Equation-of-state theory applied to mixtures of isotactic poly(ethyl methacrylate) and poly(vinylidene fluoride)

Abstract

Macromoleculesrange of dielectric constants (3.5-35) used here. Since the calculated quantities show the same qualitative trends throughout this range of dielectric constants, we would expect our conclusions to hold when a more sophisticated electrostatic potential is employed.Added in Proof If bolaform electrolytes were studied a t a temperature different from the 0 temperature for polymethylene, an additional perturbation would arise from the excluded-volume effect. Since the interaction of the charged chain ends becomes negligible as n becomes infinite, the expansion arising from the excluded-volume effect would dominate for large bolaform electrolytes. Acknowledgment.ABSTRACT: Flory's equation-of-state theory is applied to a PVF2/it-PEMA system with a lower critical solution temperature. A comparison is made between the observed irregular asymmetric cloud point curve and the calculated spinodals. The agreement is good for values of the mixing parameters, which are in accordance with melting point depression data.ABSTRACT: A review of the preparation and structure/property relationships of various polyquinolines is preaented. The monomer and polymer syntheses and the kinetics, solution properties, morphology, thermal analyses, and cross-linking reactions of polyquinolines are discussed.

A Study of Temperature Dependence of Thermodynamic Interactions in Polymer Solutions of Infinite Dilution by Equation-of-State Theory

“…5 In this connection, it is crucial to know the drift of the specific volume, thermal expansion coefficient and thermal pressure coefficient of each component, and the ratio Si/S2 with temperature. As such, we have collected from the reliable sources the required information for polystyrene (PS), 8 polyisobutylene (PIB), 9 and various solvents including toluene, 10 cyclohexane, 11 · 12 and benzene.…”

“…Here, µ~ is related to the concentration of the solution via the contact site fraction of polymer segment (3) and the reduced temperature of the solution t <P1PfT1 +</J2Pff2 (4) where </J; is the segment fraction of component i defined in terms of the hard-core volumes of the pure components, and S 1 /S 2 is the ratio of the surface area of a solvent molecule and that of a polymer segment having the same hard-core volume as the solvent molecule. Accordingly, the two distinct volume fractions cited above are correlated by V2/iJ2 (5) where V 1 = I -V 2…”

Thermodynamic study on phase equilibrium of epoxy resin/thermoplastic blends

“…This approach admits both positive and negative mixing enthalpies and is able to predict both LCST and UCST behaviour. The Flory equation of state theory has been applied often to solve LCST systems [34][35][36]. In these papers, mixing enthalpies, chemical potentials, binodal, spinodal, and critical point conditions are evaluated as functions of critical and reduced quantities, specific volumes and thermal expansion and thermal pressure coefficients, as well as relationships between contact surfaces (surface per unit of core volume ratio) and the interaction term X 12 and the interaction entropy parameter Q 12 .…”

Enthalpy and Volume Relaxation of Core‐Crosslinked Star Polystyrene/Poly(methyl methacrylate) Blends

“…The reduced volume within linear/CCS polymer blends results in molecules being closer together than in a pure linear system, leading to a reduction in the degrees of freedom. [9,10] This reduction in degrees of freedom results in restricted segmental motions. Molecular motion can additionally be hindered by the increased matrix viscosity which star polymers are known to cause, commonly referred to as the viscosity effect.…”