Results 211 to 220 of about 26,926 (263)
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Effect of pharmaceuticals on thermoreversible gelation of PEO–PPO–PEO copolymers
Colloids and Surfaces B: Biointerfaces, 2008Pluronic F127, a triblock copolymer of poly(ethylene oxide) (PEO) and poly(propylene oxide) (PPO), has generated considerable interest as a drug delivery vehicle due to its ability to gel at physiological temperatures. This work examines the gelation behavior of Pluronic F127 in the presence of a series of hydrophobic pharmaceuticals, to determine ...
Sharma, PK +5 more
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The effect of pharmaceuticals on the nanoscale structure of PEO–PPO–PEO micelles
Colloids and Surfaces B: Biointerfaces, 2008We present results on the effects of various hydrophobic drugs and additives on the micellar structure of Pluronic F127 solutions. Small-angle neutron scattering experiments on 5wt% F127 solutions were used to measure micelle core size (R(1)), micelle corona size (R(2)), intermicellar interaction distance (R(int)), polydispersity (sigma), and ...
Sharma, PK +4 more
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Nanostructure of PEO–polyurethane–PEO triblock copolymer micelles in water
Journal of Colloid and Interface Science, 2010Novel hydrophilic triblock copolymers which form micelles in aqueous solution were studied by static and dynamic light scattering (SLS and DLS), small angle neutron scattering (SANS) and densitometry. The polymers were symmetric A-B-A block copolymers having two poly(ethylene oxide) (PEO) tail blocks and a polyurethane (PU) center segment that ...
Caba, BL +7 more
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Emulsions stabilized with PEO–PPO–PEO block copolymers and silica
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2002The specific behavior of poly(ethylene oxide)–poly(propylene oxide)–poly(ethylene oxide) (PEO–PPO–PEO) tri-block copolymers in aqueous solutions was studied in the presence of vinyl acetate (VAc) and colloidal silica. Several factors controlling specific interactions were investigated, the block copolymer molecular weight and hydrophilic/hydrophobic ...
Uricanu, V.I., Gosa, Kristiana-Lisette
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Perspectives on: PEO-PPO-PEO Triblock Copolymers and their Biomedical Applications
Journal of Bioactive and Compatible Polymers, 2006Thermo-reversible polymeric gels represent an interesting class of materials that can be tailored for a wide range of applications. The triblock poly(ethylene oxide) (PEO) and poly(propylene oxide) (PPO) based systems, PEO-PPO-PEO, show thermoreversible gelation around body temperature and, therefore, are particularly suitable for biomedical ...
Fusco S, Borzacchiello A, Netti PA
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Industrial & Engineering Chemistry Research, 2014
The rheological properties of partially hydrolyzed polyacrylamide (HPAM) and PEO-PPO-ph-PPO-PEO (BPE) or PPO-PEO-ph-PEO-PPO (BEP) block polyether solutions are investigated here. Another hydrophobically associating polymer (HMPAM) is chosen as a contrast.
Houjian Gong +4 more
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The rheological properties of partially hydrolyzed polyacrylamide (HPAM) and PEO-PPO-ph-PPO-PEO (BPE) or PPO-PEO-ph-PEO-PPO (BEP) block polyether solutions are investigated here. Another hydrophobically associating polymer (HMPAM) is chosen as a contrast.
Houjian Gong +4 more
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Journal of Colloid and Interface Science, 1996
The solubilization of hydrocarbons by micelles formed of diblock and symmetric triblock copolymers in water are compared in the framework of a mean-field theory of solubilization. The block copolymers contain poly(ethylene oxide) as the hydrophilic block and poly(propylene oxide) as the hydrophobic block and are designated as EXPYEX or EWPZ (where E ...
, Nagarajan, , Ganesh
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The solubilization of hydrocarbons by micelles formed of diblock and symmetric triblock copolymers in water are compared in the framework of a mean-field theory of solubilization. The block copolymers contain poly(ethylene oxide) as the hydrophilic block and poly(propylene oxide) as the hydrophobic block and are designated as EXPYEX or EWPZ (where E ...
, Nagarajan, , Ganesh
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Crystalline Structure of PEO−Resorcinol and PEO−Methylresorcinol Complexes
Macromolecules, 1999The molecular structure of the polyethylene oxide (PEO) molecular complexes with resorcinol (RES) and 2-methylresorcinol (two allotropic forms α-2MR and β-2MR) have been solved and refined by an X-ray diffraction technique (the “whole-pattern method”). The space group is Pna21 for RES (a = 10.54 A, b = 10.18 A, c = 9.89 A), Pbca for β-2MR (a = 11.07 A,
IANNELLI, Pio +3 more
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Polymer-induced crystallization of inorganic salts II. PEO-CaCl2, PEO-K2CO3 and PEO-CaCO3
Journal of Crystal Growth, 1993Abstract Structure, growth and morphology of various inorganic salts (CaCl2, K2CO3 and CaCO3) was investigated when crystallized in a polyethylene oxide (PEO) matrix. The PEO has profound influence on the crystalline phase and morphology of these salts which crystallize out when added in excess of 2:1 molar ratio.
S. Radhakrishnan, D.R. Saini
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Adsorption of PEO-PPO-PEO block copolymers at silica
Macromolecules, 1992It is found that block PEO-PPO-PEO copolymers adsorb at silica in much the same way as a PEO homopolymer of a comparable molecular weight, independent of the PO content in the range of 0-30%. The pH dependence is similar to that displayed by PEO. Good agreement is found between the ellipsometry experiments and the experiments on colloidal silica ...
Cosgrove, T, Malmsten, M, Linse, P
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