SANS from Pluronic P85 in d-water

Published

December 1, 2010

Author(s)

Boualem Hammouda

Abstract

Small-angle neutron scattering (SANS) has been used to investigate pluronic P85 (EO₂₆PO₄₀EO₂₆) copolymer in deuterated water. A range of P85 fractions were measured for a wide sample temperature window. A rich phase behavior is reported. Unimers were observed below the critical micelle formation condition. At fixed P85 fraction, a number of micellar phases were observed upon increasing temperature; first spherical micelles, then cylindrical micelles, then lamellar micelles. At the highest temperatures, a demixed lamellae phase was observed. Analysis of the SANS data consisted in fits to an empirical Guinier-Porod model that was appropriate for data fitting in the various phases at low P85 fractions. When the P85 fraction increased, an inter-particle structure factor was included to analyze SANS data from concentrated spherical micelles. At high P85 fractions, paracrystalline structures were observed as evidenced by an enhanced interparticle interaction peak. A phase diagram for P85/d-water was obtained showing the various phases.

Citation

European Polymer Journal

Volume

46

Pub Type

Journals

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Citation

Hammouda, B. (2010), SANS from Pluronic P85 in d-water, European Polymer Journal, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=904126 (Accessed October 31, 2024)