CRYSTEX QC is based on the Temperature Rising Elution Fractionation (TREF) technique, performed in a two-step cycle to separate the soluble fraction from the crystalline matrix and analyze them independently.
The sample in either powder or pellet form is completely dissolved in the oven and an aliquot is loaded first to the column and then to the IR detector and viscometer to measure the values of Ethylene Content and Intrinsic Viscosity in the whole sample. A new load of solution is injected into the column, and while it’s there, the temperature is lowered to separate the amorphous fraction from the crystalline matrix. Once they’re separated, the soluble fraction is flushed out of the column and sent to the detectors to measure its values.
Finally, a high-temperature re-dissolution cycle is performed for the analysis of the crystalline fraction that was left in the column.
This technique not only measures the amount of soluble fraction, but it also allows the analysis of each part of the sample separately, obtaining the content of ethylene and intrinsic viscosity for all three parts of the sample.
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