Fall_2009_Exam2_ver_a

Fall_2009_Exam2_ver_a - POLYMER PROCESSING - FALL 2009...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: POLYMER PROCESSING - FALL 2009 NAME: PUT ON LAST PAGE and SIGN HONOR CODE EMA 4161C Exam 2 STUDENT #:______________________ EMA 4161C Fall 2009 Exam 2 ver a 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. (4 pts each/24 pts total) 1. Indicate the type of polymerization process used to synthesize each of the structures, i.e. condensation, addition, ring opening. 2. State the relative Tg and/or Tm for each polymer. If either are not measurable indicate by NA. Polymer Repeat Unit Structure Process Tg Tm 1. Poly(vinyl chloride) 2. poly(caprolactone) (Nylon 6) 3. Poly(ethylene oxide) 4. Poly(bisphenol A ether imide) Ultem 5. Poly(methyl methacrylate) 6. Poly(ethylene) Student Number:___________________________ EMA 4161C Fall 2009 Exam 2 ver a 2 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. HINT: Normally one word can be modified to correct false statements. 7. Birefringence is a measure of the addition of the refractive index of the primary axis of orientation of crystals and the refractive index in the transverse direction 8. The Reynolds number is directly proportional the melt velocity raised to the second power. 9. Die output scales directly with the flight angle of the extruder screw. 10. Pressure flow through a channel of fixed dimensions scales directly with the strain rate of a newtonian fluid. 11. The breaker plate eliminates memory into the polymer extrudate. 12. Die output for a tube on an extruder is directly proportional to the diameter raised to the first power. Section III: Graphical Relationships (NEXT PAGE): A. SHOW ALL EQUATIONS. B. IF POSSIBLE, REPRESENT EACH GRAPH AS A LINEAR RELATIONSHIP. C. LABEL ALL AXES WITH THE APPROPRIATE UNITS AND CRITICAL TRANSITIONS. D. CLEARLY STATE ANY/ALL ASSUMPTIONS. Student Number:___________________________ EMA 4161C Fall 2009 Exam 2 ver a 3 13. Sketch the relationship between the die output and the molar mass of the melt 4 pts 14. Sketch the drag flow output as a function of the diameter of the screw. 4 pts Student Number:___________________________ EMA 4161C Fall 2009 Exam 2 ver a 4 SECTION IV: Definitions/Concepts. SECTION IV: Definitions/Concepts....
View Full Document

Page1 / 11

Fall_2009_Exam2_ver_a - POLYMER PROCESSING - FALL 2009...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online