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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. Low- molecular- weight building blocks repeated in the polymer chain
monomers
structural unit
conformation
staggered conformation
2. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
coloring agents
barrel
vulcanization
oligomers
3. Smallest repeating unit in a polymer. aka repeat unit
structural unit
additives
alternating copolymers
termination
4. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
stabilizers
screen pack
structural unit
number average molecular weight Mn
5. 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
glass transition temperature Tg
gauche conformation
graft copolymers
elastomers
6. Number of repeat/structural units in a polymer chain
rayon
degree of polymerization DPn
polymers
die
7. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
free radical
thermosets
configuration
polymethylmethacrylate PMMA
8. 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
atactic
step- growth/condensation polymerization
fillers
most common condensation/step- growth polymerization occur between....
9. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
random copolymers
homopolymer
vinyl monomer
polymer backbone
10. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
graft copolymers
conformation
structural unit
elastomers
11. 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
relative molecular mass RMM
block copolymers
stabilizers
most common condensation/step- growth polymerization occur between....
12. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
trans - conformation
freeze line
die
polymer backbone
13. Broad category of polymers that includes polymers containing urethane linkages
injection molding
polyurethanes
vulcanization
coloring agents
14. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
graft copolymers
shot size
branching
melt spinning
15. First step in the process of polymerization - during which a free radical is formed
any carbon with double bonds or repeated substituents
initiation
quenching
vinyl monomer
16. Two or more polymers mechanically mixed together but without covalent bonding between them
spinneret
polyviyl chloride PVC
High volume thermoplastics HVTP
blends
17. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
block copolymers
secondary bonding
any carbon with double bonds or repeated substituents
functional groups
18. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
tow
addition polymerization/chain growth/free- radical polymerization
mutual termination
secondary bonding
19. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
branching
gauche conformation
syndiotactic dyad
eclipsed conformation/ cis - conformation
20. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
polyviyl chloride PVC
polyurethanes
additives
plasticizers
21. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
conformation
dyes
atactic
hopper
22. Pigments or dyes that change the way light is absorbed or reflected by a polymer
polypphenylene terephyhalamide PPTA
configuration
coloring agents
spinneret
23. Covalent bonding of the polymer backbone and side groups
primary termination
primary bonding
functionality
glass transition temperature Tg
24. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
melt spinning
vinyl monomer
polypphenylene terephyhalamide PPTA
step- growth/condensation polymerization
25. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
quenching
asymetric
High volume thermoplastics HVTP
dyes
26. Part of the polymer processing apparatus through which the polymer is pushed - causing the polymer to form a simple shape - such as a rod or tube
die
glass transition temperature Tg
monomers
graft copolymers
27. Conformation that occurs when the largest substituent in a molecule are offset by 60
gauche conformation
weight average molecular weight Mw
polyviyl chloride PVC
step- growth/condensation polymerization
28. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
atactic
polyamides
High volume thermoplastics HVTP
any carbon with double bonds or repeated substituents
29. 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
condensation/step- growth polymerization
syndiotactic dyad
branching
homopolymer
30. Covalently bonded chains of molecules with small monomer units repeated from end to end
number average molecular weight Mn
trans - conformation
hopper
polymers
31. 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
configuration
plasticizers
relative molecular mass RMM
shot size
32. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
extruder
polypphenylene terephyhalamide PPTA
relative molecular mass RMM
atactic
33. Carbon atom capable of multiple configurations due to four different substituents
tow
asymetric
conformation
trans - conformation
34. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
petroleum
oligomers
vulcanization
addition polymerization/chain growth/free- radical polymerization
35. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
poly- p- phenylene benzobisoxazole PBO
end groups
hopper
tacticity
36. Number of bonds a molecule has formed
functionality
syndiotactic dyad
relative molecular mass RMM
dyes
37. Is not asymetric and cannot have multiple configurations
gauche conformation
tow
any carbon with double bonds or repeated substituents
polyviyl chloride PVC
38. Additives whose primary purpose is to reduce the final cost of the product
fillers
coloring agents
thermosets
isotactic dan
39. Coloring agents that do not dissolve into the polymer
pigments
structural unit
initiation
staggered conformation
40. 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
High volume thermoplastics HVTP
vinyl monomer
melt spinning
homopolymer
41. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
step- growth/condensation polymerization
functional groups
tacticity
alternating copolymers
42. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
any carbon with double bonds or repeated substituents
syndiotactic dyad
tow
mutual termination
43. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
block copolymers
nylon
primary bonding
injection molding
44. Configuration of a substituent in a polymer - in which the substituent is located on the same side of the polymer chain in all repeating units
thermosets
secondary bonding
isotactic dan
gauche conformation
45. One type of polymer that contains at least 85% of polyacrylonitrile PAN
structural unit
acrylic
polymethylmethacrylate PMMA
cracking
46. 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
solution spinning
glass transition temperature Tg
stabilizers
nylon
47. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
poly- p- phenylene benzobisoxazole PBO
thermoplastics
number average molecular weight Mn
relative molecular mass RMM
48. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
fillers
number average molecular weight Mn
polymethylmethacrylate PMMA
eclipsed conformation/ cis - conformation
49. Atoms attached to the polymer backbone.
configuration
mutual termination
oligomers
side groups/ substituents
50. 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
plasticizers
side groups/ substituents
atactic
asymetric