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SANS from P85/water-d under pressure.

Bryna Clover¹, Boualem Hammouda

¹Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA. bclover@umd.edu

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|December 17, 2009

Summary

This summary is machine-generated.

Hydrostatic pressure increases transition temperatures for Pluronic P85 copolymer solutions in water. Increasing pressure also affects the formation of new phases, specifically demixed lamellae.

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Area of Science:

Polymer Science
Materials Science
Physical Chemistry

Background:

Pluronics are amphiphilic triblock copolymers with poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) structure.
Pluronic P85 exhibits complex phase behavior in aqueous solutions, transitioning from unimers to various micelle structures (spherical, cylindrical, lamellar) with increasing temperature.

Purpose of the Study:

To investigate the influence of hydrostatic pressure on the phase boundaries of Pluronic P85 aqueous solutions.
To characterize pressure-induced changes in micelle formation and phase transitions.

Main Methods:

Small-angle neutron scattering (SANS) was employed to study a dilute solution of Pluronic P85 in deuterated water.
The study systematically varied temperature and hydrostatic pressure.

Main Results:

Transition temperatures for all observed micelle phases (spherical, cylindrical, lamellar) increase with rising hydrostatic pressure.
A novel phase of demixed lamellae was identified at elevated temperatures.
Hydrostatic pressure was found to decrease the onset temperature for the formation of this new demixed lamellar phase.

Conclusions:

Hydrostatic pressure significantly alters the phase behavior of Pluronic P85 in water.
The findings provide critical insights into the pressure-dependent self-assembly of block copolymers.