Dilute and semi dilute solutions of block copolymers in water, near-critical and super-critical CO2: a small angle scattering study of the monomer–aggregate transition

F. Triolo, A. Triolo, F. Lo Celso, D.I. Donato and R. Triolo

Physica A: Statistical Mechanics and its Applications, 2002, vol. 304, issue 1, 135-144

Abstract: Small angle neutron (SANS) and X-ray (SAXS) Scattering measurements on aggregate formation of block copolymers in water and in near-critical and supercritical CO2 are reported here. Time Resolved SAXS (TR-SAXS) has also been performed in the supercritical region. Experiments have been carried out for a series of different thermodynamic conditions, changing the solvent density by profiling the pressure at constant temperature. A sharp transition between monomers dissolved as random coils and micelles characterized by a solvo-philic shell and a solvo-phobic core occurs when the solvent density reaches the critical micellization value. This is easily shown in the case of scCO2.

Keywords: Critical micellization density; Supercritical fluids; Time resolved small angle X-ray scattering; Monomer–aggregate transition; Block copolymers (search for similar items in EconPapers)
Date: 2002
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:304:y:2002:i:1:p:135-144

DOI: 10.1016/S0378-4371(01)00529-5

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