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2017 scientific papers

Scientific papers on liquid chromatography:

New evaporative light scattering detector for high temperature gel permeation chromatography, Boborodea, A.; O'Donohue, S. Int. J. Polym. Anal. Charact., in press

Fast Gel Permeation Chromatography – Mass Spectrometry method for polymer and additive analysis, Boborodea, A.; Graham, C. Int. J. Polym. Anal. Charact., in press

Assessing the suitability of a green solvent for gel permeation chromatography – mass spectrometry analysis, Boborodea, A.; O'Donohue, S. Int. J. Polym. Anal. Charact., Vol. 22, Issue 4, 305-309, 2017

Gel Permeation Chromatography-Atmospheric Pressure Chemical Ionization-Mass Spectrometry for characterization of polymer additives, Boborodea, A.; Brookes, A. Int. J. Polym. Anal. Charact., Vol. 22, Issue 3, 210-214, 2017

Gel Permeation Chromatography-Atmospheric Pressure Chemical Ionization – Mass Spectrometry for oligomer characterization, Boborodea, A.; Graham, C. Int. J. Polym. Anal. Charact., Vol. 22, Issue 2, 180-186, 2017

Low solvent consumption gel permeation chromatography method, Boborodea A.; O’Donohue S., Int. J. Polym. Anal. Charact., Vol. 21, Issue 8, 657-662, 2016


Publications 2016


Characterization of Low-Density Polyethylene in Dibutoxymethane by High-Temperature Gel Permeation Chromatography with Triple Detection
Adrian Boborodea, Francis M. Mirabella & Steve O’Donohue, Chromatographia, An International Journal for Rapid Communication in Chromatography, Electrophoresis and Associated Techniques. ISSN 0009-5893, Volume 79, Combined 15-16.

ABSTRACT

The study presents the possibility to replace the 1,2,4-trichlorobenzene (TCB) for the analysis by gel permeation
chromatography (GPC) of low-density polyethylenes (LDPE) with dibutoxymethane (DBM, butylal), a halogen free and less toxic solvent. The molecular weight distributions and the viscosity plots were measured for commercial LDPE samples solubilized in TCB, and DBM, using a GPC system with triple detection (light scattering, differential refractive index and viscometer). Similar results were obtained in both solvents for the molecular weight and long chain branching distributions of the analyzed resins, thus confirming the possibility to replace TCB with DBM for the analysis by high-temperature GPC of all types of polyolefins.

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GPC and TREF, complementary techniques for complete analysis of polyethylene resins
Adrian Boborodea & Alan Brookes, CHIMIE NOUVELLE N° 121, mai 2016, pages 26-32

ABSTRACT

In function of the catalyst, different structures of polyethylene resins are obtained, with relatively complex distributions of molecular weight, short chain and long chain branches. The analytical methods of choice to characterize these chemical structures are gel permeation chromatography (GPC) and temperature rising elution fractionation (TREF). The application of these techniques, implemented at Certech in a collaboration with Agilent Technologies, are explained for different types of polyethylene resins.

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Characterization of Polyphenylene Sulfide Using Gel Permeation Chromatography with Triple Detection; Adrian Boborodea & Alan Brookes, International Journal of Polymer Analysis and Characterization, Vol. 20, Issue 2, 2015, pages 172-179


ABSTRACT

The increasing world demand for polyphenylene sulfide (PPS) due to its unique properties has augmented the pressure on development of analytical methods to evaluate its molecular weight distribution and structure. Whilst gel permeation with triple detection (GPC3D) has been considered for PPS analysis, its development and effectiveness has been impaired because of, firstly, the high temperature needed to maintain solubility (>205°C), and, secondly, a very low dn/dc for the polystyrene calibration standards in 1-chloronaphthalene. This article presents practical recommendations to overcome these early difficulties by discussing the results obtained on PPS samples analyzed with a commercially available GPC3D instrument.

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Fast Analytical Temperature Rising Elution Fractionation (TREF) of Polypropylenes – F. M. Mirabella, A. Boborodea, International Journal of Polymer Analysis and Characterization, vol 20, no 3, 261-267 (April 2015)

ABSTRACT

Analytical temperature rising elution fractionation (TREF) is a complementary technique of gel permeation chromatography (GPC) for the analysis of polyolefin structure. By connecting a high-temperature GPC with a gas chromatograph (GC) oven it is possible to build a fast analytical TREF, which permits a dramatic reduction in analysis time by directly injecting the polymer solution onto the cold column, as compared with the traditional TREF in which the slow cooling step usually takes more than 40 h. The method was successfully applied on six commercial random and homo polypropylenes for which similar thermograms were obtained for fast- and slow-cooling TREF. The obtained results show subtle differences in the behavior of polypropylene melting in solution as compared with previously analyzed polyethylene. The most important is the difference of 12.6°C between the melting temperatures in the presence of trichlorobenzene and xylene, which is much higher for polypropylene than the 3.7°C measured for polyethylene.

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Characterization of Polyethylene Using Fast Analytical Temperature Rising Elution Fractionation with Triple Detection (ATREF 3D) – A. Boborodea, A. Brookes, International Journal of Polymer Analysis and Characterization, vol 20, no 3, 277-283 (April 2015)


ABSTRACT

A commercially available gel permeation chromatograph with triple detection (GPC3D) was coupled with a gas chromatograph to obtain a fast analytical temperature rising fractionation system with triple detection (ATREF3D). On this hybrid instrument we developed a fast method for evaluating in one run, and with less than 0.5 mg of sample, the density, molecular weight, and the type of polyethylene. The method was evaluated with excellent results on commercial polyethylene resins typically used for film and packaging applications.

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Characterization of Polyethylene in Dibutoxymethane by High-Temperature Gel Permeation Chromatography with Triple Detection – A. Boborodea, F. Collignon, A. Brookes, International Journal of Polymer Analysis and Characterization, vol 20, no 4, 316-322 (May 2015)

ABSTRACT

This study presents the possibility of replacing the 1,2,4-trichlorobenzene (TCB) recommended by ASTM D 6474 for the analysis by gel permeation chromatography (GPC) of linear polyethylenes with dibutoxymethane (DBM, butylal), a halogen-free and less toxic solvent. The molecular weight distributions as well as the K and alpha parameters of the Mark-Houwink-Sakurada relationship were measured for polyethylene solutions in TCB and DBM, using a GPC system with triple detection (light scattering, differential refractive index, and viscometer). For commercial metallocene polyethylene resins typically used for film and packaging applications, the GPC method in DBM provided results comparable to those obtained in TCB.

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