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The on-line coupling of gel permeation chromatography (GPC) and 1 H NMR operating at temperatures up to 130°C is presented. A NMR flow probe with a cell volume of 120μL and a stop-flow valve are developed for on-flow and stop-flow NMR measurements at high temperatures. To maintain high and constant temperatures through the whole probe, the flow probe contains two separate heating circuits...
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