High Pressure Phase Diagram of an Aqueous PEO-PPO-PEO Triblock Copolymer System via Probe Diffusion Measurements

Autor:	John H. van Zanten, Christopher J. Kloxin
Rok vydání:	2010
Předmět:	Microrheology Polymers and Plastics Rheometry Scattering Chemistry Organic Chemistry Thermodynamics Small-angle neutron scattering Light scattering Inorganic Chemistry Phase (matter) Polymer chemistry Materials Chemistry Soft matter Phase diagram
Zdroj:	Macromolecules. 43:2084-2087
ISSN:	1520-5835 0024-9297
DOI:	10.1021/ma902571h
Popis:	Phase diagrams of soft fragile materials are typically determined via static structural methods, such as small angle neutron scattering (SANS; Mortensen, K.; Pedersen, J. S. Macromolecules 1993, 26 (4), 805−812), small-angle X-ray scattering (Lodge, T. P.; Pudil, B.; Hanley, K. J. Macromolecules 2002, 35 (12), 4707−4717), or light scattering (Brown, W.; Schillen, K.; Almgren, M.; Hvidt, S.; Bahadur, P. J. Phys. Chem. 1991, 95 (4), 1850−1858). Dynamical methods, such as rheometry, can also be employed since the relaxation spectrum varies greatly from one phase to another. Unfortunately, mechanically disturbing these systems can alter the underlying fragile structures, precluding quiescent state determination. Here, a method for determining soft matter phase diagrams utilizing high-frequency tracer microrheology measurements is demonstrated for an aqueous PEO-PPO-PEO triblock copolymer system over a full range of temperatures and hydrostatic pressures. Since the tracer particle thermal motion reflects the u...
Databáze:	OpenAIRE
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