Update: 28 September, 2023
This document presents a repeatability study of polypropylene analysis using Agilent PLgel MIXED-B columns and the Agilent PL-GPC 220 integrated, high temperature instrument. The system's ability is demonstrated through the analysis of six polypropylene injections. A commercial sample of polypropylene was prepared at 1.5 mg/mL using the PL-SP 260 sample preparation system with a dissolution temperature of 160 °C and a dissolution time of two hours. Six aliquots of the master batch solution were dispensed into the PL-GPC 220 autosampler vials and placed in the carousel where the hot zone temperature was 160 °C and the warm zone was 80 °C. Figure 1 shows an overlay of the raw data chromatograms obtained for the six consecutive injections of the sample. The data were analyzed against a polystyrene standards calibration using the provided Mark-Houwink parameters to obtain the polypropylene equivalent molecular weight averages shown in Table 1.
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Publication date: 05 July, 2012
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