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• W1983004966 abstract "The surface chemistry and in-depth distribution of the composition of a poly(ethylene oxide) (PEO)-containing biodegradable poly(L-lactic acid) (PLLA) blend matrix system have been investigated using X-ray photoelectron spectroscopy (XPS). This study reports detailed quantitative compositional information using a novel numerical method for determining depth profiles. The PEO system studied is an amphiphilic Pluronic P104 surfactant, PEO-b-poly(propylene oxide) (PPO)-b-PEO. The extent of phase separation is analyzed by determining the surface enrichment of the PEO component via measurement of chemical composition at the polymer-air interface. For this blend system, the combination of the PPO component in the Pluronic surfactants drives the formation of a surface excess of Pluronic in the blends with PLLA. The surface excess profile shows a rapid increase in Pluronic surface composition versus bulk Pluronic mass fractions of 1-5%, but the profile levels off above bulk Pluronic mass fractions of 5%." @default.
• W1983004966 created "2016-06-24" @default.
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• W1983004966 date "2009-08-28" @default.
• W1983004966 modified "2023-10-16" @default.
• W1983004966 title "Phase Separation at the Surface of Poly(ethylene oxide)-Containing Biodegradable Poly(<scp>l</scp>-lactic acid) Blends" @default.
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• W1983004966 doi "https://doi.org/10.1021/la901239v" @default.
• W1983004966 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3965193" @default.
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