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23-Chem-B8 Polymer Engineering: May 2016

Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)

  1. Question 1 Emulsion Polymerization of MMA — Number-Average Molecular Weight
  2. Question 2 Two-Layer Tube Flow — Newtonian Core and Power-Law Annulus
  3. Question 3 Membrane Osmometry — M̄ n and Second Virial Coefficient
  4. Question 4 Polyethylene Grades — HDPE, LDPE, LLDPE
  5. Question 5 Nylon 6,6 Fibre Spinning — Stretch Rate, Stress and Draw Force
  6. Question 6 Linear Viscoelasticity — η 0 , J e 0 and Longest Relaxation Time

Start with Question 1 →

Paper format: Open-book, 3 hours; six numbered problems of equal value (20 marks each), of which five constitute a complete paper (only the first five in the answer book are marked). All six problems are solved below so the set is complete for study.

Reference texts: Odian, Principles of Polymerization (4th ed., Wiley) — chain- and step-growth kinetics, emulsion polymerization, molecular-weight distributions; Rudin & Choi, The Elements of Polymer Science and Engineering (3rd ed., Academic Press) — dilute-solution properties, osmometry, viscoelasticity; Sperling, Introduction to Physical Polymer Science (4th ed., Wiley) — linear viscoelasticity, terminal-zone moduli; Bird, Armstrong & Hassager, Dynamics of Polymeric Liquids, Vol. 1 — non-Newtonian tube flow; supporting polyolefin process detail from Young & Lovell, Introduction to Polymers (3rd ed.).