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Unformatted text preview: POLYMER PHYSICS - Spring 2003 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. • Draw the repeat units for the following polymers. • State the relative Tg and/or Tm for each polymer (24pts) Polymer Structural Repeat Unit (2pt) Tg (1pt) Tm (1pt) 1. poly(para- phenylene terephthalamide) Kevlar 2. poly( 1,4- butadiene) 3. poly(isoprene) 4. poly(methyl methacrylate) 5. poly(ethylene terephthalate) 6. poly(dimethyl siloxane) POLYMER PHYSICS - Spring 2003 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. Starting at the UCST, quenching a polymer-polymer solution to 5 degrees below UCST will have a larger domain size for polymer one than the same solution quenched 20 degrees below the UCST. 8. The partial of the Gibbs Free Energy with respect to mole fraction of solute defines the critical concentration for phase mixing of a polymer solution. 9. Spinodal phase separation processes are characterized by instantaneous precipitation with small fluctuations in the electron density initially. 10 . The tan delta of a polymer increases at the glass transition with increasing frequency of the input strain amplitude....
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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.
- Spring '08