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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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Journal ArticleDOI
TL;DR: In this paper, the miscibility of poly(methyl methacrylate) (PMMA) with bisphenol chloral polycarbonate (BCPC) has been studied using differential scanning calorimetry (DSC), optical indication of phase separation on heating (i.e., lower critical solution temperature (LCST) behavior), density measurement, and gas permeation.
Abstract: The miscibility of poly(methyl methacrylate) (PMMA) with bisphenol chloral polycarbonate (BCPC) has been studied using differential scanning calorimetry (DSC), optical indication of phase separation on heating (ie, lower critical solution temperature (LCST) behavior), density measurement, and gas permeation All evidence indicates that PMMA is miscible with BCPC over the whole blend composition range Single composition-dependent glass transition temperature and LCST behavior have been observed for each blend The specific volumes of the blends follow closely the simple additivity rule indicating the interaction between PMMA and BCPC is weak Gas permeability coefficients for He, H2, O2, Ar, N2, CH4, and CO2 measured at 35°C under 1 to 2 atm upstream pressure are lower than those calculated from the semilogarithmic additivity rule The difference between this calculated permeability and the measured one increases with gas molecular size As a result, the ideal gas separation factors for He/CH4, CO2/CH4, and O2/N2 gas pairs estimated from the ratio of pure gas permeabilities are higher than predicted from the semilogarithmic additivity rule These permeation results were interpreted in terms of the free volume theory and the activated state theory, which have been proposed to describe gas transport behavior in polymer mixtures

39 citations

Journal ArticleDOI
TL;DR: In this paper, a VC/PVAc polymer blend with different mass fraction concentration was prepared using traditional solvent casting technique using Fourier transform infrared FTIR used to identify various vibrational groups presented in associated with structural changes.
Abstract: PVC\PVAc polymer blend with different mass fraction concentration were prepared using traditional solvent casting technique. Fourier transform infrared FTIR used to identify various vibrational groups presented in associated with structural changes. X-ray diffraction data approve the amorphous nature of all samples despite their concentration while optical (UV\vis) spectra confirm the complexation behavior of blend system and their miscibility. Optical energy gap and Urbach energy were calculated for further data interpretation. The obtained energy gap data determine the direct transition which suggests that a prepared blend is a conductive material. However, Urbach energy shows no crystal lattice disorder change that ensures X-ray results. The Scanning electron microscope (SEM) reveals the smooth and homogenous nature of the surface morphology for all proportions. Prepared films showed good antibacterial characteristics against gram-positive pathogenic grams in contrast with gram-negative, fungal, and yeast.

39 citations

Journal ArticleDOI
01 Apr 1984-Polymer
TL;DR: In this article, the in situ polymerization of vinyl chloride with various polyacrylates and polymethacryls has been studied by dynamic mechanical analysis and the results correlated well with previously measured interaction parameters.

39 citations

Journal ArticleDOI
TL;DR: In this paper, the authors used Fourier transform infrared and 1H nuclear magnetic resonance spectroscopy to determine the extent of grafting of DMAEMA to linear low-density polyethylene in the melt, and the effects of initiator type, feed composition and reaction time and temperature were studied.
Abstract: The production of a polymer containing basic functional groups via the reactive processing of polyethylene was investigated. Grafting of dimethylamino ethyl methacrylate, DMAEMA, to linear low-density polyethylene in the melt was carried out, and the effects of initiator type, feed composition, and reaction time and temperature were studied. The extent of grafting was determined by Fourier transform infrared and 1H nuclear magnetic resonance spectroscopy, and the degree of cross-linking was observed by measuring the products' melt indices. Thermal stability of the product was investigated using differential scanning calorimetry. Materials containing up to 3 wt% of grafted DMAEMA were prepared. The choice of appropriate feed compositions and reaction conditions allows the production of a material containing the maximum amount of grafted DMAEMA, while minimizing cross-linking. The grafted polyethylene produced under these conditions is more stable than the starting material, suggesting an antioxidant effect of the grafted moieties. The functional polymer produced should be of interest for the preparation of polymer blends with acidic polymers by virtue of the miscibility enhancement that could occur as compared with the hydrocarbon precursor.

39 citations

Journal ArticleDOI
TL;DR: In this paper, the phase diagram of the PES-C/PEO blends was established from both the thermal analysis and optical microscopy, and the phase separation process in the blends has also been investigated by using DSC.
Abstract: The miscibility of blends of phenolphthalein poly(ether ether sulfone) (PES-C) and poly(ethylene oxide) (PEO) was established on the basis of the thermal analysis results. Differential scanning calorimetry (DSC) studies showed that the PES- C/PEO blends prepared by casting from N,N-dimethylformamide (DMF) possessed a single, composition-dependent glass transition temperature (Tg), and thus that PES- C and PEO are miscible in the amorphous state at all compositions at lower tempera- ture. At higher temperature, the blends underwent phase separation, and the PES-C/ PEO blend system was found to display a lower critical solution temperature (LCST) behavior. The phase separation process in the blends has also been investigated by using DSC. Annealed at high temperatures, the PES-C/PEO blends exhibited signifi- cant changes of thermal properties, such as the enthalpy of crystallization and fusion, temperatures of crystallization and melting, depending on blend composition when phase separation occurred. These changes reflect different characteristics of phase structure in the blends, and were taken as probes to determine phase boundary. From both the thermal analysis and optical microscopy, the phase diagram of the blend system was established. q 1997 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 35: 1383- 1392, 1997

39 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023215
2022427
2021114
2020130
2019114
2018114