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Test your basic knowledge |
Modern Material Science And Engineering 2
Start Test
Study First
Subject
:
engineering
Instructions:
Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. First step in the process of polymerization - during which a free radical is formed
staggered conformation
block copolymers
initiation
monomers
2. One method of expressing the molecular weight of sample of polymers with averaging based on weight; this method is more useful when large molecules in the sample dominate the behavior
oligomers
coloring agents
weight average molecular weight Mw
High volume thermoplastics HVTP
3. An acid and an alcohol
most common condensation/step- growth polymerization occur between....
propagation
tacticity
coloring agents
4. Process of pushing polymers through a spinneret and winding the solidified fibers onto a tow - which imposes a shear stress on the fibers upstream as they emerge from the spinneret
melt spinning
conformation
free radical
spinneret
5. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
oligomers
extruder
graft copolymers
plasticizers
6. Carbon atom capable of multiple configurations due to four different substituents
secondary bonding
asymetric
number average molecular weight Mn
initiation
7. Covalently bonded chains of molecules with small monomer units repeated from end to end
asymetric
polymers
graft copolymers
random copolymers
8. Formation of side chains along the backbone; presence of branches disrupts the interactions beween adjacent chains; lowering the tensile strength - melting point - stiffness - crystallinity - and density
trans - conformation
branching
rayon
step- growth/condensation polymerization
9. Additives that cause swelling - which allows the polymer chains to slide past one another more easily - making the polymer softer and more pliable. also used to decrease the viscosity of cement paste to make it easier to flow
polyviyl chloride PVC
plasticizers
spinneret
free radical
10. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
polymers
acrylic
dyes
structural unit
11. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
branching
constitution
addition polymerization/chain growth/free- radical polymerization
tacticity
12. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
nylon
constitution
fillers
polymers
13. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
graft copolymers
side groups/ substituents
High volume thermoplastics HVTP
polyesters
14. Atoms attached to the polymer backbone.
polyviyl chloride PVC
trans - conformation
side groups/ substituents
rayon
15. Conformation that occurs when the largest substituent in a molecule are offset by 60
gauche conformation
end groups
thermosets
structural unit
16. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
isotactic dan
polymers
poly- p- phenylene benzobisoxazole PBO
polyamides
17. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
polymethylmethacrylate PMMA
primary termination
plasticizers
tacticity
18. Process used to make thermoset fibers by performing the polymerization reacting in a solbent as the material flows through a spinneret and into a quenching bath
melt spinning
configuration
weight average molecular weight Mw
solution spinning
19. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
functional groups
free radical
end groups
High volume thermoplastics HVTP
20. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
degree of polymerization DPn
plyacrylonitrile PAN
primary termination
injection molding
21. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
number average molecular weight Mn
vinyl monomer
vulcanization
polypphenylene terephyhalamide PPTA
22. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
homopolymer
configuration
tow
constitution
23. Covalent bonding of the polymer backbone and side groups
atactic
graft copolymers
primary bonding
homopolymer
24. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
screen pack
secondary bonding
aramid
number average molecular weight Mn
25. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
termination
additives
isotactic dan
conformation
26. Polymer that is made up a single repeat unit
homopolymer
hopper
plasticizers
propagation
27. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
monomers
functional groups
initiation
random copolymers
28. Term used to represent the average molecular weight of a sample containing a wide range of polymer chain lengths. this term is used to avoid confusion between the number average and the weight molecular average weight
mutual termination
graft copolymers
relative molecular mass RMM
polyviyl chloride PVC
29. Second- order thermodynamic transition in which the onset of large scale chain mobility occures in polymers. Bellow Tg the polymer is glasslike and brittle. above Tg the polymer becomes rubbery and flexible
acrylic
glass transition temperature Tg
degree of polymerization DPn
nylon
30. Primary raw material for most polymers
hopper
melt spinning
petroleum
copolymer
31. Relative configuration of adjecent asymmetric carbons
polypphenylene terephyhalamide PPTA
die
tacticity
termination
32. Formation of a plymer that occurs when two potentially reactive end groups on a polymer react to form a new covalent bond between the polymer chains. this reaction also forms a biproduct - usually water
poly- p- phenylene benzobisoxazole PBO
end groups
condensation/step- growth polymerization
mutual termination
33. Formation of a polymer that occurs when two potentially reactive end groups on a polymer react to form a new covalent bond between the polymer chain. this reaction also forms a byproduct - which is typically water
polyurethanes
step- growth/condensation polymerization
alternating copolymers
trans - conformation
34. Two or more polymers mechanically mixed together but without covalent bonding between them
conformation
High volume thermoplastics HVTP
injection molding
blends
35. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
block copolymers
vulcanization
rayon
acrylic
36. Smallest repeating unit in a polymer. aka repeat unit
structural unit
additives
polymer backbone
secondary bonding
37. Porcess of breaking large organic hydrocarbons into smaller molecules
isotactic dan
secondary bonding
constitution
cracking
38. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
polyviyl chloride PVC
alternating copolymers
coloring agents
end groups
39. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
additives
functionality
oligomers
freeze line
40. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
blends
primary bonding
thermosets
fillers
41. Pigments or dyes that change the way light is absorbed or reflected by a polymer
relative molecular mass RMM
polyamides
coloring agents
polyesters
42. Coloring agents that do not dissolve into the polymer
thermosets
pigments
fillers
spinneret
43. Part of the extrusion apparatus that contains a heated screw which is used to melt the polymer and the polymer forward into the next chamber
configuration
most common condensation/step- growth polymerization occur between....
barrel
stabilizers
44. Polymers comprised of two or more different monomers that attach to the chain in long runs of one type of monomer - followed by another monomer AAAAAAAAAAAAABBBBBBBBBBBBBBBBBBAAAAAAAA
eclipsed conformation/ cis - conformation
gauche conformation
thermoplastics
block copolymers
45. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
coloring agents
die
copolymer
configuration
46. One type of polymer that contains at least 85% of polyacrylonitrile PAN
freeze line
functionality
copolymer
acrylic
47. Number of bonds a molecule has formed
polyviyl chloride PVC
any carbon with double bonds or repeated substituents
functionality
polymers
48. Molecule containing a highly reactive unpaired electron
mutual termination
free radical
atactic
syndiotactic dyad
49. Long chain polymers that contain at least 85% of an ester of a substituted aromatic carboxylic acid. these fibers are strong and can dyed or made transpared
elastomers
relative molecular mass RMM
polyesters
structural unit
50. Additives whose primary purpose is to reduce the final cost of the product
constitution
primary bonding
branching
fillers