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4666GPC.LAB - EMA 4666C POLYMER PROCESSING LABORATORY...

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EMA 4666C POLYMER PROCESSING LABORATORY EXPERIMENT 1 - MOLAR MASS DETERMINATION PURPOSE: To learn the method of characterization of molar mass known as size exclusion chromatography (SEC) or gel permeation chromatography (GPC). MATERIALS: 1 gram of commercial grade poly(styrene) Poly(styrene) standards (~1 x 10 4 g/mol, 1 x 10 5 g/mol, 1 x 10 6 g/mol) 4 liters of tetrahydrofuran (HPLC grade) 0.5 micron Millipore filter and filter housing 5 sample vials, caps and seals 25 ml flask 10 ml graduated cylinder EQUIPMENT: Linear GPC column (5 x 10 3 g/mol to 1 x 10 6 g/mol) HPLC Chromatograph Differential Refractometer Autoinjector Millenium Software or equivalent Electronic balance Magnetic stirring bar and stirrer Personal computer PROCEDURE: 1. Dry the 1 gram of polymer sample to be analyzed at 80 ° C for 1 hour at 26 in Hg. The manufacturer's recommended drying procedure should be determined and followed if it differs. 2. Carefully place the magnetic stir bar in the flask. Weigh 0.1 gm sample to the nearest milligram into the flask and transfer to the pre weighed flask.
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