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Author Wu, G. ♦ Chu, B. ♦ Schneider, D. K.
Sponsorship USDOE
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ CHEMISTRY ♦ COPOLYMERS ♦ SMALL ANGLE SCATTERING ♦ MICELLAR SYSTEMS ♦ EXPERIMENTAL DATA ♦ NUMERICAL DATA ♦ AQUEOUS SOLUTIONS ♦ XYLENES ♦ SOLUBILITY
Abstract Small-angle neutron scattering (SANS) was used to investigate the micellar structure formed by a poly(oxyethylene-oxypropylene-oxyethylene) (PEO{sub 13}PPO{sub 30}PEO{sub 13}, Pluronic L64) copolymer in D{sub 2}O over a temperature range of 8.4-35.0{degree}C. The intermicellar interactions were corrected by using an equivalent hard sphere approximation with an equivalent hard sphere radius. The aggregation number of the micelles decreased with decreasing temperature. The micellar scattering behavior could be well described by a core-shell structure. Based on the core-shell model, the volume fraction of the polymer segments in the micellar shell was less than 0.2. The micellar molar mass became larger after having introduced an organic solvent (xylene) into the system and increased with increasing amount of solubilized xylene. The maximum amount of solubilized xylene in the micelle was of the order of 0.3-0.4 xylene molecule per PO unit. 35 refs., 7 figs., 3 tabs.
ISSN 00223654
Educational Use Research
Learning Resource Type Article
Publisher Date 1995-04-06
Publisher Place United States
Journal Journal of Physical Chemistry
Volume Number 99
Issue Number 14


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