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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. Polymers that contain amide (- N-) groups in the chain
coloring agents
functionality
polyamides
shot size
2. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
blends
graft copolymers
atactic
addition polymerization/chain growth/free- radical polymerization
3. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
nylon
barrel
any carbon with double bonds or repeated substituents
gauche conformation
4. Additives whose primary purpose is to reduce the final cost of the product
extruder
structural unit
branching
fillers
5. 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
elastomers
weight average molecular weight Mw
condensation/step- growth polymerization
tacticity
6. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
pigments
quenching
relative molecular mass RMM
primary termination
7. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
degree of polymerization DPn
cracking
blends
elastomers
8. An acid and an alcohol
viscose process
free radical
most common condensation/step- growth polymerization occur between....
asymetric
9. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
glass transition temperature Tg
injection molding
screen pack
plyacrylonitrile PAN
10. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
additives
glass transition temperature Tg
thermoplastics
shot size
11. 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
weight average molecular weight Mw
oligomers
any carbon with double bonds or repeated substituents
random copolymers
12. 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
plasticizers
conformation
barrel
polyamides
13. 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
stabilizers
end groups
conformation
plasticizers
14. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
polypphenylene terephyhalamide PPTA
monomers
syndiotactic dyad
High volume thermoplastics HVTP
15. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
polypphenylene terephyhalamide PPTA
polymethylmethacrylate PMMA
configuration
polyesters
16. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
termination
addition polymerization/chain growth/free- radical polymerization
graft copolymers
fillers
17. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
viscose process
nylon
hopper
addition polymerization/chain growth/free- radical polymerization
18. 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
branching
gauche conformation
relative molecular mass RMM
syndiotactic dyad
19. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
structural unit
melt spinning
functionality
screen pack
20. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
screen pack
viscose process
copolymer
secondary bonding
21. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
petroleum
constitution
screen pack
plyacrylonitrile PAN
22. First step in the process of polymerization - during which a free radical is formed
fillers
aramid
staggered conformation
initiation
23. Low- molecular- weight building blocks repeated in the polymer chain
tacticity
step- growth/condensation polymerization
staggered conformation
monomers
24. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
poly- p- phenylene benzobisoxazole PBO
condensation/step- growth polymerization
coloring agents
pigments
25. 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
polymer backbone
polyesters
atactic
branching
26. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
atactic
spinneret
degree of polymerization DPn
eclipsed conformation/ cis - conformation
27. Polymer made up of two of more differenet monomers covalently bonded together
viscose process
glass transition temperature Tg
nylon
copolymer
28. Number of repeat/structural units in a polymer chain
degree of polymerization DPn
dyes
tow
acrylic
29. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
functional groups
block copolymers
nylon
alternating copolymers
30. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
freeze line
polyamides
spinneret
additives
31. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
isotactic dan
hopper
nylon
dyes
32. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
end groups
asymetric
polypphenylene terephyhalamide PPTA
copolymer
33. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
weight average molecular weight Mw
spinneret
homopolymer
syndiotactic dyad
34. Conformation that occurs when the largest substituent in a molecule are offset by 60
gauche conformation
die
copolymer
aramid
35. Porcess of breaking large organic hydrocarbons into smaller molecules
weight average molecular weight Mw
elastomers
cracking
solution spinning
36. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
solution spinning
pigments
constitution
functionality
37. Polymer that is made up a single repeat unit
freeze line
nylon
homopolymer
polymers
38. Softening agents
rayon
polyesters
plasticizers
die
39. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
graft copolymers
polyurethanes
condensation/step- growth polymerization
shot size
40. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
polymethylmethacrylate PMMA
eclipsed conformation/ cis - conformation
vulcanization
oligomers
41. Double bounded organic molecule used to begin addition polymerization
condensation/step- growth polymerization
vinyl monomer
tow
glass transition temperature Tg
42. Coloring agents that do not dissolve into the polymer
vulcanization
most common condensation/step- growth polymerization occur between....
pigments
polypphenylene terephyhalamide PPTA
43. Broad category of polymers that includes polymers containing urethane linkages
polyurethanes
propagation
High volume thermoplastics HVTP
melt spinning
44. 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
elastomers
petroleum
branching
vulcanization
45. Smallest repeating unit in a polymer. aka repeat unit
acrylic
structural unit
initiation
High volume thermoplastics HVTP
46. One of the two different types of termination in the polymerization process. during this type of termination - the free radicals from two different polymer chains join to end the propogation process
mutual termination
melt spinning
primary termination
syndiotactic dyad
47. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
most common condensation/step- growth polymerization occur between....
pigments
extruder
spinneret
48. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
hopper
vulcanization
tow
barrel
49. 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
thermoplastics
isotactic dan
conformation
structural unit
50. Atoms attached to the polymer backbone.
polyesters
tacticity
side groups/ substituents
hopper