of Polymers: The Decade Past

Vyazovkin

2016

Macromol. Rapid Commun.

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“…Apart from the selection of external factors and their intensity, the speed of these changes is also important. Results obtained from accelerated aging give an approximate assessment of resistance to aging [ 56 , 60 , 61 , 62 , 63 ].…”

Section: Accelerated Aging Of Polymeric Materialsmentioning

confidence: 99%

Lifetime Prediction Methods for Degradable Polymeric Materials—A Short Review

2020

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The determination of the secure working life of polymeric materials is essential for their successful application in the packaging, medicine, engineering and consumer goods industries. An understanding of the chemical and physical changes in the structure of different polymers when exposed to long-term external factors (e.g., heat, ozone, oxygen, UV radiation, light radiation, chemical substances, water vapour) has provided a model for examining their ultimate lifetime by not only stabilization of the polymer, but also accelerating the degradation reactions. This paper presents an overview of the latest accounts on the impact of the most common environmental factors on the degradation processes of polymeric materials, and some examples of shelf life of rubber products are given. Additionally, the methods of lifetime prediction of degradable polymers using accelerated ageing tests and methods for extrapolation of data from induced thermal degradation are described: the Arrhenius model, time–temperature superposition (TTSP), the Williams–Landel–Ferry (WLF) model and 5 isoconversional approaches: Friedman’s, Ozawa–Flynn–Wall (OFW), the OFW method corrected by N. Sbirrazzuoli et al., the Kissinger–Akahira–Sunose (KAS) algorithm, and the advanced isoconversional method by S. Vyazovkin. Examples of applications in recent years are given.

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“…There currently exists an extensive body of literature on polymer degradation kinetics wherein the contributions typically describe a series of separate experiments, each conducted isothermally but at a different temperature across a wide range of temperatures, that are then used collectively in order to predict an expected outcome at a temperature typical of service conditions [1,[3][4][5][6][7][8][9][10][11][12][13][14][15].…”

Section: Isothermal and Non-isothermal Kineticsmentioning

confidence: 99%

Non-isothermal depolymerisation kinetics of poly(ethylene oxide)

Cran¹,

Gray²,

Scheirs³

et al. 2011

Polymer Degradation and Stability

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The depolymerization of low molecular weight poly(ethylene oxide) (PEO) under mild conditions was studied using a linear temperature ramped non-isothermal technique and the results compared with those obtained from a conventional isothermal technique. The analysis of the non-isothermal kinetic (NIK) data was performed using an original computer program incorporating an algorithm that systematically minimizes the sum of the squares of the residuals between the experimental data and the calculated theoretical kinetic profile in order to extract the kinetic parameters. The results revealed that the depolymerization of PEO proceeds in accordance with the Ekenstam model and follows the Arrhenius equation over the temperature range of ca. 40 to 130C. The NIK analysis resulted in a two-dimensional convergence to produce a unique solution set for the kinetic parameters of E a = 89.4 kJ mol -1 and A = 9.6  10 6 h -1 . These data are consistent with the results obtained from the isothermal experiments. It is proposed that NIK analysis is a quick and reliable means of obtaining kinetic parameters relevant to lifetime predictions in polymers whose degradation behaviour can be considered to be close to ideal.

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Lifetime Prediction of Rubber Using the Chemiluminescence Approach and Isoconversional Kinetics

Cited by 5 publications

References 11 publications

Isoconversional Kinetics of Polymers: The Decade Past

Isoconversional Kinetics of Polymers: The Decade Past

Lifetime Prediction Methods for Degradable Polymeric Materials—A Short Review

Non-isothermal depolymerisation kinetics of poly(ethylene oxide)

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