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23-Chem-B8 Polymer Engineering: December 2014

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

  1. Question 1 Viscosity-average molecular weight from dilute-solution viscometry
  2. Question 2 Number-average molecular weight from osmometry
  3. Question 3 Molecular weight vs. monomer conversion (constant-initiator free-radical polymerization)
  4. Question 4 Step-growth kinetics — Nylon-12 (A–B monomer) vs. Nylon-6,6 (A–A + B–B)
  5. Question 5 Creep of a standard-linear-solid model (Kelvin–Voigt in series with a spring)
  6. Question 6 Constant-rate extension of Maxwell and Kelvin–Voigt materials
  7. Question 7 Short-answer set — mechanism, crystallinity, pressure effects, stiffening PE

Start with Question 1 →

National Exam 04-Chem-B8, Polymer Engineering — December 2014. Three hours, OPEN BOOK (any non-communicating calculator). The paper is in four parts: Part A (Q1–2, 20 marks each), Part B (Q3–4, 30 marks each), Part C (Q5–6, 30 marks each) and Part D (Q7, 20 marks). A candidate answers ONE question from each of A, B, C and the single question in D — four questions constitute a complete paper. For completeness this solution works all seven questions in full.

Reference texts: Rudin & Choi, The Elements of Polymer Science and Engineering, 3rd ed.; Sperling, Introduction to Physical Polymer Science, 4th ed.; Odian, Principles of Polymerization, 4th ed.; Young & Lovell, Introduction to Polymers, 3rd ed.; Painter & Coleman, Fundamentals of Polymer Science, 2nd ed.