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. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
termination
plyacrylonitrile PAN
configuration
number average molecular weight Mn
2. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
weight average molecular weight Mw
oligomers
coloring agents
copolymer
3. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
graft copolymers
acrylic
coloring agents
tacticity
4. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
glass transition temperature Tg
polymethylmethacrylate PMMA
constitution
polyesters
5. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
functionality
thermoplastics
plyacrylonitrile PAN
cracking
6. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
block copolymers
asymetric
thermosets
primary termination
7. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
most common condensation/step- growth polymerization occur between....
coloring agents
degree of polymerization DPn
injection molding
8. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
eclipsed conformation/ cis - conformation
hopper
atactic
step- growth/condensation polymerization
9. 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
addition polymerization/chain growth/free- radical polymerization
isotactic dan
trans - conformation
copolymer
10. Number of bonds a molecule has formed
shot size
functionality
eclipsed conformation/ cis - conformation
branching
11. 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
spinneret
number average molecular weight Mn
functionality
plyacrylonitrile PAN
12. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
polypphenylene terephyhalamide PPTA
branching
termination
addition polymerization/chain growth/free- radical polymerization
13. Polymer made up of two of more differenet monomers covalently bonded together
copolymer
homopolymer
functional groups
rayon
14. 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
rayon
elastomers
structural unit
15. Molecule containing a highly reactive unpaired electron
fillers
vulcanization
injection molding
free radical
16. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
random copolymers
functionality
side groups/ substituents
polymers
17. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
thermosets
any carbon with double bonds or repeated substituents
polypphenylene terephyhalamide PPTA
dyes
18. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
most common condensation/step- growth polymerization occur between....
isotactic dan
staggered conformation
tow
19. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
additives
any carbon with double bonds or repeated substituents
step- growth/condensation polymerization
solution spinning
20. 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
hopper
screen pack
plasticizers
initiation
21. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
most common condensation/step- growth polymerization occur between....
die
elastomers
polymer backbone
22. Broad category of polymers that includes polymers containing urethane linkages
polyurethanes
secondary bonding
condensation/step- growth polymerization
any carbon with double bonds or repeated substituents
23. 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
relative molecular mass RMM
thermoplastics
configuration
coloring agents
24. Polymers that contain amide (- N-) groups in the chain
quenching
polyamides
polymethylmethacrylate PMMA
glass transition temperature Tg
25. 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
condensation/step- growth polymerization
rayon
glass transition temperature Tg
vinyl monomer
26. Coloring agents that do not dissolve into the polymer
fillers
most common condensation/step- growth polymerization occur between....
syndiotactic dyad
pigments
27. First step in the process of polymerization - during which a free radical is formed
stabilizers
gauche conformation
end groups
initiation
28. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
side groups/ substituents
extruder
thermosets
primary termination
29. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
tow
degree of polymerization DPn
aramid
gauche conformation
30. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
pigments
configuration
rayon
High volume thermoplastics HVTP
31. Low- molecular- weight building blocks repeated in the polymer chain
screen pack
any carbon with double bonds or repeated substituents
monomers
High volume thermoplastics HVTP
32. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
primary bonding
dyes
thermosets
viscose process
33. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
gauche conformation
secondary bonding
polymer backbone
quenching
34. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
plyacrylonitrile PAN
eclipsed conformation/ cis - conformation
glass transition temperature Tg
termination
35. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
alternating copolymers
condensation/step- growth polymerization
screen pack
injection molding
36. 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
initiation
cracking
step- growth/condensation polymerization
elastomers
37. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
oligomers
poly- p- phenylene benzobisoxazole PBO
polyesters
screen pack
38. Additives whose primary purpose is to reduce the final cost of the product
conformation
hopper
fillers
step- growth/condensation polymerization
39. 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
plasticizers
polyesters
polypphenylene terephyhalamide PPTA
melt spinning
40. Softening agents
melt spinning
vulcanization
copolymer
plasticizers
41. Two or more polymers mechanically mixed together but without covalent bonding between them
elastomers
functionality
branching
blends
42. Number of repeat/structural units in a polymer chain
cracking
degree of polymerization DPn
conformation
additives
43. One type of polymer that contains at least 85% of polyacrylonitrile PAN
acrylic
any carbon with double bonds or repeated substituents
initiation
polymethylmethacrylate PMMA
44. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
High volume thermoplastics HVTP
atactic
end groups
mutual termination
45. 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
staggered conformation
number average molecular weight Mn
additives
branching
46. Conformation that occurs when the largest substituent in a molecule are offset by 60
gauche conformation
primary bonding
plyacrylonitrile PAN
plasticizers
47. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
stabilizers
addition polymerization/chain growth/free- radical polymerization
barrel
shot size
48. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
screen pack
functionality
rayon
addition polymerization/chain growth/free- radical polymerization
49. Conformation in which the largest substituents are offset by 180
trans - conformation
aramid
die
stabilizers
50. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
graft copolymers
propagation
termination
aramid