EMA6165-Fall-2009-EXAM3-Edge

EMA6165-Fall-2009-EXAM3-Edge - POLYMER PHYSICS Fall...

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Unformatted text preview: POLYMER PHYSICS Fall 2009-Edge STUDENT UFID#:______________________ EMA 6165 - EXAM 3 120 points total (use the NEW UF ID No.) INSTRUCTIONS: Read the entire exam carefully. Answer every question to the best of your ability, based upon the available information. State all assumptions you use in answers. SECTION I: Polymer Structures/Properties. State the polymerization mechanism, i.e., condensation, addition, ring opening. State the relative Tg and/or Tm for each polymer. (48pts) Polymer Polymerization Mechanism (2pt) T g (1pt) T m (1pt) 1. poly(ethylene) 2. poly(dimethylsiloxane) 3. poly(hexamethylene adipamide) 4. poly(butadiene) 5. poly(styrene) 6. poly(methylmethacrylate) 7. poly(vinyl chloride) 8. poly(phenyl terepthalamide) Kevlar 9. poly(arylene ether imide) 10. poly(ethylene terepthalate) 11. poly(ethylene oxide) 12. poly(bisphenol A carbonate) Lexan POLYMER PHYSICS - Fall 2009-Edge EMA 6165 - EXAM 2 2 Concepts. 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. (Normally only a single word change is required.) (12 pts) 13. Increasing a solvent concentration in an ideal rubber increases the recovery stress by a factor of 3 for a fixed temperature and elongation.. 14. The differences in the principle recovery stress of an ideal elastomer scales directly with the square root of the product of the biaxial strains under biaxial loading conditions. 15. The retractive force of an ideal elastomer is predominantly controlled by the entropy at extension ratios above ca. 3.0. 16. The osmotic pressure equals zero for conditions where the Flory interaction parameter, i.e., chi, equals 3/2. 17. The crystal melt temperature is inversely proportional to the crystal stem length for a single crystal of polyethylene. 18. The partial of the Gibbs Free Energy with respect to mole fraction of polymer defines the critical concentration for phase mixing. POLYMER PHYSICS - Fall 2009-Edge EMA 6165 - EXAM 2 3 II. Graphical Relationships: 1. Each plot should be represented as a linear function if possible through algebraic manipulation. 2. You must provide all equations used to create the plot 3. Label all axes appropriately, i.e., provide units and orders of magnitude. 4. STATE ALL ASSUMPTIONS required....
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EMA6165-Fall-2009-EXAM3-Edge - POLYMER PHYSICS Fall...

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