Certech ASBL

Seneffe, Belgium

Certech ASBL

Seneffe, Belgium
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Boborodea A.,Certech ASBL | O'Donohue S.,Agilent Technologies
International Journal of Polymer Analysis and Characterization | Year: 2017

The study presents the possibility of performing the analysis of oligomeric structures and polymer additives by gel permeation chromatography (GPC) with atmospheric pressure chemical ionization (APCI) mass spectrometry (MS) in dibuthoxymethane (DBM, butylal), a halogen-free and less hazardous solvent than typically used chloroform and tetrahydrofuran. Polystyrene oligomers and Irganox® additives were analyzed in DBM using 2.1 mm internal diameter GPC columns, allowing to decrease the flow rate down to 50 µL/min, compatible with APCI–MS interface. The ionization was controlled by adding 1% chloroform in DBM to obtain (M+Cl)− adducts, allowing a fast optimization of method parameters. © 2017 Taylor & Francis


Boborodea A.,Certech ASBL | Brookes A.,Agilent Technologies
International Journal of Polymer Analysis and Characterization | Year: 2017

The study presents the possibility to use gel permeation chromatography (GPC) with atmospheric pressure chemical ionization (APCI)-mass spectrometry for the analysis of polymer additives having molecular weights up to 2,000 g mol−1. Irganox 1010, Irganox 1035, Irganox 1076, and Irganox 3114 were analyzed in chloroform using 2.1-mm-internal-diameter GPC columns at the optimum flow rate of 50 µL min−1. Based on the chemical formula, the APCI interface combined with chlorine ionization enabled us to predict the expected mass spectrum and to build libraries without needing to inject each additive separately. Quantification limits of about 100 µg of additive in 1 g of polymer (100 ppm) can be reached using single-ion-monitoring methods based on the calculated isotope distribution. © 2017 Taylor & Francis


Boborodea A.,Certech ASBL | Brookes A.,Agilent Technologies
Polymer Testing | Year: 2017

The study explored the optimum conditions for sample preparation of polyolefins for high temperature gel permeation chromatography (GPC) recommended by ASTM D 6474, and the potential for reducing solvent consumption by using columns with reduced internal diameter. A polypropylene sample with high crystallinity and high molecular weight was selected, because this is one of the most difficult polyolefins to analyze by GPC. Sequences of injections covering 20 h showed that, at 160 °C, 2 h is enough to dissolve this sample, and that the antioxidant concentration is the critical parameter in obtaining reproducible GPC results. By using one column with an internal diameter (ID) of 4.6 mm and a flow rate of 0.3 mL/min, instead of the classical set of 3 columns of 7.5 mm ID and a flow rate of 1 mL/min, the solvent consumption can be reduced to about 10%. © 2017 Elsevier Ltd


Boborodea A.,Certech ASBL | Cleaver G.,Agilent Technologies
International Journal of Polymer Analysis and Characterization | Year: 2017

This study presents gel permeation chromatography (GPC) coupled with mass spectrometry (MS) as a suitable method to evaluate molecular weight distribution, oligomeric structure, and additives of commercial polystyrene resins in just 4 min. The chromatogram recorded by ultraviolet (UV) detection gives information on the high molecular mass fractions, while the mass detector provides knowledge on the chemical structure and concentration of oligomers and additives. A good agreement for the average molecular weights of the broad polystyrene reference SRM 706 and an excellent correlation with the expected isotope distributions for oligomers and additives were obtained using this fast GPC–UV–MS method. © 2017 Taylor & Francis


Boborodea A.,Certech ASBL | Brookes A.,Agilent Technologies
International Journal of Polymer Analysis and Characterization | Year: 2015

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. © 2015, Copyright © Taylor & Francis Group, LLC.


Boborodea A.,Certech ASBL | Mirabella F.M.,Mirabella Practical Consulting Solutions Inc.
International Journal of Polymer Analysis and Characterization | Year: 2014

Temperature rising elution fractionation (TREF) became the preferred technique to characterize the short chain branching distribution of polyethylene copolymers. Due to technical limitations, preparative TREF (PTREF) is usually done in xylene, while trichlorobenzene is used in analytical TREF (ATREF). Attempts to correlate the TREF elution temperatures based on data published by different authors erroneously showed higher elution temperatures for xylene than for trichlorobenzene. Our study rectifies this error. The experiments were done in both solvents on the same analytical TREF instrument. For the analyzed polyethylene copolymers, we found that the average elution temperature in xylene is 3.7° ± 1°C lower than in trichlorobenzene. © 2014 Copyright Taylor & Francis Group, LLC.


Boborodea A.,Certech ASBL | Luciani A.,Certech ASBL
International Journal of Polymer Analysis and Characterization | Year: 2014

Fast analytical temperature rising elution fractionation (ATREF) is a recently proposed method to evaluate the molecular structure of polyolefins with unimodal distributions. In this article, we compare the results obtained by this method and the classical slow cooling rate ATREF. An interpretation of previous results found in the literature is proposed in order to explain one of the limitations usually associated with this technique. Practical recommendations are given to build columns adapted to this technique and to efficiently adjust the method parameters. © 2014 Taylor & Francis Group, LLC.


Boborodea A.,Certech ASBL | Michel J.,Total Research and Technology | Luciani A.,Certech ASBL
International Journal of Polymer Analysis and Characterization | Year: 2014

Conventional analytical temperature rising elution fractionation (ATREF) is performed using slowly crystallized polymers in about 16 h. In this work, we developed a fast ATREF method in which the polymer sample is directly injected on the column at room temperature, thus reducing the analysis time to about 1 h. The method was tested using four metallocene polyethylenes with unimodal short chain branching distributions and different densities, previously analyzed by ATREF using a cooling rate of 0.1°C/min. The obtained results demonstrate that the fast ATREF method is very effective and accurate in evaluating short chain branching distribution for polyolefins having unimodal distributions. © 2014 Copyright Taylor & Francis Group, LLC.


Boborodea A.,Certech ASBL | Luciani A.,Certech ASBL
LCGC North America | Year: 2013

This article presents a new method to evaluate the temperature shift observed in analytical temperature rising elution fractionation (ATREF). The evaluation is based on the dependence of the measured peak temperature as a function of heating rates. Application of the proposed method does not require any knowledge of the fluid circuit characteristics geometry and avoids the use of narrow preparative TREF standards. The results are found to be more accurate than the method that is usually applied.


Patent
Certech A.S.B.L. | Date: 2012-02-29

An extinguisher has a cylinder capable of containing a fire-extinguishing product, and means for releasing the fire-extinguishing product from the cylinder and comprising at least one compressed gas cartridge, at least two tanks, each capable of containing at least one additive product, and means for releasing at least one additive product from each of the at least two tanks and for mixing with the fire-extinguishing product during the release of the fire-extinguishing product. At least one of the tanks is removable relative to the extinguisher. A cartridge having a plurality of tanks is usable in the extinguisher.

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