Analysis of low molecular weight constituents of polypropylene and other polymeric materials using on‐line SFE‐SFC

Abstract

SummaryAdditives and oligomers from polymers were quantitatively extracted and separated using on-line SFE and capillary SFC. Conditions were found which extracted the additives selectively molecular mass, non-volatile compounds [17][18][19][20][21]. Capillary SFC has been particularly applicable because of the high resolution available.and separated them from the co-extracted oligomers.

Rate and extent of supercritical fluid extraction of additives from polypropylene: Diffusion, solubility, and matrix effects

“…The effect of flow rate was investigated by extracting the ground polypropylene at 100,200,300, and 400 atm, using different flow rates for each pressure at 50°C and for 30 min. Using a flow rate of 7 cm-' and a pressure of 400 atm, 30 min extractions were performed at different temperatures between 20 and 190°C. For the higher temperature extractions, a 50 pm i.d.…”

“…In another study, Chiou et al 36 found the Tg of PET to be depressed by 52°C when CO, was sorbed as 20 atm. Whether the T, is lowered by the plasticization in a semicrystalline polymer is debatable, but the phenomenon may occur during the extraction at temperatures slightly below the true T,.…”

Optimization of experimental parameters for the quantification of polymer additives using SFE/HPLC

“…Good results from the use of on-line SFE/ SFC 12,13 and also off-line SFE in combination with SFC 14 for extraction of antioxidants from a polypropylene matrix have been reported. Cotton et al 13 used the relative peak areas to confirm quantitative results; they claimed that because the relative peak areas for all antioxidants corresponded well with actual concentrations, they had reached quantitative recovery.…”

“…11 The aim of this article is to develop an efficient, rapid method for the quantitative analysis of antioxidants in polypropylene. Although earlier studies [12][13][14][15][16] on the extraction of antioxidants from a polypropylene matrix show promising results, there is a lack of results showing quantitative recovery using short extraction times.…”

“…Cotton et al 13 used the relative peak areas to confirm quantitative results; they claimed that because the relative peak areas for all antioxidants corresponded well with actual concentrations, they had reached quantitative recovery. High recoveries have also been reported by Cotton et al 14 in a later study, but for reaching almost 100% recovery, the extraction time needed was 5 hours.…”