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仪器网/ 行业应用/ 解决方案/ 用SPEX冷冻研磨机来做低聚受阻胺光稳定剂在聚丙烯前处理

用SPEX冷冻研磨机来做低聚受阻胺光稳定剂在聚丙烯前处理

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A small amount of an oligomeric hindered amine light stabilizer (HALS) (Adekastab LA-68LD) in
polypropylene (PP) materials was directly determined by solid samp领 matrix-assisted laser
desorption/ionization mass spectrometry (MALDI-MS) using an internal standard method. First
the matrix reagent (dithranol), 20 mg, and the empirically selected internal standard, angiotensin I
(MW¼1296.5), 5 mg, were premixed in the solid state. The matrix mixture was then co-ground with
the PP sample containing the HALS in liquid nitrogen using a freezer mill. The powdered sample
mixture was spotted on the sample plate, suspended in ion-exchanged water, dried to adhere on
the plate, and subjected to MALDI-MS. Three series of the HALS components accompanied by the
oxidized species were clearly observed as their molecular ions (M.t) along with that of the internal
standard in the mass spectra. A fairly good linear relationship (R2¼0.9991) with a relative standard
deviation of ca. 11% was observed between the relative peak intensities of the HALS components and
the HALS contents ranging from 0.12.5 wt%, which could be used as the calibration line to determine
the HALS content in PP composites directly by MALDI-MS. The UV-exposed PP composite samples
were evaluated by this method to interpret the photostabilizing action of HALS in the PP materials
based on the observed change in the relative abundances of the original and oxidized HALS
components as a function of UV-exposure time. Copyright # 2006 John Wiley & Sons, Ltd. SPEX6770 全自动冷冻研磨机 SPEX6870 全自动冷冻研磨机 SPEX6970EFM 冷冻研磨机
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