CHEMICAL ENGINEERING 445/545 Polymer Engineering and Science

UO/MSI CH 668 Polymer Thermal, Molecular, and Rheological Characterization (Summer 2017)

Name ______

Knowledge Survey

Rank Knowledge : 0 (never seen) 1 (seen before) 2 (pretty familiar) 3 (know well)

General Polymer Rank a) homopolymer vs block copolymer b) thermoplastic vs thermoset c) entanglement vs crosslink d) semi-crystalline vs amorphous polymers e) isotactic vs atactic polymer backbone configuration f) differentiate between a crosslink and an entanglement. g) approximate density and molecular architecture of HDPE vs LDPE vs LLDPE. h) difference in mechanical properties between atactic and isotactic polypropylene. i) polymerization techniques – condensation (step-growth), free radical (addition), etc. j) plastics recycling - BIG SIX (plus 7) polymers -- name and recycling code. k) Differential Scanning Calorimetry (DSC) l) TGA – Thermogravimetric Analysis m) Can you sketch the the DSC curves for all the BIG SIX commercial plastics? n) what is the chemical name and repeat unit of SILLY PUTTY?

Dilute Solution Properties of Polymers Rank a) Using schematic diagrams, depict the following states of solution: dilute, semi-dilute, and concentrated. b) What is c* and what is the significance of c* to the state of solution? c) How would one obtain an estimate of c* for a given polymer/solvent system. d) What is the Mark-Houwink-Sakurada equation. Give the MHS relationship. e) How can the MHS be used to determine polymer/solvent interactions (solvent quality). f) For a given polymer sample (MW and MWD specified), what would be the relationship of c* (theta solvent) to c* (good solvent)? g) Draw a picture showing the radius of gyration for a polymer in a theta and good solvent. h) what method would you use to determine each of the following molecular weights: Mw, Mn, Mv, i) How would you determine the Molecular Weight Distribution (MWD) of a polymer? j) show the relationship of Mw, Mn, Mv, and Mz on a MWD curve. k) define GPC and briefly explain the physical principles involved in this technique.

Molecular Rheology Rank a) Sketch a plot of zero shear viscosity vs. MW for polymer melts. b) Define the Deborah (De) and Weissenberg (We) numbers and their significance to polymer flow behavior (e.g., at what value of De (We) would you expect "die swell" or "rod climbing" effects? c) Sketch a plot of modulus vs. time for Silly Putty and indicate the regions of the flow curve which correspond to the various properties of Silly Putty at room temperature. d) Qualitatively describe deGennes's theory of Reptation for entangled polymer melts.

Flow Behavior -- Constitutive Equations for Fluids Rank Write the constitutive equation that describes the fluid behavior for a) Newtonian fluid b) Bingham Fluid (Newtonian) c) Bingham Plastic (non-Newtonian, shear-thinning) d) Power-Law Fluid (shear-thinning and shear-thickening) Sketch the shear stress vs. shear rate curves for the following fluids. a) Newtonian fluid b) Bingham Fluid (Newtonian) c) Bingham Plastic (non-Newtonian, shear-thinning) d) Power-Law Fluid (shear-thinning and shear-thickening)

Rheology - Viscoelastic Fluids Rank a) What is the basic difference between a non-Newtonian and a viscoelastic fluid b) What is the difference between dynamic mechanical and steady shear testing. c) What are the dynamic viscous (G’) and elastic (G”) moduli. d) How are the moduli (G’, G’’) measured. e) What is the definition of the linear viscoelastic flow region?

Polymer Processing Rank Are you familiar with the following polymer processing techniques: a) extruders b) injection molding c) blow molding d) fiber spinning e) film blowing f) film extrusion g) calendering h) thermoforming

List the MAJOR TOPICS that you have NOT covered in your previous UO MSI Polymer Courses that you would like to see covered