EMA6165-Fall_2010_Exam3rev-b

EMA6165-Fall_2010_Exam3rev-b - POLYMER PHYSICAL SCIENCE -...

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Unformatted text preview: POLYMER PHYSICAL SCIENCE - FALL 2010 NAME: PUT ON LAST PAGE and SIGN HONOR CODE EMA 6165 Exam 3 Rev B STUDENT ID NUMBER:______________________ 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/36 pts total) 1. Indicate the tacticity: I isotactic; S-syndiotactic; A-atactic: NA-not applicable. 2. State the relative Tg and/or Tm for each polymer. Indicated if the Tg or Tm are not applicable/measurable by NA. Polymer Tacticity (1 pt) Tg (1 pt) Tm (1 pt) 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) EMA 6165 Fall 2010 Exam 3 ver b Student Number:___________________________ SECTION II: 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. 1 3. The volume fraction of spherulites increases in an injection molded dogbone as the mold temperature is increased. 1 4. The chi parameter is temperature independent. 1 5. Fracture toughness increases with the density of the tie molecules between lamellae. 1 6 The third moment of the molar mass is defined as the Weight Average Molar Mass 1 6. The retractive force of an ideal elastomer is predominantly controlled by the enthalpy at extension ratios below ca. 3.0. 1 7. Drag flow output of an extruder is temperature dependent. EMA 6165 Fall 2010 Exam 3 ver b 2 Student Number:___________________________ Section III: Graphical Relationships (NEXT PAGE): A. SHOW ALL EQUATIONS. B. IF POSSIBLE , REPRESENT EACH GRAPH AS A LINEAR RELATIONSHIP. C. LABEL ALL AXES WITH THE APPROPRIATE UNITS AND CRITICAL TRANSITIONS. D. STATE ANY/ALL ASSUMPTIONS CLEARLY . 18. Growth rate in regime I versus lamellae thickness 3 pts 19. Sketch the relationship between the output rate of a single-screw extruder and the molar mass of the plastic. (Assume drag flow only, non-ram screw design.) 3 pts EMA 6165 Fall 2010 Exam 3 ver b 3 Student Number:___________________________ EMA 6165 Fall 2010 Exam 3 ver b 4 Student Number:___________________________...
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EMA6165-Fall_2010_Exam3rev-b - POLYMER PHYSICAL SCIENCE -...

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