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000034049 0247_ $$2DOI$$a10.1016/S0378-3812(03)00259-0
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000034049 084__ $$2WoS$$aThermodynamics
000034049 084__ $$2WoS$$aChemistry, Physical
000034049 084__ $$2WoS$$aEngineering, Chemical
000034049 1001_ $$0P:(DE-Juel1)VDB15622$$aMelnichenko, Y. B.$$b0$$uFZJ
000034049 245__ $$aUniversal behavior of polymers in blends, solutions, and supercritical mixtures and implications for the validity of the random phase approximation
000034049 260__ $$aNew York, NY [u.a.]$$bScience Direct$$c2003
000034049 300__ $$a209 - 219
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000034049 440_0 $$010762$$aFluid Phase Equilibria$$v212$$x0378-3812
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000034049 520__ $$aBlending (or mixing) of macromolecules is widely used to tailor the properties of polymeric materials and small-angle neutron scattering (SANS) has provided detailed information at the molecular level on the ability of different polymer species to mix or segregate at various thermodynamic conditions. For two decades, SANS data have been analyzed via the de Gennes "random phase approximation" (RPA) [P.-G. de Gennes, Scaling Concepts in Polymer Physics, second ed., Cornell University Press, Ithaca, London, 1979], which is based on the assumption that the dimensions of polymer chains remain unchanged on mixing for all concentrations and temperatures. Here we investigate the effect of temperature and concentration on the dimensions of macromolecules in blends using SANS and high-concentration labeling methods and construct a generic phase diagram, which specifies the range of validity of the RPA. Using scaling arguments, we demonstrate a parallel between the structure-property relationships in blends and solutions of polymers in small molecule solvents and reveal the impact of the chain length of the polymeric solvent on the phase behavior of polymer blends. The results offer new insights into the universality of the thermodynamic properties and structure of macromolecules in polymeric, liquid and supercritical solvents. (C) 2003 Elsevier B.V. All rights reserved.
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000034049 65320 $$2Author$$apolymer blends
000034049 65320 $$2Author$$aliquid-liquid equilibria
000034049 65320 $$2Author$$acritical state
000034049 65320 $$2Author$$asmall-angle neutron scattering
000034049 7001_ $$0P:(DE-Juel1)VDB4755$$aWignall, G. D.$$b1$$uFZJ
000034049 7001_ $$0P:(DE-Juel1)130962$$aSchwahn, D.$$b2$$uFZJ
000034049 773__ $$0PERI:(DE-600)1483573-3$$a10.1016/S0378-3812(03)00259-0$$gVol. 212, p. 209 - 219$$p209 - 219$$q212<209 - 219$$tFluid phase equilibria$$v212$$x0378-3812$$y2003
000034049 8567_ $$uhttp://dx.doi.org/10.1016/S0378-3812(03)00259-0
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000034049 9141_ $$aNachtrag$$y2003
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