Fall 2004 EXAM 1 - POLYMER PROCESSING FALL 2004 EMA 4666C...

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POLYMER PROCESSING - FALL 2004 NAME: PUT ON LAST PAGE and SIGN HONOR CODE EMA 4666C – EXAM 1 STUDENT #:______________________ INSTRUCTIONS: Read the entire exam carefully . Answer every question to the best of your ability, based upon the available information. State all assumptions in answers. SECTION I: Polymer Structures/Properties. (2 pts each/12 pts total) 1. Draw the structural repeat units for the following polymers. 2. Indicate the type of polymerization process used to synthesize each of the structures, i.e.  condensation, addition, ring opening. 3. State the relative Tg and/or Tm for each polymer.  If a Tm is not expected indicate by NA.   Polymer Structural Repeat Unit Process Tg Tm 1. poly(butadiene) 2. poly(ethylene terephthalate) 3. poly(caprolactamide) (Nylon 6) 4. poly(propylene) 5. poly(ethylene) 6. poly(dimethylsiloxane)
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Student Number:___________________________ Concepts. (2pts ea/12pts total) 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.  7 . The   Tg   is   a   pseudo   second   order   thermodynamic   transition   that   correlates   to   a  discontinuity in the specific volume as a function of temperature. 8 . Polymer chain configuration can be changed by rotation of the main bonds that define the  backbone. 9 . The PDI is the ratio of the number average molar mass to the z-average molar mass. 1 0 . Increasing   the   crystallization   temperature   above   the   maximum   crystal   growth   rate  decreases the density of tie molecules. 1 1 . Number average molar mass is determined indirectly by Gel Permeation Chromatography. EMA 4666C Fall 2004 Exam 1 2
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Student Number:___________________________ 1 2 . Addition of low molar mass molecules increases the viscosity of the polymer solution.
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