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Extraction and Quantification of Polyolefin Additives

Roberson et al. [42] have reported an extrae-tion recovery rate of 90-99% for one-step extrae-tion of PP samples. Desrosiers [23] deseribed extrae-tion and quantification of in-polymer additives from polyolefinic materials. The problems eneountered in the extraction step are release of low-MW waxes or oligomers, and formation of hydrolysis, oxidation and degradation products. Undesirable ehemieal reactions may also take place during the extraetion process. [Pg.613]

Quantitation limits (defined as the monomer concentration necessary to produce a peak at least three times the baseline noise or 3% of full scale) for residual monomers (such as vinylchloride, butadiene, acrylonitrile, styrene and 2-ethylhexylacrylate) as low as 0.05 ppm have been reported for solution headspaee, as eompared to 1 ppm for direct solution injection GC [43], Quantification of volatiles by solid headspaee sampling can be challenging. Solid headspace provides about 10-fold more sensitivity than solution headspace. [Pg.613]

Nielson [28] has compared microwave (MAE) and ultrasonic (US) extraction of HDPE/(BHT, Irganox 1010, Irganox 1076) pellets using cyclohexane/iso-propyl alcohol (IPA) and methylene chloride/IPA mixtures in various ratios. Results are eolleeted in Table 6.14. [Pg.613]

The data reported correspond to an RSD of 1.8% for the three additives over six separate extractions or to an RSD of 1.9% for three separate extractions. The same author [28] has also compared US and MAE for several PP resins that contained a variety of additive packages. The PP formulations consisted of antistats, pigments, fillers, slip agents, and antiox-idants/UV degradants. Table 6.15 shows the MAE recoveries for a selection of additives in four resins. [Pg.613]

Results were also reported for LDPE/erucamide andLDPE/(BHT, BHEB, Isonox 129, Irganox 1010/ 1076) [28]. Similar detailed quantitative reports are rare. The results give a good indication of the expectations of careful quantitative extraction. [Pg.613]


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