Testing of organic matrix durability in photochemical ageing using ablation measurements

Guillot, L.; Monney, L.; Dubois, C.; Chambaudet, A.

doi:10.1016/s0141-3910(01)00010-6

Cited by 5 publications

(4 citation statements)

References 6 publications

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“…The plastic foil was cured for 2 h in a SUNTEST CPS Heraeus cell. In this device, the samples were irradiated using a xenon arc lamp equipped with filters and reflectors for the selection of UVvisible radiation (300 nm ϽϽ800 nm) emitted by the lamp (31). This irradiation cell was also equipped with ventilation, thus allowing polymerization of the CR-39 at an almost constant temperature of 44 Ϯ 2ЊC under an average light energy density of 85 Ϯ 5Wm Ϫ2 (31).…”

Section: Curing Proceduresmentioning

confidence: 99%

Production and Validation of CR-39-Based Dishes for α-Particle Radiobiological Experiments

et al. 2005

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The study of radiobiological effects induced in vitro by low fluences of alpha particles would be significantly enhanced if the precise localization of each particle track in the cell monolayer was known. From this perspective, we developed a new method based on tailor-made UV-radiation-cured CR-39, the production of which is described. Its validation both as a petri dish and as solid-state nuclear track detectors is demonstrated. With respect to the demands on solid-state nuclear track detectors in such experiments, these biologically compatible detectors have a controlled micrometric thickness that allows them to be crossed by the alpha particles. In this study, we present a method for obtaining 10-mum-thick CR-39, its chemical characterization, and its properties as a solid-state nuclear track detector under the environmental conditions of radiobiological experiments. The experimental studies performed with 3.5 MeV alpha particles show that their transmitted energy is sufficient enough to cross the entire cellular volume. Under optimal conditions, etched tracks are clearly defined 2 h after etching. Moreover, the UV-radiation-cured CR-39 represents an essentially zero background that is due to the short time between the production and use of the polymer. Under a confocal microscope, this thin solid-state nuclear track detector allows the precise localization of the impact parameter at the subcellular level.

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Section: Curing Proceduresmentioning

confidence: 99%

Production and Validation of CR-39-Based Dishes for α-Particle Radiobiological Experiments

et al. 2005

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“…To capture numerically the very thin surface oxidation zone that develops upon exposure, front-tracking strategies are used to calculate the rate of movement of the oxidation and ablation fronts, the positions of which define the width of the oxidation zone. Simulations with the model for epoxy-amine coatings are compared with three experimental data series obtained by Nguyen et al, 12 Rezig et al, 13 and Guillot et al 14 (the latter with data also available in Monney et al 15 ), which include transient mass loss and thickness reduction data as well as infrared measurements of carbonyl groups in the oxidation zone. These experimental data, supplemented by other investigations, allow a thorough verification of the model and many of the underlying assumptions (a similar approach was used to model simultaneous solvent evaporation and chemical curing in thermoset coatings 16 ).…”

Section: Quantification Of Rate Phenomena and Mathematical Modelmentioning

confidence: 99%

“…The last experimental data set is taken from Guillot et al 14 who studied the ablation of a pigment-free epoxy-amine coating during exposure by a Xenon lamp with filters that remove infrared radiation.…”

Section: (Clearcoat)mentioning

confidence: 99%

“…1 The model of this work is able to handle both a UV radiation and oxygen permeability limited zone thickness. The Beer-Lambert law (equation 16) takes into account absorption of UV radiation and the fronttracking equation for the oxidation front (equation 14) handles the effect of oxygen. Which mechanism dominates is simply a matter of the parameter values provided to the model.…”

Section: Analysis Of Rate Phenomena Potentially Influencing the Oxidamentioning

confidence: 99%

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Model-based analysis of photoinitiated coating degradation under artificial exposure conditions

Kiil

2012

J Coat Technol Res

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Coating degradation mechanisms of thermoset coatings exposed to ultraviolet radiation and humidity at constant temperature are investigated. The essential processes, photoinitiated oxidation reactions, intrafilm oxygen permeability, water absorption and diffusion, reduction of crosslink density, and development of a thin surface oxidation zone are quantified and a mathematical model for degrading coatings developed. Front-tracking techniques are used to determine the rate of movement of the oxidation and ablation fronts, the positions of which define the extension of the surface oxidation zone. Three previous and independent experimental investigations with two-component, densely crosslinked, epoxy-amine model coatings were selected for verification of the mathematical model. Simulations can match and explain transient mass loss and coating thickness reduction data and are in agreement with infrared measurements of carbonyl groups formed in the surface zone. The thickness of the stable surface oxidation zone, which is established after an initial ablation lag time, is estimated by the model to 0.5-2 lm in good agreement with previous measurements. Simulated concentration profiles of active groups, oxygen, and radicals in the stable surface oxidation zone are presented and analyzed. The mathematical model can be used for obtaining a quantitative insight into the degradation of thermoset coatings and has potential, after further development, to complete commercial coatings and dynamic exposure conditions, to become a supplementing tool for predicting in-service coating behavior based on accelerated laboratory measurements.

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Comparative effects of humid tropical weathering and artificial ageing on a model composite properties from nano- to macro-scale

Bélec

Nguyen

et al. 2015

Composites Part A: Applied Science and Manufacturing

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Testing of organic matrix durability in photochemical ageing using ablation measurements

Cited by 5 publications

References 6 publications

Production and Validation of CR-39-Based Dishes for α-Particle Radiobiological Experiments

Production and Validation of CR-39-Based Dishes for α-Particle Radiobiological Experiments

Model-based analysis of photoinitiated coating degradation under artificial exposure conditions

Comparative effects of humid tropical weathering and artificial ageing on a model composite properties from nano- to macro-scale

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