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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. An acid and an alcohol
extruder
oligomers
eclipsed conformation/ cis - conformation
most common condensation/step- growth polymerization occur between....
2. Two or more polymers mechanically mixed together but without covalent bonding between them
blends
rayon
stabilizers
polymethylmethacrylate PMMA
3. Molecule containing a highly reactive unpaired electron
free radical
condensation/step- growth polymerization
thermoplastics
melt spinning
4. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
branching
viscose process
shot size
degree of polymerization DPn
5. Smallest repeating unit in a polymer. aka repeat unit
thermoplastics
asymetric
polyesters
structural unit
6. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
any carbon with double bonds or repeated substituents
initiation
spinneret
aramid
7. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
trans - conformation
thermosets
functionality
barrel
8. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
any carbon with double bonds or repeated substituents
primary bonding
glass transition temperature Tg
quenching
9. 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
syndiotactic dyad
alternating copolymers
condensation/step- growth polymerization
thermosets
10. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
extruder
plyacrylonitrile PAN
primary termination
polyesters
11. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
initiation
elastomers
conformation
petroleum
12. Covalent bonding of the polymer backbone and side groups
primary bonding
alternating copolymers
eclipsed conformation/ cis - conformation
number average molecular weight Mn
13. 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
branching
cracking
weight average molecular weight Mw
polypphenylene terephyhalamide PPTA
14. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
melt spinning
end groups
additives
freeze line
15. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
polyesters
trans - conformation
glass transition temperature Tg
polyviyl chloride PVC
16. Conformation in which the largest substituents are offset by 180
quenching
nylon
trans - conformation
degree of polymerization DPn
17. Is not asymetric and cannot have multiple configurations
structural unit
any carbon with double bonds or repeated substituents
pigments
condensation/step- growth polymerization
18. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
homopolymer
oligomers
copolymer
injection molding
19. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
acrylic
thermoplastics
free radical
structural unit
20. 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
number average molecular weight Mn
die
most common condensation/step- growth polymerization occur between....
polyviyl chloride PVC
21. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
vulcanization
degree of polymerization DPn
dyes
tacticity
22. Additives whose primary purpose is to reduce the final cost of the product
monomers
aramid
shot size
fillers
23. 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
syndiotactic dyad
step- growth/condensation polymerization
graft copolymers
primary termination
24. Primary raw material for most polymers
structural unit
petroleum
freeze line
plasticizers
25. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
nylon
relative molecular mass RMM
graft copolymers
end groups
26. One type of polymer that contains at least 85% of polyacrylonitrile PAN
acrylic
degree of polymerization DPn
plyacrylonitrile PAN
blends
27. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
staggered conformation
vulcanization
freeze line
block copolymers
28. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
conformation
functional groups
rayon
acrylic
29. Pigments or dyes that change the way light is absorbed or reflected by a polymer
solution spinning
coloring agents
polyviyl chloride PVC
spinneret
30. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
aramid
blends
oligomers
conformation
31. 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
initiation
condensation/step- growth polymerization
vinyl monomer
weight average molecular weight Mw
32. Porcess of breaking large organic hydrocarbons into smaller molecules
cracking
freeze line
constitution
graft copolymers
33. 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
die
quenching
thermosets
34. Low- molecular- weight building blocks repeated in the polymer chain
monomers
stabilizers
screen pack
plasticizers
35. Polymers that contain amide (- N-) groups in the chain
eclipsed conformation/ cis - conformation
High volume thermoplastics HVTP
weight average molecular weight Mw
polyamides
36. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
degree of polymerization DPn
block copolymers
polyesters
alternating copolymers
37. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
functional groups
dyes
primary bonding
atactic
38. Atoms attached to the polymer backbone.
side groups/ substituents
acrylic
nylon
most common condensation/step- growth polymerization occur between....
39. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
solution spinning
alternating copolymers
extruder
number average molecular weight Mn
40. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
glass transition temperature Tg
screen pack
blends
aramid
41. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
aramid
eclipsed conformation/ cis - conformation
petroleum
most common condensation/step- growth polymerization occur between....
42. Broad category of polymers that includes polymers containing urethane linkages
polyurethanes
oligomers
vulcanization
step- growth/condensation polymerization
43. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
configuration
gauche conformation
poly- p- phenylene benzobisoxazole PBO
polymers
44. Relative configuration of adjecent asymmetric carbons
polyviyl chloride PVC
copolymer
tacticity
graft copolymers
45. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
addition polymerization/chain growth/free- radical polymerization
step- growth/condensation polymerization
constitution
rayon
46. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
homopolymer
shot size
petroleum
barrel
47. 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
block copolymers
acrylic
secondary bonding
number average molecular weight Mn
48. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
conformation
polymethylmethacrylate PMMA
nylon
graft copolymers
49. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
fillers
thermosets
polypphenylene terephyhalamide PPTA
blends
50. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
number average molecular weight Mn
eclipsed conformation/ cis - conformation
solution spinning
termination