EMA6165-Spring-2007-EXAM2

EMA6165-Spring-2007-EXAM2 - POLYMER PHYSICS Spring 2007 EMA...

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POLYMER PHYSICS - Spring 2007 STUDENT UFID#:_________ ___________ EMA 6165 - EXAM 2 (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 used to answer/solve each exam question. 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 (24pts) Polymer Polymerization Mechanism (2pt) T g (1pt) T m (1pt) 1. poly(propylene) 2. poly(arylene ethylene imide) 3. Nylon 6,6 4. poly(phenyl terepthalamide) (Kevlar) 5. poly(ethylene terephthlate) 6. poly(bisphenol A carbonate) (Lexan)
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POLYMER PHYSICS - Spring 2007 EMA 6165 - EXAM 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 second virial coefficient equals zero at a chi value of 3/2. 10. The chi parameter is temperature independent. 11. The chain radius of gyration increased with evaporation of the solvent from the SEBS triblock copolymer spread on a surface (Wang et al, Langmuir 2007 –hmwk assignment) 12. The restorative force of an ideal elastomer scales with the extension (length) of the polymer (Helmhotz) 2
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POLYMER PHYSICS - Spring 2007 EMA 6165 - EXAM 2 II. Graphical Relationships: You must provide the appropriate equations for answering each question. You must label axes appropriately and provide appropriate units and orders of magnitude. STATE ALL ASSUMPTIONS required. SHOW ALL Equations required. It is preferred that the relationships are linearized. 13. Chi parameter versus molar mass (state assumptions and show all equations) (4pts) 14. Chi parameter versus chain concentration (state assumptions clearly) (4pts) 3
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POLYMER PHYSICS - Spring 2007 EMA 6165 - EXAM 2 15. Chain characteristic ratio versus chain molar mass (4pts) 16. Sketch the Number average mean square end to end distance versus the Weight average mean square end to end distance of chains in polymer fractions separated by GPC (Assume a PDI = 2.0) (4pts) 4
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EMA6165-Spring-2007-EXAM2 - POLYMER PHYSICS Spring 2007 EMA...

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