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EMA6165-Fall-2009-EXAM2-Edge

EMA6165-Fall-2009-EXAM2-Edge - POLYMER PHYSICS Fall...

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POLYMER PHYSICS Fall 2009-Edge STUDENT UFID#:______________________ EMA 6165 - EXAM 2 (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. (20pts) Polymer Polymerization Mechanism (2pt) T g (1pt) T m (1pt) 1. poly(propylene) 2. poly(arylene ether imide) 3. poly(hexamethylene adipamide) 4. poly(butadiene) 5. poly(ethylene) 6. poly(bisphenol A carbonate) Lexan
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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) 7. Spinodal decomposition represents nucleation and growth kinetics of phase segregation. 8. The osmotic pressure of the dissolved polymer chain scales inversely with the hydrodynamic volume of the chain. 9. The chi parameter is temperature independent. 10. The second virial coefficient equals zero at a chi value of 3/2.
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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. 11. 5 Chi parameter versus chain concentration (state assumptions clearly) (6pts) 12. Given a perfectly elastic chain, plot the ultimate stress as a function of the root mean square end to end distance. Show all equations! (6pts)
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POLYMER PHYSICS - Fall 2009-Edge EMA 6165 - EXAM 2 4 SECTION II: Definitions/Concepts: Give a BRIEF description for each of the following terms in the SPACE provided. Use equations or words or figures. 16 pts, 13. Extension Ratio: 14. <Me>: 15. LCST: 16. Isothermal compressibility: 17. SEBS: 18. Characteristic ratio: 19. Creep: 20. Combinatorial Entropy :
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POLYMER PHYSICS - Fall 2009-Edge EMA 6165 - EXAM 2 5 SECTION III: Engineering Problem 21. You are given and semi-interpenetrating network, i.e. a second polymeric network is formed within an existing network. You have to determine if one or both networks are elastomers. Describe the experiments that you would perform and the information you would need to answer the question. REMINDER: You must define the polymers and their differences to answer this question.
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