Self-assembly of a poly(ethylene oxide)/poly(propylene oxide) block copolymer (pluronic P104, (EO)27(PO)61(EO)27) in the presence of water and xylene

Article Abstract:

Mixtures of amphiphilic block copolymer Pluronic P104, with the formula (EO)27(PO)61(EO)27, where EO is ethylene oxide and PO is propylene oxide, exhibit specific phase behavior and microstructure at 25 degree centigrade. Distinct phase behaviors may also be observed for D2O and p-xylene. Rich phase behavior was seen in oil-in-water and water-in-oil phases. Two isotropic micellar solutions and six lyotropic liquid crystalline phases are formed. The structural length scales in the liquid crystalline phases were determined from small-angle X-ray scattering.

Phase transformations (Statistical physics), Phase transitions (Physics), Organic compounds, Ethylene, Xylene, Xylenes, Ethylene compounds

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Modification of the microstructure in block copolymer-water-"oil" systems by varying the copolymer composition and the "oil" type: small-angle X-ray scattering and deuterium-NMR investigation

Article Abstract:

Research was conducted to examine the effects of block composition on the self-assembly of amphiphilic block copolymers. The ternary phase behavior and structures of two E(SUB x)P(sub y)E(subx) copolymers having the same size P middleblock but different E end-block size, in the presence of water and either butyl acetate or butanol as selective solvents for the E and P blocks, respectively, were investigated. Results offer an insight on the tailoring of the microstructure of the amphiphile-containing systems in practical applications.

Usage, Water, Fats and oils, Oils and fats, Microstructure, Microstructures

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Novel family of thermogelling materials via C-C bonding between poly(acrylic acid) and poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide)

Article Abstract:

A study was conducted to analyze the copolymerization of 15 Pluronic poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) block copolymers with poly(acrylic acid) using a novel one-step synthetic process. The effective level of conversion of acrylic acid was obtained by measuring amounts of acrylic acid monomer during polymerization. Experimental results indicated exponential acceleration of branching and cross-linking in Pluronic poly(acrylic acid) copolymers during high degrees of acrylic acid conversion.

Analysis, Molecular dynamics, Ethylene oxide, Acrylic acid

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