Manual of Plastics Analysis

Crompton, T. R.

doi:10.1007/978-1-4899-1403-3

Cited by 10 publications

(2 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As was expected, the relative peak intensity of the hydrolyzed product d 1 (]) increased with the increase in irradiation time whereas that of the main component b 1 (b) gradually decreased through oxidation and hydrolysis. It is interesting to note, however, that the intensity of one of the original major HALS components a 1 (2) with a methoxy end group also slightly increased with UV exposure although the other component c 1 (9) did not. This result suggests that the component a 1 might be produced to some extent by UV irradiation through the decomposition of larger HALS components.…”

Section: Resultsmentioning

confidence: 98%

“…HALSs in polymer materials have been generally analyzed by means of gas chromatography (GC) or liquid chromatography after their extraction from the substrate materials. [8][9][10][11][12][13] However, the extraction process is sometimes troublesome especially for the oligomeric or polymeric HALSs, which are often employed in practical use because of their lower migration out from the substrate materials. 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.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Direct Analysis of an Oligomeric Hindered Amine Light Stabilizer in Polypropylene Materials by MALDI-MS Using a Solid Sampling Technique To Study Its Photostabilizing Action

et al. 2003

View full text Add to dashboard Cite

A novel method for the direct analysis of small amounts of an oligomeric hindered amine light stabilizer (HALS) occluded in polypropylene (PP) material was developed to study its photostabilizing action on the basis of matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) using a solid sampling technique while avoiding troublesome solvent extraction. In this sampling protocol, the powdered mixture of PP composite sample containing trace amounts of an oligomeric HALS, Adekastab LA-68LD (MW = 1900), and the matrix reagent (dithranol) was spotted on the sample plate, then ion exchanged water was deposited onto the mixture to make a suspension, and finally, the dried mixture adhered on the plate was subjected to MALDI-MS measurement. On the mass spectrum thus obtained by the solid sampling MALDI, the molecular ions of the HALS desorbed from the PP composite were clearly observed as three major series of the HALS components in the range up to about m/z 7000 with little interference by the PP substrate and the other additives. Moreover, in the MALDI-MS spectra for the UV-exposed sample, the satellite peaks around the major HALS components proved to enhance significantly, reflecting the oxidized HALS species at the tetramethylpiperidine units to cause the photostabilizing action. In addition, hydrolyzed HALS species were also observed for the irradiated sample. These results suggest that not only the oxidation reaction but also the hydrolysis or decomposition of the oligomeric HALS components competitively proceed in the PP composites during UV exposure.

show abstract

Section: Resultsmentioning

confidence: 98%

mentioning

confidence: 99%