On-line coupling of high temperature GPC and 1H NMR for the analysis of polymers

Hiller, Wolf; Pasch, Harald; Macko, Tibor; Hofmann, Martin; Ganz, Jürgen; Spraul, Manfred; Braumann, Ulrich; Streck, Roman; Mason, Jeff; Damme, F. Van

doi:10.1016/j.jmr.2006.09.004

Cited by 63 publications

(50 citation statements)

References 16 publications

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“…[4][5][6][7][8][9][10][11] The average chemical composition is determined mainly using FTIR or NMR spectroscopy. However, SEC separation may be combined with the on-line FTIR [12][13][14] or NMR 15 spectroscopic analysis. In such cases, information about the distribution of the chemical composition along the molar mass axis is obtained.…”

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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“…[47][48][49][50][51] The GPC results for the PPy and copolymer samples are given in Table 2. After y10 injections, the adsorption sites had become saturated, and full recovery was achieved.…”

Section: Gel Permeation Chromatographymentioning

confidence: 99%

Electrochemical synthesis of novel conductive polymer and corrosion protection properties on aluminium

Mert

Yazıcı

Lyon³

2013

Corrosion Engineering, Science and Technology

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In this study, the new original copolymer film of pyrrole and 2-amino-4-methyl-pyridine has been electrochemically synthesised on 7075 aluminium alloy. The synthesis was achieved in aqueous oxalic acid containing 1 : 1 monomer feed ratio. The characteristics of copolymer film were compared with polypyrrole film on Al under the same conditions. The characterisation of synthesised polymers was realised with the help of scanning electron microscopy. Fourier transform infrared spectroscopy and gel permeation chromatography techniques. The conductivity values of films were measured with four-probe technique. The stability of copolymer film as a coating material has also been investigated in 3?5% NaCl solution. The quantum theoretical calculations have been employed, and some parameters (dipole moment, energy of the highest occupied molecular orbital and lowest unoccupied molecular orbital) were determined. The calculated quantum parameters revealed correlation with experimental data. Under such severe conditions, the copolymer film exhibits protective coating behaviour on Al. This original, highly stable and conductive copolymer film can find wide application area for various purposes (anticorrosive, electrocatalytic, etc.).

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“…Such equipment became available only recently when a high-temperature flow-through NMR probe was introduced by Bruker. The construction and experimental setup of the LC-NMR coupling is described in detail by Hiller et al [130]. In brief, the NMR flow probe can operate at temperatures up to 150 C. The probe has an active flow cell with a volume of 120 mL.…”

Section: Coupled Sec-1 H-nmrmentioning

confidence: 99%

Recent Advances in High-Temperature Fractionation of Polyolefins

Pasch

Malik

Macko³

2012

Advances in Polymer Science

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On-line coupling of high temperature GPC and 1H NMR for the analysis of polymers

Cited by 63 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

Electrochemical synthesis of novel conductive polymer and corrosion protection properties on aluminium

Recent Advances in High-Temperature Fractionation of Polyolefins

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