NivaarExam Prep

23-Chem-B8 Polymer Engineering

Worked solutions to 4 past sittings (2014–2017), 25 questions. Pick a sitting, or start from a topic below.

Topics across the sittings

Topics that come up in more than one sitting, taken from the headings of our worked solutions. A topic counts once per sitting.

Questions by sitting

May 2017

  1. Question 1: Non-Newtonian Viscosity of a CMC Solution from Capillary Data
  2. Question 2: Living Anionic Polymerization — Chain Lengths and Poisson Kinetics
  3. Question 3: Molecular-Weight Averages and Variance from Fractionation
  4. Question 4: Design Procedure for an Inverted-L Calender (PVC Film)
  5. Question 5: Injection of a Power-Law Melt into a Runner
  6. Question 6: Control of Copolymer Composition in a Semi-Batch Reactor

May 2016

  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

December 2015

  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

December 2014

  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