Miscibility

About: Miscibility is a research topic. Over the lifetime, 5521 publications have been published within this topic receiving 133547 citations. The topic is also known as: miscible.

Composition dependence of the miscibility and phase structure of amorphous/crystalline polymer blends as studied by high-resolution solid-state carbon-13 NMR spectroscopy

Abstract: Blends of poly(vinylphenol) (PVPh) with poly(ethylene oxide) (PEO) or poly(ethylene glycol) (PEG) blends are studied. The results indicate that an intermolecular hydrogen-bonding interaction causes the blends to be miscible. The miscibility and the phase structure of the blends show a significant compositional dependence. When PVPh is rich, the two polymers are miscible and form an amorphous phase homogeneous on the 20-30 A scale as well as the 200-300 A scale. The motion of PEO (PEG) in the miscible phase is restricted by PVPh. At a PEO (PEG) composition of about 50 wt%, the amorphous PEO (PEG) phase appears and coexists with the miscible phase

Structural and phase separation characterization of poly(lactic acid)/poly(ethylene oxide)/carbon nanotube nanocomposites by rheological examinations

Abstract: The morphology and phase separation have significant impacts on the properties and applications of polymer blends and nanocomposites. In this study, poly(lactic acid) (PLA)/poly(ethylene oxide) (PEO) blends and PLA/PEO/carbon nanotube (CNT) nanocomposites are prepared by solution mixing and the rheological approach is applied to study the morphology and phase separation of the prepared samples. Scanning electron microscopy (SEM) is also used to study the morphology and structure of samples. Additionally, the miscibility or immiscibility between polymer blends was analyzed through Han plots. The results display the lower critical solution temperature (LCST) phase diagram for the prepared samples demonstrating that the enhancement of temperature promotes phase separation. Moreover, the addition of nanoparticles transfers the LCST diagram to high temperatures. The deformation relaxation of PEO droplets commonly diminishes the modulus at very low frequencies, while the formation of big CNT networks in nanocomposites containing high CNT content results in a constant modulus. Han plots also represent the immiscibility in the samples containing 60 and 75 wt% PLA and the nanocomposites including 90 wt% PLA show homogenous structures. The SEM images verify the outputs of rheological tests conducted for the morphology of samples.