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EBME 306 EXAM 2 QUESTIONS AND ANSWERS
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EBME 306 EXAM 2 QUESTIONS AND ANSWERS
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Name: Score:57 Multiple choice questions
Definition 1 of 57
modulus, creep, stress relaxation
Scanning Electron Microscopy (SEM)
Polymers rich in hydrophilic groups
Dynamic Mechanical Analyzer (DMA)
Thermogravimetric Analysis (TGA)
Definition 2 of 57
Polymer materials that CROSSLINK
Thermosets do not undergo solid-melt transformation on heating, so they cannot be melted,
dissolved, or reprocessed.
Thermoset Polymers
Addition Polymerization
Living Polymerization
Step Growth Polymerization
Definition 3 of 57
polymer does not follow the force applied to it, but react slowly, or does not return
completely to their original state instantly
Hysteresis
conformation
Thermoset Polymers
Toughness
,Definition 4 of 57
Polymerization Reaction
Monomers and monomer-derived growing chains of every possible length can join with each
other simultaneously to form even longer chains and thereby end up forming polymeric chains
EX: PET
Step Growth Polymerization
Condensation Polymerization
Free Radical Chain Growth
Addition Polymerization
Definition 5 of 57
enhances interaction, thus
enhances ordered polymer packing, thus enhances crystallinity
Chain Growth Polymerization
Scanning Electron Microscopy (SEM)
symmetry in polymer structure
Size of side-groups
Definition 6 of 57
polymer structure contains different repeating units
Homopolymer
Hysteresis
Thermoset Polymers
Heteropolymer
,Definition 7 of 57
More branching causes more free volume and hence decreases Tg but analogous to larger
side-groups can also cause steric hindrance in rotation, thereby increasing Tg; so the effect
varies from polymer to polymer
Below Tg
conformation
Branching
heating
Definition 8 of 57
initial strength (steep modulus) but then undergoes significant deformation and hence shows
variable toughness
Rigid plastics (PS, PMMA, PC) and fibers (nylon, Kevlar)
Chain Growth Polymerization
Flexible plastics (PE, PP)
symmetry in polymer structure
Definition 9 of 57
The geometrical arrangement in a single polymer chain arising from the order/orientation of
atoms determined by chemical bonds. The configuration of a polymer cannot be altered
unless chemical bonds are broken and reformed. Hence configuration is called permanent
stereostructure.
Elongation
configuration
Condensation Polymerization
conformation
, Definition 10 of 57
how well the polymer resists deformation
Homopolymer
Heteropolymer
heating
Modulus
Definition 11 of 57
Measures changes in polymer weight in relation to change in temperature
Provides data for polymer thermal degradation temperature which is important to predict
thermal processing range
Thermoplastic Elastomers
Thermogravimetric Analysis (TGA)
Weight average molecular weight (Mw)
Elastomers (polyisoprene, some PUs)
Definition 12 of 57
shorter length lowers Tg due to more free volume of movement
permanent dipoles
Chain length
Copolymer
Homopolymer
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