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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 article, the authors investigated thermodynamic properties related to the miscibility of saturated hydrocarbon polymers by simulation methods, and the effects of chain microstructure and chain length were examined.
Abstract: Thermodynamic properties related to the miscibility of saturated hydrocarbon polymers were investigated by simulation methods. Cohesive energy density, ΠCED, widely used to estimate the mutual solubilities of ordinary liquids, cannot be measured for polymers, but values of ΠCED have been inferred from data on internal pressure, ΠIP. Both ΠCED and ΠIP were obtained in this work by molecular dynamics simulations with a united atom model. The effects of chain microstructure and chain length were examined. The simulation model was tested with data for various heptane isomers (the C7 series), for which ΠCED and ΠIP are known. It was then applied to oligomers of various polymer species (the C30 series) with known ΠIP. Simulation values of ΠCED and ΠIP were also extrapolated to their long-chain limits in selected cases. The values and trends with structure were generally consistent with the experimental data available for the C7 and polymeric liquids. The ratio a = ΠCED/ΠIP was found to decrease from near unity ...

56 citations

Journal ArticleDOI
TL;DR: In this article, the steady and dynamic properties of a thermotropic liquid crystalline polymer (TLCP), HIQ45, its blend with a polycarbonate (PC) and with another TLCP (Vectra A950) are presented.
Abstract: Steady and dynamic rheological properties of a thermotropic liquid crystalline polymer (TLCP), HIQ45, its blend with a polycarbonate (PC) and with another TLCP (Vectra A950) are presented in this work. Due to the biphasic nature of HIQ45, both complex and steady shear viscosities increase with temperature after 350°C. According to a three-zone model, the dynamic rheological behaviour of HIQ45 is assigned to terminal and plateau zones. Relaxation times derived from the crossover frequencies of G′ and G″ decrease with temperature and show a sharp reduction between 320°C and 340°C. Dynamic rheology of PC shows terminal zone characteristics, and its blends with HIQ45 display PC-dominant dynamic behaviour. These blends were found to be miscible, which is unusual for blends of a TLCP and a thermoplastic. The Cox-Merz rule is followed by PC and HIQ45, but not by the blends. HIQ45 and Vectra A950 form a miscible blend system and its dynamic behaviour, both in the solid state and molten state, is dominated by HIQ45 component. The Cox-Merz rule is not obeyed by Vectra A950 but is for blends with HIQ45. Under steady shear, the blends show a strong negative deviation from the existing models proposed for miscible and immiscible blends. This enhanced synergistic flow behaviour is explained in terms of enhanced alignment and lubrication of the TLCPs on a molecular level.

56 citations

Journal ArticleDOI
D.J. David1, T.F. Sincock1
01 Jan 1992-Polymer
TL;DR: In this article, a new concept is presented based upon the utilization of the individual component contributions to the solubility parameter, which describes the interaction of polymer repeat units, provides semi-quantitative values which relate the three basic interactive forces, i.e. dispersive, polar and hydrogen bonding.

56 citations

Journal ArticleDOI
TL;DR: In this paper, a fullerene (C 60 )-end-capped poly(ethylene oxide) (FPEO) has been prepared by the cycloaddition reaction of monoazido-terminated poly(methylene oxide), with C 60.
Abstract: A fullerene (C 60 )-end-capped poly(ethylene oxide) (FPEO) has been prepared by the cycloaddition reaction of monoazido-terminated poly(ethylene oxide) with C 60 . The majority of the FPEO sample is the mono-adduct as shown by thermogravimetry and X-ray photo-electron spectroscopy. Most electronic characteristics of C 60 are retained in the polymer as shown by its UV-visible absorption spectrum. The incorporation of C 60 reduces the extent of crystallinity of PEO by 17%. The miscibility behavior of FPEO with poly(p-vinylphenol) (PVPh) was studied. Similar to PEO, FPEO is miscible with PVPh over the entire composition range. The hydrogen-bonding interaction between FPEO and PVPh is a strong as that between PEO and PVPh as shown by Fourier-transform infrared spectroscopy.

56 citations


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