Elution behavior of polyethylene and polypropylene standards on carbon sorbents

Chitta, Rajesh; Macko, Tibor; Brüll, Robert; Kalies, Grit

doi:10.1016/j.chroma.2010.10.036

Cited by 23 publications

(26 citation statements)

References 48 publications

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“…when the column is substituted by a capillary. This approach was introduced by Macko et al . The capillary must be long and narrow enough to produce peaks of sizes similar to the LC CC peaks.…”

Section: Resultsmentioning

confidence: 99%

Liquid chromatography of synthetic polymers under critical conditions of enthalpic interactions 4: Sample recovery

et al. 2013

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Reduced sample recovery is a frequent feature of LC of macromolecules under critical conditions of enthalpic interactions (LC CC). Several methods of assessment of LC CC sample recovery are compared. A novel approach is based on an online combination of the. The LC CC column with a noninteractive SEC column. It provides not only the amount but also the molar mass of the eluted/withheld polymer. The procedure was tested with poly(methyl methacrylate), bare silica gel column packings, and "critical eluent" tetrahydrofuran/toluene. It was shown that macromolecules with higher molar masses were preferentially trapped within the LC CC column packing so that the eluted part of the sample was no longer representative. The incomplete polymer elution can make the LC CC polymer analyses susceptible to significant experimental errors.

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Section: Resultsmentioning

confidence: 99%

Liquid chromatography of synthetic polymers under critical conditions of enthalpic interactions 4: Sample recovery

et al. 2013

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“…Porous graphite carbon (PGC) is the best adsorbent for the separation, in brief, Hypercarb TM has been widely applied for the separation of aromatic compounds, racemic mixture, and polymers [42][43][44][45][46]. Then, we finally demonstrated the separation of aromatic compounds with the C70 column comparted to the separation by the PGC column.…”

Section: Separation Of the Aromatic Compounds With C70 Column And Pormentioning

confidence: 99%

Development of a C<sub>70</sub>-Fullerene Bonded Silica-Monolithic Capillary and Its Retention Characteristics in Liquid Chromatography

et al. 2017

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In this report, C 70 -fullerene (C70), which has aspheric structure and greater π electrons compared to C 60 -fullerene (C60), was effectively immobilized onto the surface of a silica-monolithic capillary, and then the retention characteristics for polycyclic aromatic hydrocarbons (PAHs) due to π-π interaction were evaluated in liquid chromatography (LC). For the immobilization of C70, a C70 derivative via thermal reactive agent, perfluorophenylazide (PFPA) and N-hydroxysuccinimide (NHS) was synthesized. In comparison with a typical thermal reaction in an oil bath and a microwave, the latter reaction provided higher yield. Then, both the C70 and C60 monoliths were evaluated by LC with a variety of PAHs as the solutes. The results suggested that the specific interactions, such as dipole and induced dipole interactions were contributed between the bonded C70 and PAHs. Absorption spectra of PAHs with C60 or C70 and a computer simulation also supported these interactions. Furthermore, the comparison of the separations for PAHs and brominated benzenes with the C70 column and a porous graphite carbon packed column suggested that the interactions based on the polarization of the molecules contributed the separations.

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“…Measurements of the elution behavior of PE and PP in a series of solvents using various types of carbon sorbents (porous graphite, activated carbon and ZirChromCARB) revealed that PE and/or PP adsorbed fully or partially on these carbon substrates. Selective adsorption and hence selective separation can be achieved with different combinations of solvent/sorbent systems [87]. For example, although Hypercarb/1-decanol-TCB enables to separate PP according to tacticity, ZirChromCARB/2-ethyl-1-hexanol-TCB does not enable such a separation, which is advantageous for the chromatographic characterization of ethylene/propylene copolymers.…”

Section: Hplc Systems For Adsorption and Desorption Of Polyolefinsmentioning

confidence: 99%

A review on the development of liquid chromatography systems for polyolefins

Macko¹,

Brüll²,

Zhu

et al. 2010

J of Separation Science

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Polyolefins are the most widely produced synthetic polymer commodity and are found in countless applications ranging from bottles, packaging films to bullet-proof jackets, etc. Such widely different applications rely on high variability in the physical properties of polyolefins, which is a result of variations in microstructure, chemical composition and molar mass. Though polyolefins contain only carbon (C) and hydrogen (H) atoms, the microstructures of polyolefins are extremely variable, differing in the nature of the monomers (e.g. ethylene versus propylene), the degree of branching, chemical composition in the case of copolymers and finally their molar masses. Production, research and development of polyolefins require the analysis of polyolefin samples in terms of all these parameters. Development of efficient and robust analytical techniques based on the interactive LC is reviewed. The needed computational/theoretical studies to understand the retention mechanism in the newly developed chromatography systems are discussed.

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Elution behavior of polyethylene and polypropylene standards on carbon sorbents

Cited by 23 publications

References 48 publications

Liquid chromatography of synthetic polymers under critical conditions of enthalpic interactions 4: Sample recovery

Liquid chromatography of synthetic polymers under critical conditions of enthalpic interactions 4: Sample recovery

Development of a C<sub>70</sub>-Fullerene Bonded Silica-Monolithic Capillary and Its Retention Characteristics in Liquid Chromatography

A review on the development of liquid chromatography systems for polyolefins

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