Elution behavior of polyethylene in polar mobile phases on a non-polar sorbent

Macko, Tibor; Pasch, Harald; Kazakevich, Yuri; Fadeev, Alexander Y.

doi:10.1016/s0021-9673(02)02062-9

Cited by 44 publications

(32 citation statements)

References 19 publications

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“…[36][37][38][39][40][41][42][43] PE or PP were selectively adsorbed in the zeolites [40][41][42][43] or HPLC separation has been based on selective precipitation of PE. 36,38 Lehtinen und Paukerri 44 found that ethylene glycol monobutyl ether (EGMBE) dissolves isotactic polypropylene (iPP) but not linear PE. The retained PE may then be eluted applying a gradient EGMBE !…”

Section: Introductionmentioning

confidence: 99%

Characterization of ethylene‐propylene copolymers with high‐temperature gradient adsorption liquid chromatography and CRYSTAF

Macko¹,

Brüll²,

Wang

et al. 2011

J of Applied Polymer Sci

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Blends of linear polyethylene (PE) and isotactic polypropylene (iPP) with different average molar masses and a series of ethylene-propylene (EP) copolymers with different chemical composition as well as blends of PE, Ipp, and EP copolymers were separated using a carbon-column packing (HypercarbV R ) and gradients of 1-decanol or 2-ethyl-1-hexanol ! 1,2,4-trichlorobenzene (TCB). The separation is based on full adsorption of linear PE on the carbon sorbent at temperature 160 C. However, iPP is not adsorbed and elutes in size exclusion mode. The random EP copolymers have been adsorbed in the column packing and separated according to their average chemical composition after application of the gradient starting with alcohol and ending with pure TCB. The elution volumes of the copolymers depended linearly on the average concentration of ethylene in the copolymers. The HPLC elution profiles were correlated with the CRYSTAF elution profiles. In contrast to CRYSTAF, fully amorphous polyolefin samples were separated with the high-temperature adsorption liquid chromatography.

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Section: Introductionmentioning

confidence: 99%

Characterization of ethylene‐propylene copolymers with high‐temperature gradient adsorption liquid chromatography and CRYSTAF

Macko¹,

Brüll²,

Wang

et al. 2011

J of Applied Polymer Sci

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“…Lehtinen and Paukkeri found that ethylene glycol monobutyl ether (EGMBE) is a good solvent for isotactic PP but a nonsolvent for linear PE [62]. This observation forms the basis for the HT HPLC separation of isotactic PP from linear PE using EGMBE as eluent [63,64]. The column used by Macko et al…”

Section: Chromatographic System Based On the Precipitation-dissolutiomentioning

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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“…The first attempts to use interactive stationary phases for the separation of polyolefins started in 2003. Macko et al used an isocratic separation system for PE-PP blends [136,137]. For the separation of the two polymers, TCB was used as a thermodynamically good solvent for both components and ethylene glycol monobutylether (EGMBE) as eluent.…”

Section: Interaction Chromatographymentioning

confidence: 99%

“…It has been shown now that EGMBE as the mobile phase and an oligo(dimethyl)siloxane modified silica gel as the stationary phase enable HPLC separation of polyethylene from polypropylene. As the injection solvent in this case TCB is used [136]. In this system PP eluted in the size exclusion mode whereas PE eluted with the solvent peak at limiting conditions.…”

Section: Ht-hplc Based On Precipitation-redissolutionmentioning

confidence: 99%