Fall_2005_Exam_1 - POLYMER PROCESSING FALL 2005 EMA 4666C...

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POLYMER PROCESSING - FALL 2005 NAME: PUT ON LAST PAGE and SIGN HONOR CODE EMA 4666C – EXAM 1 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(ethylene) 2. poly(dimethylsiloxane) 3. poly(hexamethylene) (Nylon 6,6) 4. poly(propylene) 5. poly(styrene) 6. poly(methyl methacrylate)
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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. 7. The glassy modulus of an semi-crystalline is approximately 3GPa at temperatures ca. 50 ° C. 8. Polymer chain diffusion begins before the yield point in a amorphous polymer subjected to an applied stress in a tensile test at a temperature above the Tg. 9. The number average molar mass of an addition polymer, i.e., polyethylene, is typically around 30 kg/mol for commercial applications such as blow molded bottles. 10. The consistency index for a Newtonian polymer is typically equal to 3.4. 11. The Reynolds number exceeds 2100 for a turbulent fluid. 12. The Deborah number is a direct ratio of the experimental time to the characteristic time of the polymer chain. EMA 4666C Fall 2005 Exam 1 2
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