Tuneable extraction systems based on hyperbranched polymers

Goetsch, Thomas; Zimmermann, Patrick; Enders, Sabine; Zeiner, Tim

doi:10.1016/j.cep.2015.07.021

Cited by 8 publications

(7 citation statements)

References 34 publications

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“…Hereby, z stands for the lattice coordination number, while ε/ k B T is the dimensionless interaction energy of nearest neighbor segments. The lattice coordination number was set to z = 6 according to former publications ,, and the interaction energy ε reads as where ε AA , ε BB , and ε AB are the interaction energies between two segments of type AA , BB , and AB , respectively. The LCT is written in terms of segment fractions, which can be calculated by eq . …”

Section: Theorymentioning

confidence: 99%

Liquid–Liquid Equilibrium and Interfacial Tension of Hexane Isomers–Methanol Systems

Goetsch

Danzer

Zimmermann

et al. 2017

Ind. Eng. Chem. Res.

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Liquid–liquid equilibrium (LLE) and therefore interfacial tension are highly dependent on molecular architecture. In processes, where branched molecules are involved, these properties often cannot be measured; therefore, there is a need for thermodynamic modeling to make these properties accessible. A methodology, which allows for the prediction of liquid–liquid equilibria of systems containing branched molecules, was developed recently, where the lattice cluster theory is combined with the chemical association lattice model. In this contribution, it was proved whether the methodology can consider small changes in molecular architecture. Therefore, binary LLE of methanol and four hexane isomers were estimated and predicted. All predicted LLE showed a very good agreement with the experimental data. Additionally, the interfacial tension and interfacial concentration profiles were estimated for the investigated systems and calculated by the density gradient theory. For that, its influence parameter was adjusted to a single data point.

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Section: Theorymentioning

confidence: 99%

Liquid–Liquid Equilibrium and Interfacial Tension of Hexane Isomers–Methanol Systems

Goetsch

Danzer

Zimmermann

et al. 2017

Ind. Eng. Chem. Res.

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“…Thus, there are many advanced applications of HBPs in chemical engineering. 26 HBPs can be used as a phase forming component for aqueous two-phase systems (ATPS) based on advantages of the lower viscosity, biocompatibility, thermal and chemical stability, and a wide range of different functional end groups. 27 Much research has been devoted to designing various advanced materials based on highly branched polymers.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Moreover, highly branched polymers (HBPs) display superior stimuli-responsiveness because of their high density of functionalities. Thus, there are many advanced applications of HBPs in chemical engineering . HBPs can be used as a phase forming component for aqueous two-phase systems (ATPS) based on advantages of the lower viscosity, biocompatibility, thermal and chemical stability, and a wide range of different functional end groups .…”

Section: Introductionmentioning

confidence: 99%

“…In its relative simple structure, comb-like polymers are usually formed by long side chains unlike very short and dense branches of hyper-branched or dendrimer polymers, which make it exhibit different properties from hyper-branched or dendrimer polymers. Predominantly, studies have been aimed at the synthesis and characterization of star-shaped, − hyper-branched, ,, and dendrimer polymers. − Nevertheless, a few scientific literatures research the comb-like biodegradable polymers, e.g., Ninago reported the influence of branches on the thermal behavior of grafted block copolymers based on ε-caprolacone. Even more, we only found one report about the star–comb branched biodegradable polymers other than the works of our group, e.g., Szoka described a six-step synthesis to biodegradable star–comb PEGylated polymers with favorable pharmaceutical properties by ATRP.…”

Section: Introductionmentioning

confidence: 99%

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Relationships between Architectures and Properties of Highly Branched Polymers: The Cases of Amorphous Poly(trimethylene carbonate) and Crystalline Poly(ε-caprolactone)

et al. 2016

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Highly branched polymers (HBPs) are a special class of functional polymeric materials and possess unique properties due to their unique topological structure. A new series of highly branched linear-comb and star-comb amorphous poly(trimethylene carbonate)s (PTMC) and crystalline poly(ε-caprolactone)s (PCL) with well-defined structure and high molecular weight were first synthesized using hydroxylated polybutadiene (HPB) as macroinitiators by simple "one-step" and "graft from" strategies. It is expected that the impact of long-chain, highly branched architecture on the properties of amorphous and crystalline polymers, respectively, is different. We explored systematically for the first time the effect and comparison of branched architectures on the physical and chemical properties of highly branched PTMCs and PCLs, including the intrinsic viscosity, glass transition, thermal degradation, creep property, rheological property, and crystallization and melting behaviors. It is found that the intrinsic viscosities in solution for both comb-branched PTMCs and PCLs were much lower compared with their linear and star counterparts arise from more compact structure and smaller hydrodynamic volumes. For amorphous PTMC, the creep strain and rate increased remarkably with degree of branching increasing due to the shorter side chains making it difficult for the highly branched molecules to entangle. For crystalline PCL, both WAXD and DSC analysis of PCLs with different topological structures indicated that the comb branched architectures have no significant influence on the crystal structure of PCL, but greatly promote the crystallization behavior, e.g., higher crystallinities. The deep understanding of structure-property relationship expects to guide the synthesis of designed functional polymer materials and the processing of polymer products.

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“…In LCT the architecture of the respective molecular component can be considered in detail. In the last years, LCT has been applied to calculate liquid–liquid equilibria, − solid–liquid equilibria, , as well as solid–liquid–liquid equilibria , of n -alkanes, hyperbranched polymers, and monodisperse semicrystalline high polymers and polymer solvent systems. By introduction of empty lattice size, an EOS can be formulated. , …”

Section: Introductionmentioning

confidence: 99%

Ternary Solid–Liquid Equilibria of Semicrystalline, Branched Polymer Solvent Mixtures—A Theoretical Study by Means of Lattice Cluster Theory

Fischlschweiger¹,

Enders

2016

J. Chem. Eng. Data

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Analytical polymer separation techniques, like CRYSTAF (crystallization analysis fractionation) and TREF (temperature rising elution fractionation), play a crucial role in gaining insight into the interrelation between molecular architecture and properties. Often polymer samples are semicrystalline, as it consists of amorphous regions which exhibit a liquid-like structure, and ordered crystallized structures called crystallites. Additionally, polymers exhibit a certain degree of short-chain branching, and they are polydisperse with respect to molecular weight and chemical composition. To explain the theoretical background of common polymer separation techniques, a fair prediction of solid–liquid equilibria (SLE) of polymer solvent systems is required. By application of Lattice Cluster Theory (LCT), developed by Freed and co-workers, the molecular architecture can be considered. Recently, LCT was applied to calculate the SLE of binary semicrystalline, high-polymer solvent mixtures having an arbitrary molecular architecture of both polymer and solvent, in which the polymer is considered to be monodisperse. Besides influences of degree of polymer crystallinity, nucleation entropy, and degree of branching, in this contribution the impact of polymer polydispersity on the SLE of high-polymer solvent mixtures is considered. This is realized by application of the LCT-based theory for predicting the SLE of discrete ternary high-polymer solvent mixtures made of two polymers and one solvent. Effects of semicrystallinity and molecular architecture of the respective components are studied for ternary systems.

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Tuneable extraction systems based on hyperbranched polymers

Cited by 8 publications

References 34 publications

Liquid–Liquid Equilibrium and Interfacial Tension of Hexane Isomers–Methanol Systems

Liquid–Liquid Equilibrium and Interfacial Tension of Hexane Isomers–Methanol Systems

Relationships between Architectures and Properties of Highly Branched Polymers: The Cases of Amorphous Poly(trimethylene carbonate) and Crystalline Poly(ε-caprolactone)

Ternary Solid–Liquid Equilibria of Semicrystalline, Branched Polymer Solvent Mixtures—A Theoretical Study by Means of Lattice Cluster Theory

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