Adsorption of Poly(ethylene oxide)–Poly(lactide) Copolymers. Effects of Composition and Degradation

Muller, Dries; Carlsson, Fredrik; Malmsten, Martin

doi:10.1006/jcis.2000.7329

Cited by 5 publications

(3 citation statements)

References 42 publications

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“…Both PLA and PLA/PEO copolymers are well-established biomaterials because of their well-proven biocompatibility and degradability of the PLA chains. Few studies deal with adsorption of PEO-PLA copolymers on model hydrophobic surfaces [27,28]. The authors of the present work are not aware of any published study dealing with direct adsorption of polyester/PEO block copolymers on a polyester surface.…”

Section: Introductionmentioning

confidence: 77%

Adsorption of poly(ethylene oxide)–block–polylactide copolymers on polylactide as studied by ATR-FTIR spectroscopy

Popelka

Machová

Rypáček

2007

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 77%

Adsorption of poly(ethylene oxide)–block–polylactide copolymers on polylactide as studied by ATR-FTIR spectroscopy

Popelka

Machová

Rypáček

2007

Journal of Colloid and Interface Science

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“…For example, C 12 E 5 is modeled as B 12 A 15 . The interaction parameters RT χ(species,A) were taken to be RT χ(species,A) = RT χ(species,EO)/3, where the latter were previously used to describe the interaction involving an EO group. , The RT χ(water,B) parameter was adjusted to obtain a similar calculated adsorbed amount for C 12 E 5 as the experimentally obtained value at the cmc obtained from ellipsometry measurements.…”

Section: Model Calculationsmentioning

confidence: 99%

Surface Properties of Tetra(ethylene oxide) Dodecyl Amide Compared with Poly(ethylene oxide) Surfactants. 1. Effect of the Headgroup on Adsorption

2002

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The surfactant tetra(ethylene oxide) n-dodecyl amide (TEDAd) was compared with the poly(ethylene oxide) n-alkyl ethers C12E5, C10E5, and C12E4. The adsorption to hydrophobic liquid-vapor and solidliquid interfaces, as well as the wetting behavior on a hydrophobic surface, was investigated. The amide group is more hydrophilic than the ethylene oxide group, raising the cloud point and critical micelle concentration (cmc). The incorporation of an amide group decreases the adsorbed amount at a fixed surfactant concentration. For all studied surfactants, the adsorbed amount was significantly lower on the solidliquid interface than on the liquid-vapor interface at a fixed concentration below the cmc, but the maximum adsorbed amount was only slightly lower on the solid-liquid interface. The surface pressure vs area/ molecule isotherms reveal attractive interactions between the amide groups in the adsorbed layer, which reduces the surface pressure at a fixed area/molecule. The advancing contact angles were only dependent on the surface tension at the liquid-vapor interface for C12E5 and TEDAd. The calculated adsorbed amount from the advancing contact angle agreed with the adsorbed amount on the liquid-vapor interface, while the adsorbed amount calculated from the receding contact angle was closer to the equilibrium value obtained with ellipsometry on the solid-liquid interface. The experimental results are supported by mean-field lattice model calculations, and due to the unfavorable interaction between the hydrocarbon region and the amide group in the adsorbed layer, the boundary between the hydrophobic and hydrophilic regions in the adsorbed layer becomes better defined in the presence of an amide group. This might be one of the explanations for the differences found in surface force measurements, and this will be described in part 2 of this investigation.

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“…Muller et al studied the behavior of similar copolymers, i.e., poly(ethylene oxide)- b -poly( d , l -lactide) (PEO- b -PLA), at the surface of both hydrophilic and hydrophobic silica. − To the best of our knowledge, no report has been published on the adsorption of PEO- b -P(M)CL copolymers at solid surfaces.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Poly(ethylene oxide)-b-poly(ε-caprolactone) Copolymers at the Silica−Water Interface

et al. 2005

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The adsorption of amphiphilic poly(ethylene oxide)-b-poly(epsilon-caprolactone) and poly(ethylene oxide)-b-poly(gamma-methyl-epsilon-caprolactone) copolymers in aqueous solution on silica and glass surfaces has been investigated by flow microcalorimetry, small-angle neutron scattering (SANS), surface forces, and complementary techniques. The studied copolymers consist of a poly(ethylene oxide) (PEO) block of M(n) = 5000 and a hydrophobic polyester block of poly(epsilon-caprolactone) (PCL) or poly(gamma-methyl-epsilon-caprolactone) (PMCL) of M(n) in the 950-2200 range. Compared to homoPEO, the adsorption of the copolymers is significantly increased by the connection of PEO to an aliphatic polyester block. According to calorimetric experiments, the copolymers interact with the surface mainly through the hydrophilic block. At low surface coverage, the PEO block interacts with the surface such that both PEO and PCL chains are exposed to the aqueous solution. At high surface coverage, a dense copolymer layer is observed with the PEO blocks oriented toward the solution. The structure of the copolymer layer has been analyzed by neutron scattering using the contrast matching technique and by tapping mode atomic force microscopy. The experimental observations agree with the coadsorption of micelles and free copolymer chains at the interface.

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Adsorption of Poly(ethylene oxide)–Poly(lactide) Copolymers. Effects of Composition and Degradation

Cited by 5 publications

References 42 publications

Adsorption of poly(ethylene oxide)–block–polylactide copolymers on polylactide as studied by ATR-FTIR spectroscopy

Adsorption of poly(ethylene oxide)–block–polylactide copolymers on polylactide as studied by ATR-FTIR spectroscopy

Surface Properties of Tetra(ethylene oxide) Dodecyl Amide Compared with Poly(ethylene oxide) Surfactants. 1. Effect of the Headgroup on Adsorption

Adsorption of Poly(ethylene oxide)-b-poly(ε-caprolactone) Copolymers at the Silica−Water Interface

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