Journal ArticleDOI
Upper and lower critical solution temperatures in the cosolvent system acetone(1)+ diethyl ether(2)+ polystyrene(3)
John M. G. Cowie,Iain J. McEwen +1 more
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TLDR
In this paper, phase diagrams for different molecular weight fractions of polystyrene in the mixed solvent system acetone + diethyl ether have been obtained, showing a variation of upper and lower critical solution temperatures with solvent composition.Abstract:
Phase diagrams for different molecular weight fractions of polystyrene in the mixed solvent system acetone + diethyl ether have been obtained. The system shows a variation of upper and lower critical solution temperatures with solvent composition which indicates the cosolvent nature of the mixed solvent. No solvent composition is found which can dissolve high molecular weight poly-styrene (M106). The separation of critical solution temperatures can be predicted by the Prigogine theory of polymer solution thermodynamics, but not the absolute values.read more
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Phase Behavior of Polymers in Supercritical Fluid Solvents.
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Comparison of MIBK/IPA and water/IPA as PMMA developers for electron beam nanolithography
TL;DR: In this article, an ultrasonically assisted development was used to improve resolution and line edge roughness in PMMA resist with 3:7 water/IPA developer, and the results showed improvements in sensitivity (∼40%), contrast, exposure dose latitude, roughness and resolution.
Journal ArticleDOI
Alcohol-water cosolvent systems for poly(methyl methacrylate)
TL;DR: In this paper, a mixture of water and alcohols, containing up to 0.4 volume fraction water, have been found to dissolve poly(methyl methacrylate) and phase boundaries have been established and these indicate significant cosolvent action.
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Phase behavior and modeling of the poly(methyl methacrylate)–CO2–methyl methacrylate system
Michele Lora,Mark A. McHugh +1 more
TL;DR: In this article, the SAFT equations of state were used to model the mixture-critical region of PMMA and CO2-methyl methacrylate (MMA) data.
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Two-dimensional liquid chromatography of synthetic polymers
TL;DR: The benefits of 2D-LC are demonstrated together with numerous problems and shortcomings of the method, and the principles, reasons, and significance of coupling of retention mechanisms are explained.
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