Fall_2007_Exam_2 - POLYMER PROCESSING - FALL 2007 EMA 4666C...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
POLYMER PROCESSING - FALL 2007 PUT NAME ON LAST PAGE and SIGN HONOR CODE EMA 4666C – EXAM 2 STUDENT No.:______________________ 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(ethylene terephthalate) 2. poly(p phenylene amide) Kevlar 3. poly(hexamethylene adipamide) (Nylon 6,6) 4. poly(methyl methacrylate) 5. poly(butadiene) 6. poly(vinyl chloride)
Background image of page 1

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

View Full DocumentRight Arrow Icon
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. HINT: Normally one word can be modified to correct false statements. 7. The breaker plate reduces memory of the polymer extrudate. 8. Die output of a solid annular die increases with the radius to the third power. 9. The cold slug dimension is normally 1.5 times the length of the sprue runner. 10. Increasing the melt temperature relative to the mold temperature decreases the crystal volume fraction of polypropylene injection molded part. 11. A trapezoidal runner cross section is less efficient relative to a round cross section for injection molding a Xenoy resin. 12. Injection molded part shrinkage typically increases as the ram speed is decreased. EMA 4666C Fall 2007 Exam 2 2
Background image of page 2
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 total extruder output versus pressure. State any necessary assumptions to linearize the plot.
Background image of page 3

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

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 07/17/2011 for the course EMA 4666c taught by Professor Brennan during the Spring '08 term at University of Florida.

Page1 / 13

Fall_2007_Exam_2 - POLYMER PROCESSING - FALL 2007 EMA 4666C...

This preview shows document pages 1 - 4. Sign up to view the full document.

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