EMA6165-Spring-2005-EXAM1

EMA6165-Spring-2005-EXAM1 - POLYMER PHYSICS - Spring 2005...

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Unformatted text preview: POLYMER PHYSICS - Spring 2005 STUDENT UFID#:______________________ EMA 6165 - EXAM I (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. HONOR CODE : We, the members of the University of Florida community, pledge to hold ourselves and our peers to the highest standards of honesty and integrity. Signature:___________________________________________________________ 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(ethylene) 2. poly(bisphenol A ether imide) Ultem 3. poly(hexamethyle ne-adipamide) Nylon 6,6 4. poly(bis phenol A carbonate) 5. poly(methyl methacrylate) 6. poly(dimethyl siloxane) POLYMER PHYSICS - Spring 2004 EMA 6165 - EXAM I 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. The recovery stress of an elastomer tested in tension is controlled by entropy when tested below the Tg.. 8. The root mean square radius of gyration of a freely rotating, freely jointed model of a linear polymer chain scales directly with the molar mass. 9. The light scattering contrast factor is directly proportional to the w-average molar mass of a linear chain at Theta conditions. 10 . The elastic modulus below the Tg of a polymer under tension increases as the density of cross link junctions is decreased. 11 . The mean square end to end distance of a linear polymer increases as the number of cis conformations is increased statistically. 12 . The kinetic energy divided by the mean square end-to-end distance is a measure of the elastic modulus for an ideal elastomer. 2 POLYMER PHYSICS - Spring 2004 EMA 6165 - EXAM I 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....
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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-2005-EXAM1 - POLYMER PHYSICS - Spring 2005...

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