Tacticity Separation of Poly(methyl methacrylate) by Multidetector Thermal Field-Flow Fractionation

Greyling, Guilaume; Pasch, Harald

doi:10.1021/ac504651p

Cited by 27 publications

(34 citation statements)

References 25 publications

(43 reference statements)

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“…ThFFF is a sub‐technique of FFF that applies a temperature drop across an open, ribbon‐like channel in order to fractionate analytes according to size, chemical composition and microstructure . The first reported attempts to fully utilise the advantages and unique separation capabilities of ThFFF to separate micelles according to corona composition were performed on poly(methyl methacrylate)–polystyrene micelles in acetonitrile using a multidetector ThFFF setup as illustrated in Scheme .…”

Section: Characterisation Of Micelle Property Distributionsmentioning

confidence: 99%

Characterisation of block copolymer self‐assemblies by thermal field‐flow fractionation

Greyling

Pasch

2017

Polymer International

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The ability of block copolymers to self‐assemble into various nanostructures (such as micelles) has attracted significant attention over the years as these block copolymers provide a versatile platform that can readily be modified for a wide range of applications. As such, the solution behaviour of block copolymers has been at the forefront of the modern nanotechnology revolution. However, these novel block copolymer‐based self‐assemblies lack suitable characterisation techniques to determine size, molar mass and compositional distributions simultaneously. This mini‐review gives a short background on the current techniques used to determine important micelle properties as well as their limitations for characterising complex samples. Current column‐based fractionation techniques used for determining property distributions are addressed. As a result of the limitations of column‐based fractionations, a multidetector thermal field‐flow fractionation (ThFFF) approach is put forward as a powerful alternative for determining not only size and molar mass distributions, but also other micelle properties as a function of temperature. More importantly, ThFFF is highlighted as the only current characterisation platform capable of addressing the analytical challenges associated with compositional distributions of polymer self‐assemblies. © 2017 Society of Chemical Industry

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Section: Characterisation Of Micelle Property Distributionsmentioning

confidence: 99%

Characterisation of block copolymer self‐assemblies by thermal field‐flow fractionation

Greyling

Pasch

2017

Polymer International

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“…Further studies are underway that demonstrate the microstructure-based fractionation of PMMA [71] and a number of tactic copolymers. [72] CONCLUSIONS AND OUTLOOK Fractionation methods are powerful tools for the analysis of the microstructure of complex polymers.…”

Section: Microstructure Analysis By Channel-based Fractionationsmentioning

confidence: 99%

Advanced fractionation methods for the microstructure analysis of complex polymers

Pasch

2015

Polymers for Advanced Techs

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This review discusses some recent work on the microstructure analysis of complex polymers using advanced fractionation methods. Complex polymers are distributed in a number of molecular parameters including molar mass, chemical composition, molecular architecture, and microstructure. Molar mass and chemical composition analysis is typically conducted by a range of spectroscopic and chromatographic methods, size exclusion chromatography and high-performance liquid chromatography (HPLC) being the most important fractionation methods. It is shown that HPLC is also very sensitive regarding polymer microstructure and can be used for the fractionation of e.g. polymethacrylates, polyisoprene, and polybutadiene. The best approach to the quantitative analysis of microstructure distributions is the on-line coupling of the fractionation with 1 H nuclear magnetic resonance spectroscopy. The spectroscopic analysis of chromatographic fractions provides concentration profiles of the tactic units as a function of the chromatographic separation and can be used for both HPLC and size exclusion chromatography. Apart from column-based fractionations, channel-based fractionations such as thermal field flow fractionation are powerful tools for microstructure analysis of complex polymers. It has been shown very recently that thermal field flow fractionation is capable of fractionating polyisoprene and polybutadiene according to microstructure.

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“…The scalings α 1 = 1 and α 2 = 3 used above are physically motivated, as they belong to experimentally-demonstrated sub-techniques of FFF. Flow-FFF [37,39,66,67], thermal-FFF [41,68,69] and electrical-FFF [27,70,71] each have a force that scales as α i = 1, while sedimentation-FFF [25,72] (including gravitational-FFF [23,73]) is the most obvious commonly-used technique with α i = 3. External forces with scaling of α i = 2 are not commonly utilized by FFF apparatuses.…”

Section: Adverse-mode: Retention Ratio Peakmentioning

confidence: 99%

Adverse-Mode FFF: Multi-Force Ideal Retention Theory

Shendruk¹,

Slater

2015

Chromatography

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A novel field-flow fractionation (FFF) technique, in which two opposing external forces act on the solute particles, is proposed. When the two external forces are sufficiently strong and scale differently as a function of the solutes' property of interest (such as the solute particle size), a sharp peak in the retention ratio (dramatic drop in elution time) is predicted to exist. Because the external forces oppose one another, we refer to this novel technique as adverse-mode FFF. The location of this peak is theoretically predicted and its ideal width estimated. The peak can become quite sharp by simultaneously increasing the strength of both fields, suggesting that adverse-mode FFF could be a useful technique for accurately measuring single species solute size.

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Tacticity Separation of Poly(methyl methacrylate) by Multidetector Thermal Field-Flow Fractionation

Cited by 27 publications

References 25 publications

Characterisation of block copolymer self‐assemblies by thermal field‐flow fractionation

Characterisation of block copolymer self‐assemblies by thermal field‐flow fractionation

Advanced fractionation methods for the microstructure analysis of complex polymers

Adverse-Mode FFF: Multi-Force Ideal Retention Theory

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