Influence of film processing conditions on the morphology of polyamide 6: Consequences on water and ethanol sorption properties

Sabard, Mathieu; Gouanvé, Fabrice; Espuche, Éliane; Fulchiron, René; Seytre, Gérard; Fillot, Louise-Anne; Trouillet-Fonti, Lise

doi:10.1016/j.memsci.2012.05.048

Cited by 40 publications

(29 citation statements)

References 53 publications

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“…For all the analyzed membranes, there are two endothermic peaks corresponding to the two crystalline phases existing, in approximately, 220 °C related to the α phase and in 210 ºC related to the γ phase. The adding of clay improves the barrier properties of the films, however induces the appearance of γ phase [46][47][48][49] . In Table 1, there are variations in the degree of crystallinity of the nanocomposite membranes when compared with the membrane PA6.…”

Section: Water Permeability and Oil Retentionmentioning

confidence: 99%

Hybrid Membranes of Polyamide Applied in Treatment of Waste Water

et al. 2017

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In this work, it was prepared hybrid membranes of polyamide6 (PA6) with montmorillonite (MMT) and porogenic agent (CaCl 2 ). The hybrid membranes with CaCl 2 were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), porosimetry by mercury intrusion (PMI), flux measurements and rejection. By means of X-ray diffraction, it was revealed that the hybrid membranes with CaCl 2 have an exfoliated and/or partially exfoliated structure. For FTIR and DSC of hybrid membranes with CaCl 2 , it was found that the spectra and the crystalline melting temperature remained virtually unchanged compared to PA6 membrane. From the SEM images, it was observed that the addition of the MMT and the CaCl 2 in the membrane of PA6 caused an increase in the amount of pores the surface and cross section of these membranes. By PMI, it was observed that the presence of MMT and CaCl 2 in the membrane caused an increase in the average diameters of pores. The water-oil separation tests, indicated a significant reduction of oil in the permeate, allowing treatment of wastewater contaminated with oil.

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Section: Water Permeability and Oil Retentionmentioning

confidence: 99%

Hybrid Membranes of Polyamide Applied in Treatment of Waste Water

et al. 2017

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“…These reasons explain the number of studies about the water diffusion in polyamides. The great part of them is focused on establishing the diffusion mechanisms, considering the physical consequences of water sorption and evaluating the water diffusion rate [11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…Notwithstanding the research reported, water diffusion mechanisms are still controversial. The phenomenon has been linked to free volume [11,12], to the formation of hydrogen bonds between water and the polymer [13,14] or to cluster formation [15][16][17][18]. To our knowledge, there is not any study about the water diffusivity in CNT nanocomposites using a blend of immiscible polyamides as matrix.…”

Section: Introductionmentioning

confidence: 99%

Water sorption of PA12/PA6/MWCNT composites with a segregated conductive network: structure–property relationships

et al. 2016

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The structure-properties relationships of a polyamide 12 (PA12)/polyamide 6 (PA6) blend containing multiwalled carbon nanotubes have been investigated as a function of nanofiller amount. The influence of the filler content in the water diffusion behavior of the immiscible PA12/PA6 blend is studied. An acceptable dispersion level of nanotubes in polymer matrix is observed by scanning electron microscopy. The water uptake at saturation, normalized to the polyamide mass, decreases, and the diffusion rate is slower in CNT composites. The enhancement is in line with the increase in stiffness measured in rheological tests. This behavior is related with the rise in the overall crystallinity of the polymer matrix and the selective migration of CNT towards PA6 (more hygroscopic than PA12). These findings display a substantial improvement in respect to the water uptake behavior of pristine PA6 and PA6/CNT composites, expanding the potential applications of composites.

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“…However, the simple tortuous path model which considers the nanocomposite as an ideal binary system can not explain some experimental observations in the literature that yield either much lower [43][44][45] or on the contrary much higher permeability values than predicted [22,[28][29][30]. New conceptual approaches consisting in considering heterogeneous materials as resulting from three phases, namely the continuous phase, the dispersed phase and the interface, have progressively come to light [22,28,30,[43][44][45][46][47]. Thus the mechanisms of gas barrier reinforcement in nanocomposites can be very complex due to the numerous factors that can significantly influence these functional properties.…”

Section: Introductionmentioning

confidence: 99%

Reinforcement of the Gas Barrier Properties of Polyethylene and Polyamide Through the Nanocomposite Approach: Key Factors and Limitations

Picard

Gérard

Espuche

2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Re´sume´-Renforcement des proprie´te´s barrie`re aux gaz de matrices polye´thyle`ne et polyamide par l'approche nanocomposite : facteurs cle´s et limitations -Dans cette e´tude, des nanocomposites sont pre´pare´s par voie fondue pour deux matrices, une matrice polyamide 6 (PA6) et une matrice polye´thyle`ne (PE), leur morphologie ainsi que leurs proprie´te´s barrie`res sont e´tudie´es. Les argiles organophiles sont choisies en fonction de la nature chimique de chacune des matrices polyme`res. Les nanocomposites pre´pare´s a`partir de polyamide 6 pre´sentent une structure exfolie´e et des proprie´te´s barrie`res ame´liore´es alors qu'une morphologie de type microcomposite ne conduisant aà ucune ame´lioration des proprie´te´s barrie`res est obtenue pour le syste`me PE/montmorillonite. Diffe´rents polye´thyle`nes modifie´s sont alors e´value´s en tant qu'agents compatibilisants pour les syste`mes PE. Les effets de la masse molaire, de la polarite´et de la fraction massique d'agent compatibilisant sur la dispersion des charges et sur les proprie´te´s barrie`res sont e´tudie´s. Un taux massique d'agent compatibilisant e´gal a`4 fois celui des charges s'ave`re eˆtre optimal pour l'ensemble des agents compatibilisants. Par ailleurs, la masse molaire des agents compatibilisants joue un roˆle primordial sur l'e´tat de dispersion des charges. Contrairement aux syste`mes PA, les proprie´te´s barrie`res des syste`mes PE ne sont pas directement relie´es a`l'e´tat de dispersion des charges mais de´pendent e´galement des interfaces charges/matrice. Les PE oxyde´s de faible masse molaire sont identifie´s comme des agents compatibilisants particulie`rement inte´ressants pour les proprie´te´s barrie`res et une optimisation pas a`pas des syste`mes est entreprise. Une combinaison de PE oxyde´de faible masse molaire et de PE greffe´anhydride male´ique de haute masse molaire conduisant a`diviser la perme´abilite´aux gaz du nanocomposite d'un facteur 2 par rapport a`la matrice PE s'ave`re particulie`rement inte´ressante.Abstract -Reinforcement of the Gas Barrier Properties of Polyethylene and Polyamide Through the Nanocomposite Approach: Key Factors and Limitations -In this study, polyamide 6 (PA6) and polyethylene (PE) nanocomposites were prepared from melt blending and a detailed characterization of the nanocomposite morphology and gas barrier properties was performed. The choice of the organoclay was adapted to each polymer matrix. Exfoliated morphology and improved gas transport Oil & Gas Science and Technology -Rev. IFP Energies nouvelles, Vol. 70 (2015), No. 2, pp. 237-249 Ó E. Picard et al., published by IFP Energies nouvelles, 2013 DOI: 10.2516 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.properties were obtained by melt mixing the polar PA6 matrix and the organoclay, whereas a microcomposite with poor...

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Influence of film processing conditions on the morphology of polyamide 6: Consequences on water and ethanol sorption properties

Cited by 40 publications

References 53 publications

Hybrid Membranes of Polyamide Applied in Treatment of Waste Water

Hybrid Membranes of Polyamide Applied in Treatment of Waste Water

Water sorption of PA12/PA6/MWCNT composites with a segregated conductive network: structure–property relationships

Reinforcement of the Gas Barrier Properties of Polyethylene and Polyamide Through the Nanocomposite Approach: Key Factors and Limitations

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