Topic
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.
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TL;DR: In this article, the compatibility of polystyrene/poly (4-vinylpyridine) has been studied by using dilute solution viscometry (DSV), differential scanning calorimetery (DSC), Fourier transformation-infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM).
Abstract: Blends of polystyrene/poly (4-vinylpyridine) have been prepared by casting from a common solvent. The compatibility of the blends was studied by using dilute solution viscometry (DSV), differential scanning calorimetery (DSC), Fourier transformation-infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM). The relative viscosity versus composition plots for the blends are not perfect linear. The corresponding intrinsic viscosity values show negative deviation from ideal behavior when plotted against composition. Also, the modified Krigbaum and Wall interaction parameter, Δb, shows small and negative values for all compositions except for the blend PS/P4VP (25 : 75). The results indicate that the polymers are incompatible but small interaction values predict physically miscible blends which eventually show phase separation, as is observed in the present studies. However, the blends as obtained show a single, composition-dependent, glass transition temperature that fits the Fox equation well, indicating the presence of homogeneous phase. The constant, k obtained from Gordon-Taylor equation suggests intermolecular attraction between these polymers. FT-IR and SEM support the results of DSV and DSC. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
41 citations
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TL;DR: In this article, the mixture of poly(3-hydroxybutyrate) and poly(propylene carbonate) (PPC), biodegradable polyester, and pure sample films were prepared with the ratio of PHB/PPC ranging from 90/10 to 10/90 by codissolving these two polyesters in chloroform and casting the mixture.
Abstract: Nine blends of poly(3-hydroxybutyrate) (PHB) and poly(propylene carbonate) (PPC), biodegradable polyester, and pure sample films were prepared with the ratio of PHB/PPC ranging from 90/10 to 10/90 by codissolving these two polyesters in chloroform and casting the mixture. The miscibility, crystallization, melting behavior, morphology, and mechanical properties of the blends have been studied by differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), wide angle X-ray diffraction (WAXD), polarizing optical microscopy (POM), and scanning electron micrograph (SEM). The results indicated that PHB showed complete miscibility with PPC for PHB/PPC 30/70, 20/80, and 10/90, as evidenced by the only one composition-dependent glass transitions (Tg) of blends, and the Tgs close to the values calculated using the Fox equation. However, PHB showed immiscibility with PPC for the other six blends, as shown by the existence of almost unchanged Tg of PHB at about 2°C. According to the DSC analysis, the crystallization of PHB was suppressed by blending with abundant PPC. This result is consistent with results obtained from X-ray and POM results. Some interaction between the two macromolecules was confirmed by using FTIR analysis. SEM graphs showed that the blends containing PHB ≤ 30 wt % tend to form a more compact structure, and no obvious phase separation was found. The brittleness of PHB was improved apparently by blending with PPC. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
41 citations
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TL;DR: In this article, the mechanical and dynamic properties of poly(ethylene-co-acrylic acid) (PEA) and epoxidized natural rubber (ENR-50) have been studied after reactive blending in various proportions in a Brabender Plastic Order.
41 citations
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TL;DR: Analysis and spectral deconvolution revealed composition and miscibility dependent variations in the strength of drug-polymer intermolecular H-bonding and solution state interactions data such as PVP globular size distribution and solution infrared spectral profiles showed substantial processing method dependence.
Abstract: In this work, we investigated the relationship between various intermolecular hydrogen-bonding (H-bonding) interactions and the miscibility of the model hydrophobic drug naproxen with the hydrophilic polymer polyvinylpyrrolidone (PVP) across an entire composition range of solid dispersions prepared by quasi-equilibrium film casting and nonequilibrium melt quench cooling. The binary phase behavior in solid dispersions exhibited substantial processing method dependence. The solid state solubility of crystalline naproxen in PVP to form amorphous solid dispersions was 35% and 70% w/w naproxen in solution-cast films and quench-cooled films, respectively. However, the presence of a single mixed phase glass transition indicated the amorphous miscibility to be 20% w/w naproxen for the films, beyond which amorphous–amorphous and/or crystalline phase separations were apparent. This was further supported by the solution state interactions data such as PVP globular size distribution and solution infrared spectral pro...
41 citations
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TL;DR: In this paper, phase separation of two partially miscible polymer blends with modulated temperature DSC (MTDSC) is studied with optical microscopy, and the lower critical solution temperature (LCST) demixing behavior of poly(ethylene oxide) (PEO) blended with poly(ether sulphone) and with poly (3,4 0 diphenylene ether isophtaloyl amide) is in excellent agreement with results obtained from non-isothermal MTDSC measurements.
41 citations