SUBJECTS
|
BROWSE
|
CAREER CENTER
|
POPULAR
|
JOIN
|
LOGIN
Business Skills
|
Soft Skills
|
Basic Literacy
|
Certifications
About
|
Help
|
Privacy
|
Terms
|
Email
Search
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 can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
graft copolymers
block copolymers
elastomers
syndiotactic dyad
2. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
structural unit
free radical
conformation
aramid
3. 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
petroleum
viscose process
plyacrylonitrile PAN
relative molecular mass RMM
4. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
plyacrylonitrile PAN
additives
die
degree of polymerization DPn
5. Two or more polymers mechanically mixed together but without covalent bonding between them
polymethylmethacrylate PMMA
trans - conformation
barrel
blends
6. Covalent bonding of the polymer backbone and side groups
primary bonding
eclipsed conformation/ cis - conformation
propagation
solution spinning
7. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
aramid
elastomers
side groups/ substituents
extruder
8. Covalently bonded chains of molecules with small monomer units repeated from end to end
polymer backbone
degree of polymerization DPn
structural unit
polymers
9. 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
thermoplastics
plyacrylonitrile PAN
most common condensation/step- growth polymerization occur between....
10. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
melt spinning
barrel
glass transition temperature Tg
poly- p- phenylene benzobisoxazole PBO
11. Broad category of polymers that includes polymers containing urethane linkages
barrel
initiation
polyurethanes
poly- p- phenylene benzobisoxazole PBO
12. Number of repeat/structural units in a polymer chain
fillers
nylon
degree of polymerization DPn
conformation
13. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
condensation/step- growth polymerization
propagation
hopper
termination
14. 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
injection molding
quenching
barrel
nylon
15. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
weight average molecular weight Mw
dyes
secondary bonding
step- growth/condensation polymerization
16. An acid and an alcohol
most common condensation/step- growth polymerization occur between....
mutual termination
freeze line
die
17. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
pigments
polymer backbone
plyacrylonitrile PAN
most common condensation/step- growth polymerization occur between....
18. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
polyamides
polymethylmethacrylate PMMA
relative molecular mass RMM
asymetric
19. Double bounded organic molecule used to begin addition polymerization
thermosets
vinyl monomer
most common condensation/step- growth polymerization occur between....
polymers
20. Additives whose primary purpose is to reduce the final cost of the product
primary bonding
polyesters
random copolymers
fillers
21. Polymer made up of two of more differenet monomers covalently bonded together
oligomers
copolymer
addition polymerization/chain growth/free- radical polymerization
isotactic dan
22. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
hopper
trans - conformation
dyes
freeze line
23. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
nylon
quenching
plasticizers
vulcanization
24. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
tacticity
condensation/step- growth polymerization
stabilizers
poly- p- phenylene benzobisoxazole PBO
25. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
polyesters
polypphenylene terephyhalamide PPTA
initiation
functional groups
26. Carbon atom capable of multiple configurations due to four different substituents
barrel
asymetric
most common condensation/step- growth polymerization occur between....
polyesters
27. Primary raw material for most polymers
vinyl monomer
dyes
petroleum
polyamides
28. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
spinneret
polyesters
cracking
polyviyl chloride PVC
29. 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
plasticizers
polyesters
end groups
constitution
30. Molecule containing a highly reactive unpaired electron
freeze line
graft copolymers
acrylic
free radical
31. Number of bonds a molecule has formed
functional groups
random copolymers
propagation
functionality
32. 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
configuration
polyesters
step- growth/condensation polymerization
polyamides
33. 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
atactic
polyurethanes
most common condensation/step- growth polymerization occur between....
34. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
primary bonding
weight average molecular weight Mw
gauche conformation
nylon
35. Low- molecular- weight building blocks repeated in the polymer chain
degree of polymerization DPn
monomers
High volume thermoplastics HVTP
barrel
36. Polymer that is made up a single repeat unit
primary bonding
weight average molecular weight Mw
homopolymer
relative molecular mass RMM
37. Relative configuration of adjecent asymmetric carbons
initiation
functionality
tacticity
alternating copolymers
38. 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
condensation/step- growth polymerization
plasticizers
acrylic
side groups/ substituents
39. 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
monomers
step- growth/condensation polymerization
functional groups
40. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
additives
melt spinning
secondary bonding
shot size
41. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
primary bonding
constitution
propagation
thermoplastics
42. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
graft copolymers
asymetric
polymer backbone
poly- p- phenylene benzobisoxazole PBO
43. Atoms attached to the polymer backbone.
configuration
side groups/ substituents
end groups
tacticity
44. Form of the molecular weight of a sample of polymer chains determined by dividing the mass of the specimen by total number of mols present; always less than weight average molecular weight; all molecules regardless of size correlate well with Mn
termination
mutual termination
any carbon with double bonds or repeated substituents
number average molecular weight Mn
45. Is not asymetric and cannot have multiple configurations
screen pack
shot size
any carbon with double bonds or repeated substituents
trans - conformation
46. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
nylon
primary termination
glass transition temperature Tg
tow
47. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
extruder
random copolymers
polymer backbone
branching
48. Porcess of breaking large organic hydrocarbons into smaller molecules
tacticity
barrel
cracking
stabilizers
49. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
polyamides
oligomers
eclipsed conformation/ cis - conformation
plyacrylonitrile PAN
50. 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
thermosets
thermoplastics
isotactic dan
mutual termination