Liquid–liquid equilibria in polystyrene solutions: the general pressure dependence

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Publication Date
DOI 10.1039/A902824B
Impact Factor 3.676
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Abstract

In spite of numerous studies on liquid–liquid (LL) solubility in weakly interacting polymer solutions (such as polystyrene/methylcyclohexane), as yet there has been no general description of the pressure dependence of LL loci. Most likely this is a consequence of the diversity of shapes experimentally observed for LL loci under pressure. In this paper we present phase equilibrium measurements of LL precipitation from binary weakly interacting polystyrene/solvent systems which confirm the existence of a LL ‘master-curve’ which may be used to describe LL equilibria for Type III, IV and V systems in the Scott–Konynenburg formalism. More particularly, in Type III the entire demixing curve is located in the stable liquid region, in Type IV some part is located at negative pressure, and in Type V some part is located in the supercooled region. Secondly, we present a transformation which describes the LL diagrams (asymmetric in (T,P) space) using a symmetric scaling equation in reduced space.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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