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. 10. Increasing the crystallization temperature above the maximum crystal growth rate decreases the density of tie molecules. 11. Number average molar mass is determined indirectly by Gel Permeation Chromatography. 12. Addition of low molar mass molecules increases the viscosity of the polymer solution. EMA 4666C Fall 2004 Exam 1 2
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Student Number:___________________________ Graphical Relationships: A. SHOW ALL EQUATIONS. B. EACH GRAPH SHOULD BE A LINEAR RELATIONSHIP. C. LABEL ALL AXES WITH THE APPROPRIATE UNITS. D. CLEARLY STATE ALL ASSUMPTIONS . 13. Sketch the general features of the storage modulus (E’) a function of temperature for poly(butadiene-block-styrene) copolymer (HINT: ROM). Label the major transition (s) and their magnitude relative to E’ 3 pts 14. Sketch the intrinsic viscosity versus viscosity average molar mass 3 pts EMA 4666C Fall 2004 Exam 1 3
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Fall_2004_EXAM_1 - POLYMER PROCESSING - FALL 2004 EMA 4666C...

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