Fall 2005 EXAM 3 - POLYMER PROCESSING - FALL 2005 NAME: PUT...

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Unformatted text preview: POLYMER PROCESSING - FALL 2005 NAME: PUT ON LAST PAGE and SIGN HONOR CODE EMA 4666C EXAM 3 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. (1 pt each/15 pts total) 1. State the relative Tg 2. State the Tm for each polymer. If a Tm is not expected indicate by NA. Polymer Tg Tm 1. poly(ethylene) 2. poly(ethylene terephthalate) 3. poly(carbonate) (bisphenol-A) 4. poly(1,4-butadiene) 5. poly(propylene) 6. poly(methyl methacrylate) 7. poly(vinyl chloride) 8. poly(dimethylsiloxane) 9. poly(styrene) 10 . poly(hexamethylene adipamide) (Nylon 6,6) 11 . poly(caprolactam) (Nylon 6) 12 . poly(terephthalamide) (Kevlar) 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. 1 3 . The volume fraction of spherulites increases in an injection molded dogbone as the mold temperature is increased. 1 4 . Jetting is caused by the mass of the parison exceeding the tensile viscosity in an extrusion blow molded parison. 1 5 . Cooling rate of an injection molded plastic is directly proportional to crystallite volume fraction. 1 6 . A stripper plate removes the sprue from the mold. 1 7 . Cold slug is normally 15 times the diameter of the sprue. 1 8 . RIM requires higher clamp pressure on the mold compared to Injection Molding. EMA 4666C Fall 2005 Exam 3 2 Student Number:___________________________ EMA 4666C Fall 2005 Exam 3 3 Student Number:___________________________ Graphical Relationships (2 pts ea. / 8 pts total): 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 . 19. Sketch the relationship between the injection molding machine nozzle pressure drop per length and the viscosity of the melt. (Assume a Newtonian Fluid Behavior) 2 pts 20. Plot melt viscosity versus shear rate for high density polyethylene. Assume non-Newtonian behavior (i.e. use Power-Law relationship). 2 pts EMA 4666C Fall 2005 Exam 3 4 Student Number:___________________________ 21....
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Fall 2005 EXAM 3 - POLYMER PROCESSING - FALL 2005 NAME: PUT...

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