Compounding by Extrusion 1998

Compounding by Extrusion 1998 - EMA 4666C POLYMER...

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EMA 4666C POLYMER PROCESSING LABORATORY COMPOUNDING BY EXTRUSION PURPOSE: 1. To learn how compounding is performed using an extruder. 2. To utilize compression molding as a tool for facilitating sample preparation. 3. Use dynamic mechanical spectrometry as a tool to help determine how effective this extrusion process is for blending polystyrene and polycarbonate. MATERIALS: Dow Styron brand polystyrene pellets and General Electric Lexan brand polycarbonate pellets. EQUIPMENT: A 1 inch diameter KL-100 extruder A mixer for batching the various compounding mixes Heat resistant gloves for handling the extrudate A uniaxial hot-press apparatus for producing thin films A dynamic mechanical spectrometer Safety glasses for personal protection PROCEDURE: Week 1 of 2 1. Heat the barrel and die of the extruder to the conditions listed below in Table 1 and allow the extruder barrel and die to soak at these temperatures for at least ten minutes after the temperature reaches the desired level. Table 1. Suggested temperature profile for the extruder. Zone 1 Zone 2 Zone 3 Die 1 Die 2 Temperature (°C) 200 220 240 240 240 2. Weigh the appropriate amounts of polystyrene (PS) and polycarbonate (PC) pellets required to produce ca. 800 g batches of each of the following weight percentage polymer: 100% PS 75% PS - 25% PC 50% PS - 50% PC 25% PS - 75% PC 100% PC 3. Mix the PS and PC pellets together using the mixer for ca. 5 min. 4. Begin extrusion at the lowest possible revolutions per minute (rpm) initially . Never
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adjust the motor speed unless the motor is running . Slowly increase the extruder rpm until a setting of 10 rpm is achieved. 5. Pour the 100% PS sample into the extruder hopper. 6. Let the extruder run at least 10 min to reach a steady flow and then measure the mass output of extrudate within a 2 minute time interval. 7. Record the barrel pressure produced by this temperature/rpm combination for the 100% PS sample. 8. After these measurements of the 100% PS batch have been made close the hopper slide-gate, remove the remaining PS pellets, and refill the hopper with the next batch, i.e., the 75% PS-25% PC batch. 9.
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Compounding by Extrusion 1998 - EMA 4666C POLYMER...

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