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Fall_2001_EXAM_2 - POLYMER PROCESSING FALL 2001 EMA 4666C...

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POLYMER PROCESSING - FALL 2001 NAME:PUT ON LAST PAGE and SIGN HONOR CODE EMA 4666C - 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. SECTION I: Polymer Structures/Properties. 1. Draw the structural repeat units for the following polymers. 2. Indicate the type of polymerization process used to synthesize each of the structures. 3. State the relative Tg and/or Tm for each polymer (24pts) Polymer Structural Repeat Unit Process Tg Tm a. poly(ethylene) b. poly(butadiene) c. Nylon 6 (polycaprolactamide) d. poly(phenylene oxide) e. poly(methyl methacrylate) f. poly(vinyl chloride)
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Student Number:___________________________ 4. 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. (12 pts) a. The melting temperature of a single crystal of polyethylene of a defined molar mass is dependent upon time of crystallization. b. The tensile modulus of an extruded polyamide is independent of the die temperature and time to crystallization temperature. c. Crystallization of a polymer from a melt resembles a spinodal phase separation process.. d. The MFI (melt flow index) is inversely proportional to the viscosity of the polymer melt.
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