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. Atoms attached to the polymer backbone.
side groups/ substituents
quenching
plyacrylonitrile PAN
polyesters
2. Carbon atom capable of multiple configurations due to four different substituents
polyviyl chloride PVC
asymetric
end groups
shot size
3. 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
polymethylmethacrylate PMMA
additives
glass transition temperature Tg
4. Porcess of breaking large organic hydrocarbons into smaller molecules
cracking
functional groups
pigments
extruder
5. Double bounded organic molecule used to begin addition polymerization
functional groups
structural unit
most common condensation/step- growth polymerization occur between....
vinyl monomer
6. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
spinneret
polymers
primary termination
injection molding
7. 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
polypphenylene terephyhalamide PPTA
step- growth/condensation polymerization
nylon
8. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
viscose process
injection molding
elastomers
fillers
9. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
block copolymers
gauche conformation
polyviyl chloride PVC
free radical
10. 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
most common condensation/step- growth polymerization occur between....
die
acrylic
block copolymers
11. 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
side groups/ substituents
petroleum
glass transition temperature Tg
mutual termination
12. 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
staggered conformation
die
any carbon with double bonds or repeated substituents
mutual termination
13. Conformation that occurs when the largest substituent in a molecule are offset by 60
gauche conformation
polypphenylene terephyhalamide PPTA
fillers
mutual 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
barrel
random copolymers
viscose process
nylon
15. 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
gauche conformation
condensation/step- growth polymerization
atactic
melt spinning
16. Polymer made up of two of more differenet monomers covalently bonded together
acrylic
screen pack
High volume thermoplastics HVTP
copolymer
17. Covalent bonding of the polymer backbone and side groups
rayon
primary bonding
freeze line
polymethylmethacrylate PMMA
18. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
acrylic
configuration
gauche conformation
melt spinning
19. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
barrel
polymethylmethacrylate PMMA
conformation
graft copolymers
20. One type of polymer that contains at least 85% of polyacrylonitrile PAN
acrylic
trans - conformation
hopper
staggered conformation
21. Number of repeat/structural units in a polymer chain
structural unit
addition polymerization/chain growth/free- radical polymerization
initiation
degree of polymerization DPn
22. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
random copolymers
aramid
most common condensation/step- growth polymerization occur between....
additives
23. An acid and an alcohol
most common condensation/step- growth polymerization occur between....
barrel
configuration
shot size
24. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
copolymer
polyviyl chloride PVC
poly- p- phenylene benzobisoxazole PBO
injection molding
25. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
barrel
configuration
poly- p- phenylene benzobisoxazole PBO
atactic
26. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
configuration
freeze line
rayon
propagation
27. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
oligomers
petroleum
solution spinning
thermoplastics
28. 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
polyurethanes
number average molecular weight Mn
plasticizers
poly- p- phenylene benzobisoxazole PBO
29. 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
solution spinning
shot size
hopper
30. Polymer that is made up a single repeat unit
weight average molecular weight Mw
secondary bonding
homopolymer
alternating copolymers
31. 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
termination
hopper
polyesters
functionality
32. Conformation in which the largest substituents are offset by 180
random copolymers
dyes
trans - conformation
extruder
33. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
pigments
staggered conformation
oligomers
shot size
34. Low- molecular- weight building blocks repeated in the polymer chain
configuration
functionality
monomers
stabilizers
35. Polymers that contain amide (- N-) groups in the chain
isotactic dan
polyamides
additives
termination
36. 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
degree of polymerization DPn
block copolymers
polyurethanes
37. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
viscose process
syndiotactic dyad
end groups
polyurethanes
38. Smallest repeating unit in a polymer. aka repeat unit
polymer backbone
homopolymer
extruder
structural unit
39. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
thermosets
block copolymers
step- growth/condensation polymerization
polyesters
40. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
extruder
block copolymers
condensation/step- growth polymerization
most common condensation/step- growth polymerization occur between....
41. Additives whose primary purpose is to reduce the final cost of the product
polyesters
thermoplastics
blends
fillers
42. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
random copolymers
petroleum
mutual termination
end groups
43. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
conformation
hopper
homopolymer
polyamides
44. Relative configuration of adjecent asymmetric carbons
tacticity
fillers
thermosets
cracking
45. Is not asymetric and cannot have multiple configurations
any carbon with double bonds or repeated substituents
polyamides
plasticizers
viscose process
46. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
acrylic
configuration
tow
fillers
47. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
aramid
free radical
plyacrylonitrile PAN
rayon
48. Arrangement of the largest substituents where the substituets are offset by 120
graft copolymers
elastomers
staggered conformation
vulcanization
49. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
alternating copolymers
elastomers
any carbon with double bonds or repeated substituents
primary termination
50. 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
random copolymers
isotactic dan
relative molecular mass RMM
conformation