Living random and block copolymerization of ethene and propene on a tailor-made phenoxyimine catalyst and characterization of the resulting high molecular weight PE-block-P(E-co-P) block copolymers

Weiser, Marc-Stephan; Thomann, Yi; Heinz, Lars-Christian; Pasch, Harald; Mülhaupt, Rolf

doi:10.1016/j.polymer.2006.04.045

Cited by 37 publications

(19 citation statements)

References 16 publications

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“…36 Using this approach it was for the first time possible to separate ethylene-propylene (EP) copolymers according to their chemical composition. 45,46 However, there is still a significant influence of the molar mass on the separation, which makes it unpractical for routine analysis.…”

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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“…The products were characterized by a combination of different analytical techniques including CRYSTAF, 13 C NMR, and DSC. Weiser et al [55] synthesized and characterized high molar mass PE-block-P(E-co-P) type block copolymers on a tailor-made phenoxyimine catalyst. The products covered the entire feasible range of chemical compositions.…”

Section: Crystallization Analysis Fractionationmentioning

confidence: 99%

“…This chromatographic approach was also applied to the separation of EPC [55] and for the separation of various polyolefins with regard to the chemical composition of the components [154].…”

Section: Ht-hplc Based On Precipitation-redissolutionmentioning

confidence: 99%

Recent Advances in High-Temperature Fractionation of Polyolefins

Pasch

Malik

Macko³

2012

Advances in Polymer Science

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“…In this chromatographic system, PE precipitated from the mobile phase because a nonsolvent 1-decanol was used as eluent. The precipitation enabled the separation of isotactic PP from linear PE [60,64] as well as the separation of ethylene-propylene copolymers [66,67] according to their chemical composition. Separations of ethylene-butene and ethylene-hexene copolymers were evaluated in this sorbent/solvent system by Dolle et al [68] which showed that PE with low molar mass (o20 kg/mol) is soluble in EGMBE [64] and thus may elute without retention from the column.…”

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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Living random and block copolymerization of ethene and propene on a tailor-made phenoxyimine catalyst and characterization of the resulting high molecular weight PE-block-P(E-co-P) block copolymers

Cited by 37 publications

References 16 publications

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

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

Recent Advances in High-Temperature Fractionation of Polyolefins

A review on the development of liquid chromatography systems for polyolefins

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