Spring 99 EXAM1 - POLYMER PHYSICS - Spring 1999 EMA 6165 -...

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POLYMER PHYSICS - Spring 1999 NAME:___________________________ EMA 6165 - EXAM II STUDENT #:______________________ 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. 1. Draw the repeat units for the following polymers. 2. Indicate the type of polymerization process used to manufacture each of the structures. 3. State the relative Tg and/or Tm for each polymer (24pts) Polymer Structural Repeat Unit (2pt) Tg (1pt) Tm (1pt) a. poly(ethylene) b. poly(styrene) c. poly(isoprene) d. poly(bis phenol A carbonate) e. poly(hexamethyl- ene adipamide) f. poly(ethylene terephthalate) 4. Concepts. Answer the following statements with TRUE or FALSE . If the statement is 1
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POLYMER PHYSICS - Spring 1999 NAME:___________________________ EMA 6165 - EXAM II STUDENT #:______________________ false, state the reason(s). If you believe a statement can be made TRUE by a simple qualifier, then state it clearly. (12 pts) a. The shear modulus is directly proportional to the strain for an ideal elastomer below the Tg. b. The freely jointed, freely rotating model underestimates the radius of gyration of polyethylene by a factor of 3 compared to the freely jointed model. c. The number average molar mass of a polymer is most accurately measured by light scattering.
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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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Spring 99 EXAM1 - POLYMER PHYSICS - Spring 1999 EMA 6165 -...

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