Journal
POLYMER
Volume 53, Issue 2, Pages 536-545Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2011.11.045
Keywords
Star PS; UCST and LCST; Liquid-liquid phase separation
Categories
Funding
- National Science Foundation [NSF-DMR 0804593, 1104658]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1104658] Funding Source: National Science Foundation
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We introduce a model for polymer solutions and blends that display both an upper and a lower critical solution temperature (UCST, LCST). Using our simple analytic lattice theory along with a fixed parameter set independent of both composition and temperature, we study solutions and blends exhibiting complicated miscibility patterns, including cases in which a UCST is below an LCST, or above. With respect to the former, we examine the conditions under which a so-called hourglass phase diagram may evolve. Where possible we compare directly with experiment, however, we also explore the behaviour of a number of hypothetical solutions and blends. One experimental solution of particular interest comprises star polystyrene (PS) and cyclohexane: in this case we supply what we believe are the only measured pressure-volume-temperature data for a high molecular weight (5.2 x 10(5) g/mol) star PS. (C) 2011 Elsevier Ltd. All rights reserved.
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