Non-Fickian behavior of water absorption in an epoxy-amidoamine network

Brethous, Romain; Colin, Xavier; Fayolle, Bruno; Gervais, Monique

doi:10.1063/1.4949645

Cited by 5 publications

(5 citation statements)

References 15 publications

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“…More recently, the same type of behavioral deviation has been reported for an ideal epoxy-amidoamine network [27]. However, in contrast to unreacted epoxies, amide groups are not located at dangling chain extremities, but within elastically active chains.…”

Section: Water Absorption In the Presence Of Hydrolysable Groupssupporting

confidence: 65%

“…9b) leads also to a chain scission and, when two hydrolysis events take place on the same elastically active chain (i.e., at high conversion ratios), to the liberation of short macromolecular fragments (diacids) from the epoxy network. The superimposition of the resulting mass loss to the water mass uptake generates a complex sorption behavior [27]. Such behavior was already shown for aliphatic polyamides, in particular for PA 11 [28].…”

Section: Water Absorption In the Presence Of Hydrolysable Groupsmentioning

confidence: 74%

“…11. PAA is a complex amidoamine hardener resulting from the condensation of fatty acids with polyamines (mostly triethylenetetramine) [27]. Table 4 Rate constants and coefficient of water diffusion used for simulating the kinetic curves of Fig.…”

Section: Proposal Of Kinetic Modelmentioning

confidence: 99%

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Nonempirical Kinetic Modeling of Non-fickian Water Absorption Induced by a Chemical Reaction in Epoxy-Amine Networks

Colin

2017

Solid Mechanics and Its Applications

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In the last two decades, several studies made in our laboratory have shown that hydrolytic reactions may occur during water absorption and may be responsible for behavioral deviations from the classical Fick's law in epoxy-amine networks. On one hand, water is chemically consumed by specific groups initially present in the repetitive structural unit (e.g., unreacted epoxies and amides) or formed by oxidation under operating conditions. On the other hand, water establishes strong molecular interactions (hydrogen bonds) with new highly polar groups resulting from hydrolysis (alcohols and acids). Due to both contributions, the kinetic curves of water absorption no longer tend towards an equilibrium value, i.e., a final saturation plateau, but display a slow and continuous increase over time in the water mass uptake. On this basis, a diffusion/reaction model has been developed for predicting such a peculiar water sorption behavior. In addition, the classical Henry's law has been modified for describing the changes in boundary conditions during the course of the hydrolytic reaction. This chapter provides an overview of the recent theoretical advances made in this field and demonstrates, through two case studies, the good predictive value of the kinetic modeling approach set up in our laboratory.

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Section: Water Absorption In the Presence Of Hydrolysable Groupssupporting

confidence: 65%

Section: Water Absorption In the Presence Of Hydrolysable Groupsmentioning

confidence: 74%

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Nonempirical Kinetic Modeling of Non-fickian Water Absorption Induced by a Chemical Reaction in Epoxy-Amine Networks

Colin

2017

Solid Mechanics and Its Applications

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“…The Fickian diffusion model can be described by the following expression [ 17 ]:

where

is the water absorption rate of epoxy resin in the saturation state; D is the coefficient of water diffusion, which is proportional to the slope S of the water sorption curve at the origin. The relation between D and S can be expressed by the following expression:

…”

Section: Resultsmentioning

confidence: 99%

Hygrothermal Aging Characteristics of Silicone-Modified Aging-Resistant Epoxy Resin Insulating Material

et al. 2021

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To study the improvement effect of silicone materials on the hygrothermal resistance of epoxy resin and the aging mechanism of silicone-modified insulation materials under hygrothermal conditions, diphenylsilanediol was added to epoxy resin as a modifier in various quantities to synthesize silicone-modified epoxy resin, and a hygrothermal aging test was carried out. Water sorption, surface contact angles and dielectric properties of the insulation material were measured, and scanning electron microscope (SEM), Fourier-transform infrared spectrometry (FT-IR) and frequency domain spectroscopy (FDS) were used to analyze the results. The results showed that under 10 wt%, the silicone-modified insulation materials exhibited lower absorption rate and better dielectric properties, including lower dissipation factors and lower dielectric constant during the hygrothermal aging process, while epoxy resin modified with excessive silicone material tend to show worse dielectric performance. Closer analysis found that diphenylsilanediol decreases the size of the cracks within the material during hygrothermal aging, indicating that cracks generated during the hygrothermal aging process may be the reason for the worse dielectric performance, and diphenylsilanediol improves the hygrothermal aging resistance mainly by slowing down the generation and growth rate of cracks. FT-IR results confirmed the existence of hydrolysis and found that the rate of hydrolysis does not change with the content of diphenylsilanediol. FDS results also indicated that modified materials contain less dipoles after hygrothermal aging.

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“…However, in the case of the nanocomposite, the Fickian diffusion theory is not fully explored. Together with other issues, such as hydrolysis of matrix and bleaching of fibers, non-Fickian diffusion models were proposed [25]. Minelli et al have suggested that the geometry and orientation of nano-additives would affect the diffusion process [26].…”

Section: Introductionmentioning

confidence: 99%

Durability sensor using low concentration carbon nano additives

Liu

Lafdi

Chinesta

2020

Composites Science and Technology

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In this paper, nanocomposite durability sensors were developed in order to detect the diffusion of chemicals in real-time. Polymer nanocomposite based sensors usually consist of conductive nano-additives such as CNT (carbon nanotube), graphene, carbon black, silver nanoparticles, etc. However, these nanocomposite sensors use a high content of nanomaterials to ensure good conductivity. In this study, a special approach for a chemical sensor with a low concentration (0.1 wt%-2 wt%) carbon nano-additive was carried out and tested in the 1[M] H 3 PO 4 solution. Responding time and electrical resistance of each stage were analyzed against the nano-additives' concentration. The sensing behavior is represented by the decrease of electrical resistance from 100 MΩ level to 100 Ω level. A numerical multi-stage model was developed to evaluate the formation of the conductive network and its sensing property. The modeling work shows two major parameters affect the sensing behavior:(1) The aspect ratio of conductive nano-additive. (2) Diffusion coefficient ratio of different ions in different phases.

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Non-Fickian behavior of water absorption in an epoxy-amidoamine network

Cited by 5 publications

References 15 publications

Nonempirical Kinetic Modeling of Non-fickian Water Absorption Induced by a Chemical Reaction in Epoxy-Amine Networks

Nonempirical Kinetic Modeling of Non-fickian Water Absorption Induced by a Chemical Reaction in Epoxy-Amine Networks

Hygrothermal Aging Characteristics of Silicone-Modified Aging-Resistant Epoxy Resin Insulating Material

Durability sensor using low concentration carbon nano additives

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