Urgent! Développement de réseaux interpénétrés de polymères à l’interface air-eau Job Opening In France, France – Now Hiring LABORATOIRE LPPI, Université Cergy-Pontoise
Description
Ce sujet de stage de Master 2 a pour objectif d’étudier la formation de réseaux de polymères à l’interface air-eau.
Ces réseaux sont obtenus après réticulation des polymères initialement présents à la surface de l’eau sous forme de films ultraminces dits de Langmuir.
Dans le cas d’un film de Langmuir formé par un seul polymère, la réticulation conduit à la formation d’un réseau simple de polymère.
En revanche, dans le cas d’un mélange de deux polymères à l’interface air-eau, ces derniers peuvent être réticulés l’un en présence de l’autre via deux voies différentes pour obtenir des réseaux interpénétrés de polymères (RIPs).
La formation de ces architectures permet de limiter significativement la séparation de phase et de combiner les propriétés des deux polymères.
Ainsi, nous proposons d’étudier la synthèse de RIPs 2D à l’interface air-eau.
Les films ultra-minces de polymères obtenus pouvant être transférés dans un second temps sur un support solide choisi, cette méthode permet d’obtenir des revêtements de surface polymères dont les propriétés chimiques sont ajustables.
Ce travail se situe ainsi à l’intersection de la chimie des polymères, de la science des interfaces et des matériaux avancés, ouvrant des perspectives pour la mise au point de surfaces intelligentes et multifonctionnelles.
Les polymères choisis seront réticulés soit par voie radicalaire sous irradiation UV, soit par l’intermédiaire d’un agent réticulant [1,2].
Des caractérisations à l’interface air-eau seront effectuées en utilisant des isothermes de compression puis des observations de la morphologie par des techniques de microscopies spécifiques [3,4].
Pour cela, plusieurs couples de polymères sélectionnés notamment pour leur caractère hydrophobe différent seront considérés sur la base d’une étude approfondie des diagrammes de phase pression-composition déjà réalisée au laboratoire.
Ces diagrammes de phase mettent en évidence les régions de miscibilité et de séparation de phase et permettent ainsi d’identifier les conditions expérimentales les plus adaptées pour la synthèse de RIPs 2D homogènes.
La combinaison des différentes caractérisations des RIPs 2D permettra de mieux comprendre l’influence des réactions de réticulation des polymères à l’interface air-eau sur les propriétés de mélange de polymères.
Références :
This Master 2 internship aims to study the formation of polymer networks at the air–water interface.
These networks are obtained after crosslinking polymers initially spread on the water surface as ultrathin films, known as Langmuir films.
In the case of a Langmuir film formed from a single polymer, crosslinking results in the formation of a simple polymer network.
However, when two polymers are mixed at the air–water interface, they can be crosslinked in each other’s presence through two different pathways, leading to the formation of interpenetrating polymer networks (IPNs).
The construction of such architectures significantly reduces phase separation while combining the properties of both polymers.
We therefore propose to study the synthesis of 2D IPNs at the air–water interface.
The resulting ultrathin polymer films can subsequently be transferred onto a solid substrate, enabling the preparation of polymer surface coatings with tunable chemical properties.
This work lies at the crossroads of polymer chemistry, interface science, and advanced materials, and opens promising perspectives for the design of intelligent, multifunctional surfaces.
The chosen polymers will be crosslinked either by radical reactions under UV irradiation or using a crosslinking agent [1,2].
In situ characterizations at the air–water interface will be performed using compression isotherms, followed by morphological observations with specific microscopy techniques [3,4].
Several polymer pairs, selected particularly for their contrasting hydrophobic character, will be investigated based on an in-depth study of pressure–composition phase diagrams previously carried out in the laboratory.
These phase diagrams highlight miscibility and phase separation regions and thus allow us to identify the most suitable experimental conditions for the synthesis of homogeneous 2D IPNs. The combination of different characterizations of 2D IPNs will provide a better understanding of how crosslinking reactions at the air–water interface influence polymer blending properties.
Références :
[1] Vaillard, A.-S.; El Haitami, A.; Dreier, L.
B.; Backus, E.
H.
G.; Cantin, S.
Langmuir , 36, –.
[2] Haroun, F.; El Haitami, A.; Ober, P.; Backus, E.
H.
G.; Cantin, S.
Langmuir , 36, -.
[3] El Haitami, A.
; Goldmann, M.; Cousin, F.; Dosseh, G.; Cantin, S.
Langmuir , 31, –.
[4] Vaillard, A.-S.; Haitami, A.
E.; Dreier, L.
B.; Fontaine, P.; Cousin, F.; Gutfreund, P.; Goldmann, M.; Backus,
E.
H.
G.; Cantin, S.
Langmuir , 38, – .
Profile
Master en physique et/ou chimie.
Une formation ou expérience dans le domaine des matériaux polymère sera appréciée.
Master’s degree in physics and/or chemistry.
Experience in the field of polymer materials will be appreciated.
Starting date
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