Compatibility Studies of Pairs of Polymers by Viscometric Measurements on Ternary Solutions of the Two Polymers

Abstract

Dilute solution viscometry results at 30.08C are reported for three ternary solvent(1)/ polymer(2)/polymer(3) systems involving tetrahydrofuran (THF), polystyrene (PS), polybutadiene (PBD), poly(dimethylsiloxane) (PDMS), and poly(vinyl chloride) (PVC), specifically for the systems THF/PS/PBD, THF/PDMS/PVC, and THF/ PVC/PS. Interaction parameters determined for both these ternary systems and binary solvent-polymer combinations were used to estimate degrees of compatibility. A number of criteria were applied and the results analyzed and compared. Compatibility was found for the THF/PS/PBD and THF/PDMS/PVC systems, but incompatibility for THF/PVC/PS system, results which should help clarify compatibilities of the corresponding polymer pairs in blends.

Thermodynamic study of a water–dimethylformamide–polyacrylonitrile ternary system

“…When the polymer concentration is low in a ternary system, its phase diagram can be constructed with the method of cloud‐point titration 1–11. At high polymer concentration, however, the interaction between macromolecules is so strong that the polymer solution shows signs of crystallization or becomes gel‐like 2–5.…”

Effect of solvent on the compatibility of polyvinyl alcohol and polymethylmethacrylate by dilute solution viscometry method

“…Katime et al [24] proposed that the positive values of b m indicate miscibility between component polymers and vice versa, while, Shan feng et al [25] shows that a blend system having pos itive values of b m does not guarantee its miscibility. In our previous work and other related work, miscible blends with negative values of b m are also known [17,[24][25][26][27][28]. The sign of b m is, therefore, not reliable parameter for the characterization of polymer poly mer miscibility.…”

“…Many criteria have been proposed by researchers to determine polymer polymer miscibility 1 The article is published in the original. by the dilute solution viscometry method, such as intrinsic viscosity composition plots, reduced specific viscosity composition (Δ[b] m , Δ[η] m ), interaction parameter, μ, thermodynamic parameter, α, and modified thermodynamic parameter β [8,9,[13][14][15]. Analysis of the viscosity data with all the proposed cri teria brings for the fact that not all the criteria may simultaneously satisfy the condition for miscibility.…”