Structural and thermodynamic study of dimethylsiloxane-ethylene oxide PDMS-PEO-PDMS triblock copolymers

Galin, Monique; Mathis, A.

doi:10.1021/ma50004a043

Cited by 51 publications

(30 citation statements)

References 18 publications

(31 reference statements)

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“…PFW is a white, odorless, water-insoluble long chain branch hydrocarbon molecule which contains 20 to 40 carbon atoms in its chain, and is used as a coating, water/moisture barrier, anti-caking and lubricating agent for paper and textiles [25][26][27][28]. PDMS-b-PEO is a nontoxic environmentally friendly hydrophilic semi crystalline diblock copolymer [29][30][31][32], which is used in order to modify the surface properties of polymers, e.g., transform a hydrophobic material into a hydrophilic one [33,34]. Figure 3 shows the scanning electron microscope images (SEM) of the original (untreated) and the modified FP coated with PFW, PDMS-b-PEO, and PFW/PDMS-b-PEO.…”

Section: Resultsmentioning

confidence: 99%

Functionalized Cellulose Networks for Efficient Oil Removal from Oil–Water Emulsions

2016

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Abstract:The separation of oil from water in emulsions is a great environmental challenge, since oily wastewater is industrially produced. Here, we demonstrate a highly efficient method to separate oil from water in non-stabilized emulsions, using functionalized cellulose fiber networks. This is achieved by the modification of the wetting properties of the fibers, transforming them from oil-and water-absorbing to water-absorbing and oil-proof. In particular, two diverse layers of polymeric coatings, paraffin wax and poly(dimethylsiloxane)-b-poly(ethylene oxide) (PDMS-b-PEO) diblock copolymer, are applied on the surface of each individual fiber by a two-step dip adsorption process. The resulting cellulose networks exhibit superhydrophilicity and underwater superoleophobicity and they are mechanically reinforced. Therefore, the described treatment makes cellulose fiber networks excellent candidates for the filtration and subsequent removal of oil from oil-in-water non-stabilized emulsions with oil separation efficiency up to 99%. The good selectivity, reproducibility, and cost effectiveness of the preparation process leads to the production of low cost filters that can be used in oil-water separation applications.

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Section: Resultsmentioning

confidence: 99%

Functionalized Cellulose Networks for Efficient Oil Removal from Oil–Water Emulsions

2016

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“…6-8,15) and for a PEO triblock with PDMS end chains. 16 Rejection of the amorphous blocks to the lamellar surfaces is readily understandable in this case since these end -chains are highly mobile; it has been theoretically analyzed 17,18 on an equilibrium thermodynamic basis. A different and more complex analogue is a family of polycaprolactone-poly (ethylene oxide) -polycaprolactone triblock copolymers examined by Perret and Skoulio~.…”

Section: Pcl Copolymermentioning

confidence: 99%

Morphology and properties of polycaprolactone‐poly(dimethyl siloxane)‐polycaprolactone triblock copolymers

Lovinger

Han

Mirau

1993

J Polym Sci B Polym Phys

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The molecular structure, crystallization, solid‐state morphology, thermal properties, and phase behavior of two copolymers consisting of a poly(dimethylsiloxane) (PDMS) mid‐block coupled to polycaprolactone (PCL) end‐blocks were investigated. Both copolymers (which differ only in the molecular lengths of the PCL end‐blocks) were found to be lamellar systems, whose core consists of PCL chains having the same crystal structure as PCL homopolymer, and whose amorphous interlayers contain the PDMS blocks and the PCL noncrystalline segments. From x‐ray and electron‐microscopy results, it is expected that the PCL blocks may be folded once in the longer copolymer and not at all in the shorter. As a result of their differing PCL lengths, the former crystallizes as regular PCL spherulites (at a growth rate reduced with respect to PCL homopolymer), whereas the latter yields only defective, immature axialites of low overall crystallinity. Electron diffraction showed that these spherulites grow preferentially along b crystallographic axis and that the PCL crystalline stems are arranged perpendicularly to their lamellae. © 1993 John Wiley & Sons, Inc.

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“…In addition, the bulk and solution phase behavior of PEO‐PDMS block copolymers has been previously investigated. Due to the strong chemical incompatibility between the blocks, these materials will microphase‐separate even at very low molecular weights. Therefore, PEO‐PDMS block copolymers are strong candidate materials for the present application: accessible T ODT (<100 °C) at low molecular weight (and therefore low melt viscosity, enabling fast “switching” kinetics), and the desired hydrophilic/hydrophobic character.…”

Section: Introductionmentioning

confidence: 99%

Coatings with thermally switchable surface energy produced from poly(ethylene oxide)‐poly(dimethylsiloxane) block copolymer films

Davis

2015

J Polym Sci B Polym Phys

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This work explores coatings with thermally switchable wetting behavior, based on block copolymers that possess both hydrophilic and hydrophobic segments. The amphiphilic block copolymers were synthesized by coupling allyl‐ended poly(ethylene oxide) (PEO) and hydride‐ended poly(dimethylsiloxane) (PDMS) oligomers via a Pt catalyst. One near‐symmetric diblock possessed an order‐disorder transition temperature (TODT) of 64 °C. When cooled through TODT in ambient air, the PDMS domains wet the film's surface, producing a hydrophobic coating with a water contact angle (CA) = 90°. However, when cooled in humidified air, hydrophilic PEO domains form at the surface, yielding CA = 30–40°. The coatings can be reversibly switched between the two states by reheating above TODT, in the appropriate environment, and then cooling, rapidly generating the desired room‐temperature surface wettability. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016, 54, 135–140

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Structural and thermodynamic study of dimethylsiloxane-ethylene oxide PDMS-PEO-PDMS triblock copolymers

Cited by 51 publications

References 18 publications

Functionalized Cellulose Networks for Efficient Oil Removal from Oil–Water Emulsions

Functionalized Cellulose Networks for Efficient Oil Removal from Oil–Water Emulsions

Morphology and properties of polycaprolactone‐poly(dimethyl siloxane)‐polycaprolactone triblock copolymers

Coatings with thermally switchable surface energy produced from poly(ethylene oxide)‐poly(dimethylsiloxane) block copolymer films

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