Fall_2006_Exam_2 - POLYMER PROCESSING - FALL 2006 EMA 4666C...

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POLYMER PROCESSING - FALL 2006 NAME: PUT ON LAST PAGE and SIGN HONOR CODE EMA 4666C – EXAM 2 STUDENT #:______________________ INSTRUCTIONS: Read the entire exam carefully . Answer every question to the best of your ability, based upon the available information. State all assumptions in answers. SECTION I: Polymer Structures/Properties. (2 pts each/12 pts total) 1. Draw the structural repeat units for the following polymers. 2. Indicate the type of polymerization process used to synthesize each of the structures, i.e. condensation, addition, ring opening. 3. State the relative Tg and/or Tm for each polymer. If a Tm is not expected indicate by NA. Polymer Structural Repeat Unit Process Tg Tm 1. poly(methyl methacrylate) 2. poly(bis phenol A carbonate) 3. poly(caprolactam) (Nylon 6) 4. poly(vinyl chloride) 5. poly(propylene) 6. poly(ethylene oxide)
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Student Number:___________________________ Concepts. (2pts ea/12pts total) Answer the following statements with TRUE or FALSE . If the statement is false, state the reason(s). If you believe a statement can be made TRUE by a simple qualifier, then state it clearly. HINT: Normally one word can be modified to correct false statements. 7. Birefringence is a measure of the difference in the refractive index of the primary axis of orientation of crystals and the refractive index in the transverse direction 8. The Reynolds number is directly proportional the melt velocity raised to the second power. 9. The breaker plate induces memory into the polymer extrudate. 10. Die output for a tube on an extruder is directly proportional to the diameter raised to the first power. 11. Die output increases as the flight angle is increased 12. Maximum flow through a channel of fixed dimensions scales inversely with the strain rate of a newtonian fluid. EMA 4666C Fall 2006 Exam 2 2
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Student Number:___________________________ Graphical Relationships: A. SHOW ALL EQUATIONS. B. EACH GRAPH SHOULD BE A LINEAR RELATIONSHIP. C. LABEL ALL AXES WITH THE APPROPRIATE UNITS. D. CLEARLY STATE ALL ASSUMPTIONS. 13. Sketch the general features of the change in pressure versus channel dimensions for a standard extruder screw. State assumptions 3 pts 14.
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Fall_2006_Exam_2 - POLYMER PROCESSING - FALL 2006 EMA 4666C...

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