Determination of the polymeric light stabilizer tinuvin 622 in polyolefins

Freitag, Wolfgang; Wurster, R.; Mady, N.

doi:10.1016/s0021-9673(01)83601-3

Cited by 8 publications

(3 citation statements)

References 9 publications

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“…It can be particularly useful in analysing for additives that are difficult to extract, although in such cases the calibration of standards may present a problem. The determination of the oligomeric HALS Tinuvin 622 by its saponification with tetrabutylammonium hydroxide (during the precipitation of the polymer) to form a diol and its subsequent quantification by HPLC has been reported [17].…”

Section: 'Non-extractable' Additivesmentioning

confidence: 99%

The separation and analysis of additives in polymers

Newton

1993

Polymer Characterisation

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This chapter describes the extraction, separation, identification and estimation of various organic and inorganic additives and polymeric materials in a range of plastic formulations such as poly(vinyl chloride), polypropylene, polyamide and polytetrafluoroethylene. It will concentrate primarily on their fractionation into, typically:(a) a solvent-soluble organic fraction (b) a solvent-insoluble inorganic or polymeric fraction (c) the solvent-soluble base polymer.The extraction techniques employed will include solvent dissolution and extraction, centrifugation, polymer precipitation, filtration and ashing. Details will be given of the identification of these fractions using IR spectroscopy, pyrolysisjGC, HPLC, mass spectrometry and NMR spectroscopy, often after further separation using either specific solvents or TLC [21]. All IR spectra are recorded over the region 4000-667 cm-1 (2.5-15.0 /lm).The estimation of individual components by gravimetric techniques, IR spectroscopy, UV -visible spectroscopy, HPLC or titrimetry will be described.The basic principles of solvent extraction, etc., for the analysis of plastics formulations are well established and docu'mented [1--4] and are still valid today. However, changes and improvements have been made, particularly in the fields of separation science and spectroscopy, to incorporate new ideas and instrumentation and to accommodate new additives. Despite such trends as robotics, the need for an experienced practical plastics analyst working at a bench using solvents, extraction flasks and beakers still exists.One theme running through this chapter will be that of method validation and the measurement of precision by way of calculated estimated standard deviations (sd) and coefficients of variance (cv) using 'check samples' of known formulation and a collection of reference polymers and additives of known provenance. This approach not only will be necessary for any laboratories seeking accreditation such as BS5750 or NAMAS, particularly as a means of demonstrating to external auditors the competence of B. J. Hunt et al. (eds.), Polymer Characterisation

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Section: 'Non-extractable' Additivesmentioning

confidence: 99%

The separation and analysis of additives in polymers

Newton

1993

Polymer Characterisation

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“…Size exclusion chromatography (SEC) is commonly used for molecular mass determination. Non-aqueous reversed phase high-performance liquid chromatography (HPLC) has also been used for determination of Chimassorb 944 in polyolefins for more than two decades [4][5][6][7][8][9]. In these two methods, the oligomeric Chimassorb 944 is eluted as a broad peak with no resolution of the individual components.…”

Section: Introductionmentioning

confidence: 99%

Separation and identification of an oligomeric light stabilizer Chimassorb 944 by gradient elution chromatography coupled with matrix-assisted laser desorption/ionization mass spectrometry

Kong

Diao

Wan

2014

Journal of Chromatography A

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“…Several HPLC methods have been reported describing a “single‐peak‐elution” without a further separation or characterization of the many compounds present in oligomeric HALS . Trones et al.…”

Section: Introductionmentioning

confidence: 99%

Separation and characterization of oligomeric hindered amine light stabilizers using high‐performance liquid chromatography with UV and quadrupole time‐of‐flight mass spectrometric detection

Hintersteiner

Reisinger

Himmelsbach

et al. 2016

J of Separation Science

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Hindered amine light stabilizers are an important class of stabilizers that protect synthetic polymers from degradation and thus from changing mechanical and optical properties. The current study presents an HPLC method capable of separating oligomeric hindered amine light stabilizers on a commercially available stationary phase, employing an MS-compatible novel mobile phase. Based on the exact masses observed with Q-TOF-MS, a comprehensive characterization of five different types of oligomeric hindered amine light stabilizers was achieved, leading to structural information not included in the datasheets provided by the suppliers. For the different investigated hindered amine light stabilizers, a number of recurring units up to 17 and a molecular weight of 5200 g/mol were detected. Furthermore, the analysis of stabilizer extracts of processed polypropylene samples containing different types of hindered amine light stabilizers revealed significant differences in the oligomeric pattern between standards and polymer samples. Thus, changes in the analytes' oligomeric pattern resulting from processing or aging of polymer materials can be monitored with the presented method.

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Determination of the polymeric light stabilizer tinuvin 622 in polyolefins

Cited by 8 publications

References 9 publications

The separation and analysis of additives in polymers

The separation and analysis of additives in polymers

Separation and identification of an oligomeric light stabilizer Chimassorb 944 by gradient elution chromatography coupled with matrix-assisted laser desorption/ionization mass spectrometry

Separation and characterization of oligomeric hindered amine light stabilizers using high‐performance liquid chromatography with UV and quadrupole time‐of‐flight mass spectrometric detection

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