Miscible polymer blends: 1. Thermodynamics of the blend melts poly(methyl methacrylate)-poly(ethylene oxide) and poly(methyl methacrylate)-poly(vinylidene fluoride)

Morphology and spherulitic growth kinetics in poly(ethylene oxide)/poly(n‐butyl methacrylate) blends

“…The structure of the blends consists of crystalline PEO lamellae and an amorphous mixture, in which a part of the PEO molecules is mixed with PnBMA. Similar behaviour has been reported for PEO/PMMA blends with high‐molecular‐weight components 23, 24…”

Ionic conductivity and electrochemical stability of poly(methylmethacrylate)–poly(ethylene oxide) blend-ceramic fillers composites

“…One of the problems commonly faced during blending of polymers is the miscibility of the components. Blends of PEO and poly(methylmethacrylate) (PMMA) are one among the few types of blends that are considered to be miscible on a molecular level in the melt [4]. The overall kinetic rate of crystallization in PEO strongly decreases by increasing the concentration of PMMA in the blends [5], which would lead to an improvement in ionic conductivity of the electrolyte films.…”

Phase Behavior of Poly(methyl methacrylate)/Poly(vinylidene fluoride) Blends in the Presence of High‐Pressure Carbon Dioxide

“…[16,33] With the existence of microscopic PVDF-rich features in the present blends notwithstanding, analysis of the SAXS patterns corresponding to the 88/12 and 69/31 PMMA/ PVDF blends prior to CO 2 exposure yields values of w that are not only numerically similar (À0.131 and À0.118, respectively), but also in good quantitative agreement with previously reported results gleaned from several different analytical techniques. [13,[25][26][27][28][29][30][31] The RPA can be used to extrapolate values of the scattering intensity at q ¼ 0 nm À1 , hereafter denoted I(0), as well as yield discrete values of w, from each scattering pattern acquired. This parameter, which cannot be measured directly from the data because of the upturn at low q, provides an alternate measure of molecular compatibility, increasing in magnitude with increasing incompatibility.…”

“…[24] Efforts designed to elucidate and predict the phase behavior of PMMA/PVDF blends have sought to measure the Flory-Huggins interaction parameter (w) by various analytical methods including melting point depression, [13,25,26] small-angle X-ray and neutron scattering, [27,28] inverse chromatography, [29,30] and dilatometry. [31] Measured values of w typically vary between À0.03 and À0.7. Variation in the value of w reflects differences in molecular weight, PMMA tacticity, PVDF head-to-head or tail-to-tail defects, temperature, and the method of measurement.…”

“…Another intriguing attribute of these blends is that there is growing evidence to indicate that they may likewise exhibit an upper critical solution temperature (UCST), which is difficult to measure because of reduced chain mobility at the low temperatures near the purported UCST. [16,[31][32][33][34] One established route by which to modify the properties of PMMA and PVDF individually is through exposure to high-pressure CO 2 , which can effect substantial reductions in the melt viscosities of both polymers. [35] Interest in developing general procedures that use CO 2 as an aid for various polymerizations and polymer processes continues to gain momentum.…”