MFGE 337.HW#6.Polymers.W16 (1)

MFGE 337.HW#6.Polymers.W16 (1) - Assignment#6 MFGE 337...

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Assignment #6 Polymer Structure and Polymer Processing (54 pts total) MFGE 337 Materials & Manufacturing Processes Multiple Choice (1 pt for each answer = 21 pts): 3.1 Viscosity can be defined as the ease with which a fluid flows: (a) true or (b) false? 3.2 A Newtonian fluid is a fluid best defined by which one of the following: (a) its viscosity decreases as shear rate increases, (b) its viscosity decreases as temperature increases, (c) its viscosity increases as shear rate increases, (d) its viscosity increases as temperature increases, (e) its viscosity remains constant as shear rate changes, or (f) its viscosity remains constant as temperature changes? 3.3 Viscoelasticity can be defined as the property of a material that determines the strain it experiences when subjected to combinations of stress and temperature over time: (a) true or (b) false? 8.1 Of the three polymer types, which one is the most important commercially: (a) thermoplastics, (b) thermosets, or (c) elastomers? 8.2 Which one of the three polymer types does not involve cross- linking: (a) thermoplastics, (b) thermosets, or (c) elastomers? 8.3 Which one of the three polymer types involves the greatest amount of cross-linking: (a) elastomers, (b) thermoplastics, or (c) thermosets? 8.4 Which one of the following is the chemical formula for the repeating unit in polyethylene: (a) CH 2 , (b) C 2 H 4 , (c) C 3 H 6 , (d) C 5 H 8 , or (e) C 8 H 8 ? 8.5 Degree of polymerization is which one of the following: (a) average number of mers in the molecule chain; (b) proportion of the monomer that has been polymerized; (c) sum of the molecule weights of the mers in the molecule; or (d) none of the above? 8.6 A branched molecular structure is stronger in the solid state and more viscous in the molten state than a linear structure for the same polymer: (a) true or (b) false?
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  • Spring '14
  • Polymer, MERS, polymer processing, polymer melt

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