Compounding-Extrusion - EMA 4161C POLYMER PROCESSING...

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EMA 4161C POLYMER PROCESSING COMPOUNDING BY EXTRUSION LABORATORY 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 differential scanning calorimetry as a tool to help determine the effectiveness of this extrusion process for blending polyethylene and polypropylene. MATERIALS: Dow Styron brand polyethylene (PE) pellets and General Electric Lexan brand polypropylene (PP) pellets. EQUIPMENT: A 1 inch diameter KL-100 extruder, a mixer for batching the various compounding mixes Storage bags and electronic balance A uniaxial hot-press apparatus for producing thin films, film mold and calipers A dynamic mechanical spectrometer Safety glasses and heat resistant gloves PREPARATION FOR THE EXPERIMENT: 1. Study chapters 3 and 4 of the text by D.H. Morton-Jones entitled Polymer Processing or any other text which reviews the operation and characteristics of the various types of extruders used for polymer-based product manufacturing. 2 2. Look up the melt flow temperatures for PE and PP and suggest the appropriate processing temperatures for the three barrel zones and two die zones of the extruder. 3. Obtain literature values for the density of the PE and PP homopolymers. (Try Modern Plastics as a first reference for these values 1 ). 4. Estimate the density of the three polyblends based on these literature values using the Rule of Mixtures. PROCEDURE: Week 1 of 2 1. Heat the barrel and die of the extruder to the conditions listed below in Table 1 for the polyethylene sample. Allow the extruder barrel and die to soak at these temperatures for at least ten minutes. Table 1. Suggested temperature profile for the extruder. Sample
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This note was uploaded on 07/17/2011 for the course EMA 4161c taught by Professor Staf during the Fall '10 term at University of Florida.

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Compounding-Extrusion - EMA 4161C POLYMER PROCESSING...

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