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Analysis of Polybutadiene using Gel Permeation Chromatography

Abstract: Gel Permeation Chromatography (GPC) is an analytical tool used to characterize polymers which are soluble in organic solvents. In general an isocratic pump is sufficient for GPC analysis, however for ease of solvent change and rinsing, a pump with two or more channels would be advantageous. The pump should be able to pump the selected flow rate with a precision of typically < 0.15 %. Solvent degassing is recommended either offline or even better online with vacuum degassing. For high sample throughput the use of an autosampler would be beneficial. The temperature of the column oven needs to be very stable to avoid retention time shift and therefore MW errors—a peltier controlled thermostat is ideal for highest temperature stability especially at and below ambient temperatures For detection a UV detector and/or a refractive index detector can be used. In this example we used both detectors to demonstrate, that results can be quite different, depending on the detection system used.

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