Simulation of Surface-Directed Phase Separation in a Solution- Processed Polymer/PCBM Blend. ... surface energies of the fluid phase constituents with a mean field ... The TIPS process is comprised of the following steps: (1) A homogeneous solution is formed by melt-blending the polymer with a high-boiling, low molecular weight liquid or solid referred to as the diluent. (2) The solution is then cast into the desired shape. (3) The cast solution is cooled to induce phase separation and polymer solidification.
The phase sepn. kinetics of an 8% soln. of a polystyrene-polybutadiene (50:50) blend in dioctyl phthalate following cessation of a steady shear is monitored with this instrument. The sample is two-phase in the quiescent state and the applied shear is sufficient to suppress all scattering obsd. from the quiescent sample (shear-induced mixing).
Purchase New Models of the Cell Nucleus: Crowding, Entropic Forces, Phase Separation, and Fractals, Volume 307 - 1st Edition. Print Book & E-Book. ISBN 9780128000465, 9780128002520 for a shear-induced phase separation has been lacking. We present light- and neutron-scattering experiments which provide strong evidence that shear flow can cause a complete demixing phase transition in an entangled polymer solution. The most interesting result is that large amplitude oscillatory shear flow can cause the
Preparation of a Unique Microporous Structure via Two Step Phase Separation in the Course of Drying a Ternary Polymer Solution Phase Separation in Water-Ethanol Polymer Solutions Studied by NMR Methods H. Kouˇrilova and L. Hanykova Charles University, Faculty of Mathematics and Physics, Prague, Czech Republic. Abstract. We applied 1H and 13C NMR spectroscopy to investigate a phase tran-sition and a cononsolvency eﬀect of uncharged poly(N-isopropylmethacrylamide) Electrohydrodynamic Effect on Phase Separation Morphology in Polymer Blend Films. Langmuir 2004, 20 (4) , 1234-1238. DOI: 10.1021/la0302100. Wenjun Gan,, Yingfeng Yu,, Minghai Wang,, Qingsheng Tao, and, Shanjun Li. Viscoelastic Effects on the Phase Separation in Thermoplastics-Modified Epoxy Resin.
Phase Separation in the Co-Extruded Polymer Instability Flow in the Multi-Layered Copolymer This technique is useful to identify composite or blended materials that have different phases.
Aqueous two-phase system (ATPS) is a liquid–liquid fractionation method. The method is based on incompatibility of two aqueous solutions such as a polymer/salt system [e.g. polyethylene glycol (PEG) and potassium phosphate], a polymer/polymer system (e.g. PEG/dextran) (Show et al. 2013; Rosa et al. 2010), an ionic liquid (IL) and a salt system, and a low molecular weight alcohol and a salt ... Laar, J. J. van: Über den Zusammenhang zwischen der Abweichung der Dampfdruckkurve von binären Gemischen normaler Stoffe von der geraden Linie, und der Mischungswärme in der flüssigen Phase. Viscoelastic phase separation may be a ‘general’ model of phase separation, which includes solid and fluid models as special cases: for example, fluid phase separation described by model H, which is believed to be the usual case, can be viewed as a “special” (rather rare) case of viscoelastic phase separation. for phase separation through long-range interchain attractions. Developing a fundamental understanding of these driving forces requires building on theoretical approaches developed for describing the phase separation of polyelectrolytes, such as that of Overbeek and Voorn (Box1). The adaptation of this theory and Simulation of Surface-Directed Phase Separation in a Solution- Processed Polymer/PCBM Blend. ... surface energies of the fluid phase constituents with a mean field ... R t t during the course of phase separation, where is the growth exponent polymer solutions and at the same time have much better5 . The dynamics and morphology of phase separation also depend on the particular systems. In small-molecule systems the morphology of phase separation is quite simple, and it is determined by the relative concen- Separation and purification, in chemistry, separation of a substance into its components and the removal of impurities. There are a large number of important applications in fields such as medicine and manufacturing. Since ancient times, people have used methods of separating and purifying chemical
In 1918, Zsigmondy and Bachmann presented a new method to induce phase separation of a homogeneous polymeric solution from a vapor phase. The so-called vapor-induced phase separation (VIPS) was born. In a century, the body of knowledge on polymer membranes and hydrogels prepared by VIPS has grown importantly, which suggests the need for a ... TY - GEN. T1 - Morphology control of polyimides by using phase separation during polymerization. AU - Kimura, Kunio. PY - 2006. Y1 - 2006. N2 - Polyimides are useful high-performance plastics, and their properties are strongly influenced by the morphology including molecular orientation The morphology control of polyimide is required to create structural materials and devices.
phase separation, which gives rise to a polymer-rich phase and a polymer-poor (pore) phase. Figure1a lists a number of phase separation microstructures[28–39] in different polymer solutions. The phase separation in polymer solutions is premised on the Flory–Huggins theory,[40,41] according to which the Gibbs free occurs between the polymer solution and the bath. The intrusion of non-solvent reduces the thermodynamic stability of the polymer solution, leading to the phase separation that resolves into two phases, i.e. polymer-rich and polymer-lean. From the former phase a continuous polymer matrix is
The phase sepn. kinetics of an 8% soln. of a polystyrene-polybutadiene (50:50) blend in dioctyl phthalate following cessation of a steady shear is monitored with this instrument. The sample is two-phase in the quiescent state and the applied shear is sufficient to suppress all scattering obsd. from the quiescent sample (shear-induced mixing). Phase separation and gelation in polymeric systems are of technological as well as fundamental lilterest. The equilibrium aspects of phase separation phenomena have been extensively studied 1~0th in polymer blends and solutions [1,2]. The initial process of phase separation usually OC- In solutions with high CO2 level, in addition to the gelation or crystallization boundaries, a liquid-liquid phase separation boundary was also observed. The phase separation path followed was found to influence the eventual morphology and the crystal state of the polymer.
Prove that for a polymer solution in the athermal limit (ΔHm = 0), no phase separation can occur in the Flory-Huggins model. (Hint: ΔGm < 0 means that mixing is spontaneous, but it does no say by itself whether there is one phase or two.) An interfacial instability in a transient wetting layer leads to lateral phase separation in thin spin-cast polymer-blend ﬁlms SASHA Y. HERIOT*AND RICHARD A. L. JONES Department of PhysicsandAstronomy, HicksBuilding, HounsﬁeldRoad, Universityof Shefﬁeld, ShefﬁeldS37RH, UK *e-mail:[email protected]ﬁeld.ac.uk A capillary-induced phase separation (CIPS) can arise in a polymer solution enclosed between two walls, provided the solution is close to phase separation. Here the CIPS phenomenon is investigated in binary and quasi-binary polymer solutions by a mean-field lattice theory.
Abstract. A brief overview of the kinetics of phase separation in polymer solutions and gels i s pre-sented. Smal l angle light scattering measurements of the t i m e evolution of the structure factor following a quench into the spinodal region for polystyrene cyclohexane solutions sh0.w several unusual features as compared t o either polymer blends or simple binary liquid mzzkures. one polymer wets another [17,22–27]. Phase separation is a well-known phenomenon in polymer chemistry . However, its application to biomacromolecules is a much more recent development. Some proteins, such as hemoglobin, had previously been reported to undergo phase separation at high concen- Prove that for a polymer solution in the athermal limit (ΔHm = 0), no phase separation can occur in the Flory-Huggins model. (Hint: ΔGm < 0 means that mixing is spontaneous, but it does no say by itself whether there is one phase or two.) matrix and elastic forces in the polymer matrix [16,18], compete with each other to determine the phase separation dynamics of PDLCs. In this paper, we demonstrate that the phase separation dynamics are influenced by the surface effect for a PDLC confined in a thin cell.
casting a polymer solution on a support and then bringing the solution to phase separation by means of solvent outflow and/or nonsolvent inflow. Thus, in most cases at least three components are involved: a polymer, a solvent and a nonsolvent. Exchange of the latter two leads to a The phase separation in solutions of high polymers in the same solvent (technically known as incompatibility) has been studied for fourteen high polymers (cellulose, vinyl, and acrylic derivatives ... In this lesson, we're going to take about phase, let me start again. In this lesson, we're going to talk about phase separation and critical points. If you recall, back in the early part of the module we discussed a critical point with respect to a material, like either water or CO2.
of polymer walls using the phase separation method is recommended if clear phase separation can be obtained while maintaining the initial alignment of LC molecules. Once we can form high quality polymer walls in a LC cell, their application need not be limited to the enhancement of the intrinsic strength or the maintenance of the cell-gap Significant parallels exist between the phase separation behavior of polymers in solution and the types of biomolecular condensates, or ‘membraneless organelles,’ that are of increasing interest in living systems. Liquid-liquid phase separation allows for compartmentalization and the sequestration of materials, and can be harnessed as a sensitive strategy for responding to small changes in ...
Table C presents a summary of the phase characteristics for the two principal HPLC separation modes based upon polarity. Remember, for these polarity-based modes, like attracts like. Table C: Phase Characteristics for Separations Based on Polarity. Hydrophilic-Interaction Chromatography [HILIC]
'Staff publications' is the digital repository of Wageningen University & Research 'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.