EMA6165-Spring-2007-EXAM3

EMA6165-Spring-2007-EXAM3 - POLYMER PHYSICS - Spring 2007...

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POLYMER PHYSICS - Spring 2007 STUDENT UFID#:_________ ___________ EMA 6165 - EXAM 3 (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 Tg Tm 1. Poly(ethylene) 2. Poly(styrene) 3. Poly(ethylene terephthalate) 4. Poly(phenylene ether imide) (Ultem) 5. Poly(dimethylsiloxane) 6. Poly(hexamethylene adipamide) (Nylon 6,6) 7. Poly(vinyl chloride) 8. Poly(propylene) 9. Poly(methyl methacrylate) 10. Poly(bisphenol A carbonate) 11. Poly(phenyl terepthalamide) Kevlar 12. Poly(ethylene oxide)
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POLYMER PHYSICS - Spring 2007 EMA 6165 - EXAM 3 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) 1. The retractive force of an ideal elastomer is predominantly controlled by the internal energy at extension ratios above ca. 3.0 2. Single chains of an elastomer have a lower modulus for a phantom network compared to a Gaussian like network. 3. Increasing a solvent concentration in an ideal rubber decreases the recovery stress by 3 for a fixed temperature and elongation. 4. The entropy of a chain mixture with a solvent increases with increasing temperature above the UCST. 5. 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. 6. The osmotic pressure equals zero for conditions where the Flory interaction parameter, i.e., chi, equals 3/2. 2
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POLYMER PHYSICS - Spring 2007 EMA 6165 - EXAM 3 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.
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This note was uploaded on 07/20/2011 for the course EMA 6165 taught by Professor Brennan during the Spring '08 term at University of Florida.

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EMA6165-Spring-2007-EXAM3 - POLYMER PHYSICS - Spring 2007...

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