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Unformatted text preview: POLYMER PHYSICS - Spring 2003 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. 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(styrene) 2. poly( 1,4- butadiene) 3. poly(isoprene) 4. poly(bis phenol A carbonate) 5. poly(ethylene) 6. poly(dimethyl siloxane) POLYMER PHYSICS - Spring 2003 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 Youngs modulus in tension is independent of strain rate for a thermoplastic tested below the Tg.. 8. The freely rotating, freely jointed model underestimates the radius of gyration of poly(1,2-butadiene) by a factor of 3 compared to the freely rotating model (Assume theta conditions). 9. The w-average molar mass of a linear, polymer is most accurately measured by light scattering....
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- Spring '08