Statistical thermodynamics evaluation of polymer-polymer miscibility

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Journal titleJournal of Polymer Science Part B: Polymer Physics
SubjectCohesive energy; solubility parameter; lattice models; statistical thermodynamics; theory (Simha-Somcynsky); free volume; equation of state; corresponding states; miscibility (polymer-polymer)
AbstractThe Simha and Somcynsky (S–S) statistical thermodynamics theory was used to compute the solubility parameters as a function of temperature and pressure [δ = δ(T, P)], for a series of polymer melts. The characteristic scaling parameters required for this task, P*, T*, and V*, were extracted from the pressure–temperature–volume (PVT) data. To determine the potential polymer–polymer miscibility, the dependence of δ versus T (at ambient pressure) was computed for 17 polymers. Close proximity of the δ versus T curves for four miscible polymer pairs: PPE/PS, PS/PVME, and PC/PMMA signaled the usefulness of this approach. It is noteworthy, that the tabulated solubility parameters (derived from the solution data under ambient conditions) propounded the immiscibility of the PVC/PVAc pair. The computed values of δ also suggested miscibility for polymer pairs of unknown miscibility, namely PPE/PVC, PPE/PVAc, and PET/PSF. In recognizing the limitations of the solubility parameter approach (the omission of several thermodynamic contributions), these preliminary results are auspicious because they indicate a new route for estimating the miscibility of any polymeric material at a given temperature and pressure.
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AffiliationNRC Industrial Materials Institute; National Research Council Canada
Peer reviewedNo
NRC number54234
NPARC number18335936
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Record identifier644e42e9-acd8-4590-9373-afc78a27c0b8
Record created2011-07-29
Record modified2016-05-09
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