Study of compatibility assessments and of the phase state of polymer mixtures

Thermal degradation studies in poly(vinyl chloride)/poly(methyl methacrylate) blends

“…They observed multiphase structures through optical microscopy over the entire composition range. Two results from the literature are typical; Razinskaya et al [7] were unable to produce compatible blends of PMMA/PVC from tetrahydrofuran (THF) and, Walsh and McKeown [8] have reportedly produced compatible blends using methyl ethyl ketone (MEK) as a mutual solvent. Schmidt and Gardella [9] have also reported that PVC/PMMA blends cast from MEK have a higher degree of miscibility than the blends resulting from THF casting.…”

Miscibility of polymethacrylate/poly(vinyl chloride) blends

“…Several examples of the use of ( ), 7\p(H), and spin diffusion measurements to characterize polymer/polymer miscibility have been reported.5,18'20 By determining the T1 (H) values for a blend in comparison to the ^ ) vafues for the pure component polymers, it may be possible under certain circumstances to estimate an upper limit to the scale of heterogeneity present in the blend. If the scale of the phase separation in the blend is sufficiently small to permit rapid diffusion of proton spin energy such that a single-component relaxation process is observed, which is proportional to the weight fractions of the blend components, eq 2 may be used to estimate the upper limit to <L2> =* (t/T2)«o2> (2) the domain size,17,21 where l0 is the distance between protons, T2 is the proton spin/spin relaxation time, t is the spin diffusion time constant set equal to the observed (H) value, and <L2) is the mean square distance over which magnetization is transported. Our data do not provide direct measurement of spin diffusion coefficients but do provide for application of eq 2 to estimate the upper limit to heterogeneity in the blends.…”

Compatibilization of polyvinyl chloride ‐ polymethyl methacrylate polymer blends with maleic anhydride‐styrene‐methyl methacrylate terpolymer

“…With the literature search, it was observed that the PVC‐PMMA system at 50%–50% by mass was not miscible 14–17 . The solutions of the mixtures containing these half and half ratios and the same mixtures containing the compatibilizer were prepared using the experimentally determined THF solvent.…”

“…With the literature search, it was observed that the PVC-PMMA system at 50%-50% by mass was not miscible. [14][15][16][17] The solutions of the mixtures containing these half and half ratios and the same mixtures containing the compatibilizer were prepared using the experimentally determined THF solvent. For this; PVC/PMMA mixture solutions of equal mass at a concentration 0.25, 0.50, 0.60, 0.70, 0.80, and 1.0 g/dl and this binary system's solutions containing MA-St-MMA terpolymer 0%-2%-5%-10% by mass were prepared at the same concentrations.…”

“…Again, in the same Interface tension fluctuations in polymer systems result in phase separation. [15][16][17] It has been shown in many experimental studies that the interfacial tension fluctuations in polymer blends decrease with the effect of the compatibilizer used and reduce the interfacial tension fluctuations. Thus, phase separations are not observed.…”