File:Porous polyethylene-co-octene in SEM x1200 with mysterious stains.tif

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Porous polyethylene-co-octene in SEM x1200 with mysterious stains

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Description
Français : Ce matériau a été obtenu en mélangeant 28,5 %massique de polyéthylène-co-octène, polymère proche du polyéthylène qui constitue la plupart des matières plastiques communes (sacs, bouteilles, etc.) ; 69 %massique de polyoxyéthylène, un polymère soluble dans l'eau ; et 2,5 %massique de PDMS (polydiméthylsiloxane). Avant l'observation au MEB (microscopie électronique à balayage), le polyoxyéthylène a été extrait en le solubilisant dans l'eau.

Les phase polyéthylène-co-octène et polyoxyéthylène forment un mélange co-continu, ce qui explique que l'échantillon ne se disloque pas après l'extration du polyoxyéthylène. Grâce à la technique MEB couplée aux rayons X, on a montré que le PDMS se place dans la phase polyéthylène-co-octène.

Les taches que l'on observe à la surface du polyéthylène-co-octène ne sont donc pas identifiées. Est-ce du PDMS qui se placerait à l'interface entre les deux phases co-continues (mais cela contredirait l'observation au MEB + rayons X) ? Est-ce que le PDMS est aussi sous forme de gouttes au sein du polyéthylène-co-octène (mais cela représenterait beaucoup plus que les 2,5 %massique introduits) ? Est-ce simplement l'effet de surface du polyéthylène-co-octène (mais ça n'a pas été observé dans d'autres échantillons) ?

Image prise au Centre de Microscopie Electronique Stéphanois (CMES) dans le cadre de travaux de recherche effectués au sein du laboratoire Ingénierie des Matériaux Polymères, rattaché à l'Université Jean Monnet de Saint-Etienne.
English: This sample was obtained by blending 28.5 %wt of polyethylene-co-octene, polymer similar to polyethylene of which are made most of common plastic objects (bags, bottles, etc.) ; 69 %wt of polyethylene oxide, a polymer that is soluble in water ; and 2,5 %wt of PDMS (polydimethylsiloxane). Before the SEM (scanning electron microscopy) observation, polyethylene oxide was extracted by water.

The polyethylene-co-octene and polyethylene oxide phases form a co-continuous blend, which is why the sample does not disintegrate after polyethylene oxide extraction. Using SEM coupled with X-rays, we showed that PDMS is in the polyethylene-co-octene phase.

The stains observed at the surface of polyethylene-co-octene are not identified. Is it PDMS at the interface of the two co-continuous phases (but that would contradict the X-ray observations) ? Is PDMS also in a drop shape inside polyethylene-co-octene (but that would be more than the 2,5 %wt inserted) ? Is it simply the surface of polyethylene-co-octene (but that was never observed in other samples) ?

Image taken at Centre de Microscopie Electronique Stéphanois (CMES), part of research works performed in Ingénierie des Matériaux Polymères laboratory, based in Université Jean Monnet in Saint-Etienne.
English: Porous polyethylene-co-octene in SEM x1200 with mysterious stains
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Author DaraDaraDara

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