Analysis of Photostabilizer in High Density Polyethylene by Reverse-and Normal-Phase HPLC

Cáceres, Ana; Ysambertt, Fredy; López, J.; Márquez, Nelson

doi:10.1080/01496399608001047

Cited by 23 publications

(13 citation statements)

References 13 publications

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“…However, at pH 10 appeared a flattened and broad chromatographic peak at the end of chromatogram. Although the width of this peak was lower than the obtained one by the other authors 15, 16, 19, 21, the shape of peak was not the expected one. At the last tested pH with a value of 11, the retention time of the peak was decreased and its shape was turned around sharp.…”

Section: Resultscontrasting

confidence: 71%

“…The LODs and LOQs of this method were quite lower than those of other before reported chromatographic methods with values between 5–50 and 100 mg/L for LODs and LOQs, respectively 15, 19, 21.…”

Section: Resultscontrasting

confidence: 58%

“…In addition, chromatographic determination of high‐molecular weight (HMW)‐HALS, as Chimassorb 944, was more problematic than one of the monomeric stabilizers 20. In the 1990s, LC separations of Chimassorb 944 from other HALS additives were developed by size exclusion non‐aqueous LC with UV‐visible (UV/Vis) spectrophotometry detection ((gel permeation chromatography)HPLC‐UV/Vis) system 15, 16 and normal‐phase HPLC‐UV/Vis system 21. Although the gel permeation chromatography technique turned out to be very useful to separate compound of different molecular mass, the structure of this (HMW‐)HALS led to unsatisfactory liquid chromatograms due to its broad molecular weight distribution considered characteristic of polymers.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Liquid chromatographic methods to analyze hindered amines light stabilizers (HALS) levels to improve safety in polyolefins

Noguerol-Cal

López‐Vilariño

Fernández-Martínez³

et al. 2010

J of Separation Science

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A chromatographic method using ultra performance LC with ultraviolet spectrophotometry detection system (UPLC-UV-visible (UV/Vis)) (UPLC, ultra performance LC) was developed to determine Chimassorb 944 and Tinuvin 770, high- and low-molecular mass hindered amine light stabilizers, respectively. The use of a bridge ethylene hybrid-based particles C(18) UPLC column, being compatible with a buffered mobile phase adjusted to pH 11.5, was used to achieve a satisfactory elution of possible non-ionizated units of polymeric Chimassorb 944. In addition, a HPLC with positive ion mode ESI and hybrid linear ion trap (LTQ) Fourier transform (FT) Orbitrap MS detection system (HPLC-UV/Vis-ESI-LTQ(FT)Orbitrap) was used for screening and identification purposes. Reliable determinations of monomeric units of Chimassorb 944 and molecule of Tinuvin 770 were achieved by HPLC-ESI(+)-LTQ FT Orbitrap MS method using scan mode. Quality parameters of UPLC-UV/Vis method were evaluated. Obtained LODs and LOQs were 3.41 and 11.4 mg/L for Tinuvin 770 and 0.83 and 2.78 mg/L for Chimassorb 944, respectively. Satisfactory quality parameters of this chromatography method provided the chance to count on a good tool to know the compliance with legal requirements.

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Section: Resultscontrasting

confidence: 71%

Section: Resultscontrasting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Liquid chromatographic methods to analyze hindered amines light stabilizers (HALS) levels to improve safety in polyolefins

Noguerol-Cal

López‐Vilariño

Fernández-Martínez³

et al. 2010

J of Separation Science

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“…Supercritical fluid chromatography has also been applied to the determination of polymer additives (Raynor et al 1988;Carrott 1998). The most widely used technique for determination of non-volatile additives is high performance liquid chromatography (HPLC) with UV detection (Lichtenthaler and Ranfelt 1978;Haney and Dark 1980;Schabron and Fenska 1980;Hodgeman 1981;Perlstein 1983;Munteanu et al 1987;Freitag 1988;Caceres et al 1996;Smith and Taylor 2002).…”

Section: Introductionmentioning

confidence: 99%

Determination of Chimassorb 944 in Polypropylene Geotextiles by HPLC-UV

et al. 2011

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This paper reports the development of a method for the determination of Chimassorb 944 (C944), in polypropylene geotextiles, by high performance liquid chromatography with ultraviolet detection. The C944 was removed from the geotextiles by an ultrasonic extraction and then separated in a NH 2 column, followed by UV detection at 244 nm. Analytical validation showed that the method is accurate and precise. The developed methodology was applied for the determination of C944 in geotextiles exposed to artificial UV radiation and to natural weathering. To the best of our knowledge, this is the first method proposed for the determination of C944 in geotextiles.

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“…1,2 HALSs in polymer materials have been generally analyzed by means of gas chromatography (GC) or liquid chromatography (LC) after their extraction from the substrate materials. 3,4 However, the extraction process is often tedious and time-consuming especially for the oligomeric or polymeric HALSs, which are often employed in practical use because the amount that bleeds out from the substrate materials is low. Moreover, the quantitative recovery of the higher molecular weight components in the HALS is not thoroughly attained by ordinary solvent extraction because of their lower solubility and possible decomposition during the extraction process.…”

Section: Introductionmentioning

confidence: 99%

Determination of Polymeric Hindered Amine Light Stabilizer in Polypropylene Frmuated with Magnesium Hydroxide Flame Retardant by Reactive Thermal Desorption-Gas Chromatography

et al. 2004

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However, the extraction process is often tedious and time-consuming especially for the oligomeric or polymeric HALSs, which are often employed in practical use because the amount that bleeds out from the substrate materials is low. Moreover, the quantitative recovery of the higher molecular weight components in the HALS is not thoroughly attained by ordinary solvent extraction because of their lower solubility and possible decomposition during the extraction process.Recently, the authors have developed a novel method to determine a polymeric HALS in polypropylene (PP) materials using reactive thermal desorption-gas chromatography (RTD-GC) in the presence of an organic alkali, tetramethylammonium hydroxide [(CH3)4NOH, TMAH]. 5,6 This technique allowed the rapid and highly sensitive determination of the polymeric HALS in the PP samples on the basis of its methylated fragments in the resulting chromatograms without using any sample pretreatment such as solvent extraction and subsequent derivatization.Meanwhile, polymer materials in practical uses are generally formulated with a variety of additives and ingredients as well as HALSs. For example, flame retardant is one of the most important additives for various polymer products. Until now, halogenated flame retardants have been widely used because of their extremely high flame retardancy.However, the formulations of these retardants might cause the formation of toxic compounds such as dioxin relatives during combustion. 7 Therefore, various non-halogenated flame retardants have been used for polymer materials in recent years. 8 Among these, the metal hydroxide flame retardants are added to polymer substrates in large quantities (∼60 wt%) to exert the sufficient flame retardancy. As for the polymer samples formulated both with HALS and the considerable amounts of the inorganic flame retardant, the RTD-GC process of the occluded HALS components could be appreciably affected by some catalytic action induced by the metal hydroxide. In this work, the change in the RTD behavior of a polymeric HALS, Tinuvin 622, caused A polymeric hindered amine light stabilizer (HALS), Tinuvin 622 (MW 4000), in PP materials formulated with a magnesium hydroxide flame retardant was determined by reactive thermal desorption (RTD) gas chromatography (GC). Two kinds of the HALS components that were formed through the RTD in the presence of tetramethylammonium hydroxide [(CH3)4NOH, TMAH] were clearly observed in the chromatograms of the PP samples, with negligible interference from the other additives and the PP substrate. Here, the coexisting flame retardant was proved to affect significantly the RTD process of the occluded HALS. As a result, the recovery of the HALS components in the RTD-GC chromatograms of the PP samples increased with increase in the content of the flame retardant. This enhancement of the HALS recovery is attributed mainly to the preferential exposure of the HALS on the surface of the ground PP sample through the interaction between the polymeric HALS and the flame retarda...

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Analysis of Photostabilizer in High Density Polyethylene by Reverse-and Normal-Phase HPLC

Cited by 23 publications

References 13 publications

Liquid chromatographic methods to analyze hindered amines light stabilizers (HALS) levels to improve safety in polyolefins

Liquid chromatographic methods to analyze hindered amines light stabilizers (HALS) levels to improve safety in polyolefins

Determination of Chimassorb 944 in Polypropylene Geotextiles by HPLC-UV

Determination of Polymeric Hindered Amine Light Stabilizer in Polypropylene Frmuated with Magnesium Hydroxide Flame Retardant by Reactive Thermal Desorption-Gas Chromatography

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