M. Escoubes

Université Claude Bernard Lyon 1

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M. Pinéri

CEA Grenoble

ÉE

Éliane Espuche

Ingenierie des Materiaux polymeres

Robert Gauthier

Université de Montréal

Catherine Joly

Bioingénierie et Dynamique Microbienne aux Interfaces Alimentaires

L. Rebattet

Laboratoire d'Electrochimie Moléculaire

E.M. Geniès

Laboratoire d'Electrochimie Moléculaire

J.Y. Dolveck

Biomatériaux et Bioingénierie

B. Chabert

Centre National de la Recherche Scientifique

Gisèle Boiteux

Université Claude Bernard Lyon 1

M. E. Thomas

Université Claude Bernard Lyon 1

Cooperative Institutions

Centre National de la Recherche Scientifique

Université Claude Bernard Lyon 1

CEA Grenoble

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Université Joseph Fourier

Ingenierie des Materiaux polymeres

Laboratoire de Chimie

Institut National des Sciences Appliquées de Lyon

Université Grenoble Alpes

Biomatériaux et Bioingénierie

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Effect of doping treatment on gas transport properties and on separation factors of polyaniline memebranes

Journal of Applied Polymer Science (1995)

L. Rebattet M. Escoubes E.M. Geniès M. Pinéri

Abstract Gas permeation experiments of H 2 , O 2 , CO 2 , N 2 , and CH 2 were carried out with freestanding films of the conjugated polymer polyaniline (PANi). At first annealed to remove residual solvent, PANi membranes were doped (i.e., protonated) in a strongly acidic medium (HCl 4M ), undoped in a basic medium (NH 4 OH 1 M ), and redoped in a slightly acidic medium (HCl 10 −2 M ). Protonation and deprotonation kinetics were studied by elementary analysis Gas permeation experiments were performed with the annealed, doped, undoped, and redoped PANi films. The gas transport mechanism was clearly influenced by the diffusivity factor and it obeyed a Fickian diffusion model. From the variations in permeability coefficients with the doping treatment, gases could be divided in two subgroups comprising H 2 , O 2 , and CO 2 on one hand and N 2 and CH 4 on the other. After the doping–undoping–redoping process, gas fluxes were increased by 15% for the smaller gases and were decreased by 45% for the larger gases. As a consequence gas separation factors were approximately doubled for a gas pair involving the two subgroups and these were unchanged for a gas pair involving only one subgroup. The highest O 2 /N 2 and CO 2 /CH 4 selectivity coefficients were, respectively, equal to 14 and 78. © 1995 John Wiley & Sons, Inc.

Gaseous diffusion

10.1002/app.1995.070571307

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Citations (43)

Transport properties of chitosan membranes: Influence of crosslinking

Journal of Polymer Science Part B Polymer Physics (2000)

C. Tual Éliane Espuche M. Escoubes Alain Domard

10.1002/(sici)1099-0488(20000601)38:11<1521::aid-polb120>3.0.co;2-

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Citations (111)

Gas permeability of model polyurethane networks and hybrid organic-inorganic materials: Relations with morphology

Journal of Applied Polymer Science (1997)

Celina Maria Damian Éliane Espuche M. Escoubes S. Cuney Jean‐Pierre Pascault

Various polyurethane (PU) and hybrid organic-inorganic networks based on isocyanate chemistry were synthesized using a two-stage method. All the networks were amorphous. For PU membranes the morphology and the permeability coefficients of different gases (H2, N2, O2) were a function of the polarity and the chain length of the soft segment and a function of the composition of the networks. The membranes based on the same soft segment chain length and on the same molar composition were structurally nanoheterogeneous systems for the less polar soft segments (α, ω-hydroxy-terminated hydrogenated polybutadiene and a fatty acid oligoester). They were homogeneous for a polycaprolactone type soft segment. The gas diffusion was appreciably hindered in the case of better miscibility between the soft chains and the hard crosslinks. Decreasing the soft segment length decreased the gas permeability coefficient of the network. As the chemical compositions were changed by increasing the soft segment content, an increase in permeability coefficients was observed. The morphology and transport properties of PU networks and hybrid organic-inorganic networks with low inorganic content were compared for the same soft segment content. The similarities observed between the two types of networks led us to conclude that the organic or inorganic nature of the crosslinking agent has no influence on the gas transport properties of these networks. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 65: 2579–2587, 1997

Miscibility

Barrer

Morphology

10.1002/(sici)1097-4628(19970919)65:12<2579::aid-app27>3.0.co;2-u

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Citations (13)

Determination of the permeant concentration profile in a membrane during gas permeation

Journal of Membrane Science (1989)

M. E. Thomas M. Escoubes P. Esnault M. Pinéri

Pervaporation

10.1016/s0376-7388(00)81170-9

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Citations (27)

Influence des conditions d'elaboration (avec ou sans solvant) sur les interactions de l'eau avec un composite polyepoxyde/carbone

European Polymer Journal (1990)

A. Vigier G. Lachenal M. Escoubes B. Chabert

Plasticizer

10.1016/0014-3057(90)90187-9

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Citations (7)

Sorption and interactions of gases in polyaniline powders of different doping levels

Journal of Applied Polymer Science (1995)

L. Rebattet M. Escoubes E.M. Geniès M. Pinéri

Abstract Sorption of different gases (N 2 , O 2 , CH 4 , and CO 2 ) were performed on as‐synthesized polyemeraldine base, on HCl 4 M doped, on NH 4 OH 1 M undoped, and on HCl 10 −2 M redoped powders. In the pressure range examined (100–700 torr), linear sorption isotherms were observed for N 2 and correspond to an ordinary dissolution in Henry's law state. Concerning O 2 , CH 4 , and CO 2 , nonlinear isotherms were evidenced and could be described by the dualmode sorption mechanism proposed for glassy polymers, which consists of the combination of a Henry's type dissolution with a Langmuir sorption in unrelaxed gaps between macromolecular chains. Specific interactions between polyaniline (PANi) and O 2 , CH 4 , and CO 2 , were studied. Gas permeation experiments were performed by using different upstream pressures, P 1 , and have confirmed the dissolution of Henry's type for N 2 and the dualmode mechanism for O 2 and CO 2 . From the fits of the sorption isotherms, gas solubilities of N 2 , O 2 , CH 4 , and CO 2 were calculated for three different gas pressures and analyzed in terms of gas separation for permeation experiments. © 1995 John Wiley & Sons, Inc.

10.1002/app.1995.070580509

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Citations (8)

Gas sorption and esr studies of ageing in pani-csa

Synthetic Metals (1999)

F. Genoud M. Nechtschein Patrice Rannou M. Escoubes V. Rouyer

10.1016/s0379-6779(98)00831-5

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Citations (3)

Comparison of Weight and Energy Changes in the Absorption of Water by Collagen and Keratin

ACS symposium series (1980)

M. Escoubes M. Pinéri

The collagen and keratin constitute the two most important protective fibrous proteins in living systems. The role of water in connection with these polymers in biological processes has been the object of a number of studies for more than a century but remains controversial. We have shown, in preceeding article concerning collagen (1), that the analysis of data for weight absorption and kinetics of absorption of water as studied by torsion pendulum experiment of hydrated collagen permit an improvement on literature data and suggests a hydration scheme involving five stages. This article concerns collagen fibers from rat tail tendon. The object is to confirm, improve or modify the proposed model by studying different collagen samples and secondly fibrous proteins such as the a keratin of human hair which exhibits similar hydration properties. 1. Review of results on collagen fiber from rat tail tendon This type of collagen has the advantage

Collagen fiber

Collagen fibres

10.1021/bk-1980-0127.ch014

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Citations (3)

Studies of interfacial properties in polyepoxyde/carbon or glass fiber composites by means of microgravimetric techniques

Thermochimica Acta (1986)

M. Escoubes B. Chabert Daniel Sage

Carbon fiber composite

Carbon fibers

10.1016/0040-6031(86)80018-1

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Citations (2)

Quantitative determination of water sorption by plant cuticles

Plant Cell & Environment (1991)

A. Chamel M. Pinéri M. Escoubes

Abstract. The water sorption by cuticular membranes (CM) isolated from both leaves and fruit and representing different structural and chemical cuticular types, was measured over the whole range of relative humidities using a magnetic suspension microbalance. The sorption isotherms were generally not linear and sorption increased more rapidly at the highest values of relative humidity. The highest values of water content, at 80–99% r.h., measured for the seven species ranged from 1.1 to 7.7% of the dehydrated weight. Extraction of the soluble cuticular lipids did not result in a decrease of sorption, but only in a lower interspecific dispersion. There was a drastic reduction (63%) in water sorption when polymer matrix membranes (MX) were partially acid‐hydrolysed; but methylation or charging with iron of (MX) did not have any significant effect on water sorption. The data obtained are discussed in relation to cuticular permeability. Two determinants of water permeability were determined: the partition coefficient (K) relating the equilibrium Water concentration of the cuticle to that of the surrounding atmosphere; and the diffusion coefficient (D), calculated from the half‐times of the sorption process in kinetic measurements.

10.1111/j.1365-3040.1991.tb01374.x

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Citations (118)