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23-Chem-B8 Polymer Engineering: December 2015

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

  1. Question 1 Reversible step-growth polymerization of PET — conversion, chain length, PDI
  2. Question 2 Initiator concentration for a target free-radical conversion
  3. Question 3 Intrinsic viscosity, viscosity-average molecular weight and Huggins constant for PMMA
  4. Question 4 WLF shift — extruder temperature for a lower-molecular-weight batch
  5. Question 5 Film die gap for a two-metering-zone screw extruder
  6. Question 6 Creep–recovery design of a polypropylene water tank

Start with Question 1 →

Paper format: 04-CHEM-B8 Polymer Engineering, December 2015. Open-book, 3 hours, non-communicating calculator, graph paper supplied. Six problems, each worth 25 marks; four problems constitute a complete paper (only the first four in the answer book are marked). For completeness this solution works all six questions in full.

Reference texts: Rudin & Choi, The Elements of Polymer Science and Engineering, 3rd ed.; Odian, Principles of Polymerization, 4th ed.; Sperling, Introduction to Physical Polymer Science, 4th ed.; Young & Lovell, Introduction to Polymers, 3rd ed.; Crawford, Plastics Engineering, 3rd ed. (extrusion & creep).