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. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
aramid
atactic
oligomers
nylon
2. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
free radical
freeze line
elastomers
polyesters
3. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
additives
rayon
extruder
polyviyl chloride PVC
4. 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
aramid
number average molecular weight Mn
plasticizers
extruder
5. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
polypphenylene terephyhalamide PPTA
rayon
plasticizers
random copolymers
6. Carbon atom capable of multiple configurations due to four different substituents
step- growth/condensation polymerization
polyamides
asymetric
structural unit
7. First step in the process of polymerization - during which a free radical is formed
blends
syndiotactic dyad
initiation
constitution
8. Number of bonds a molecule has formed
extruder
most common condensation/step- growth polymerization occur between....
functionality
High volume thermoplastics HVTP
9. 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
poly- p- phenylene benzobisoxazole PBO
functionality
nylon
10. 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
elastomers
end groups
nylon
11. Two or more polymers mechanically mixed together but without covalent bonding between them
polymers
blends
block copolymers
mutual termination
12. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
graft copolymers
nylon
propagation
plasticizers
13. One type of polymer that contains at least 85% of polyacrylonitrile PAN
tow
branching
acrylic
relative molecular mass RMM
14. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
number average molecular weight Mn
primary bonding
addition polymerization/chain growth/free- radical polymerization
condensation/step- growth polymerization
15. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
propagation
polypphenylene terephyhalamide PPTA
plyacrylonitrile PAN
end groups
16. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
configuration
degree of polymerization DPn
weight average molecular weight Mw
functional groups
17. 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
mutual termination
melt spinning
block copolymers
18. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
die
additives
vulcanization
asymetric
19. Broad category of polymers that includes polymers containing urethane linkages
coloring agents
dyes
polyurethanes
weight average molecular weight Mw
20. Covalent bonding of the polymer backbone and side groups
primary bonding
spinneret
oligomers
functionality
21. Conformation that occurs when the largest substituent in a molecule are offset by 60
thermoplastics
gauche conformation
injection molding
quenching
22. 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
coloring agents
block copolymers
screen pack
homopolymer
23. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
branching
structural unit
rayon
screen pack
24. Arrangement of the largest substituents where the substituets are offset by 120
condensation/step- growth polymerization
coloring agents
polyviyl chloride PVC
staggered conformation
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
end groups
hopper
random copolymers
polyesters
26. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
barrel
viscose process
condensation/step- growth polymerization
freeze line
27. 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
trans - conformation
random copolymers
nylon
isotactic dan
28. 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
gauche conformation
structural unit
relative molecular mass RMM
number average molecular weight Mn
29. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
initiation
injection molding
tow
hopper
30. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
eclipsed conformation/ cis - conformation
alternating copolymers
polypphenylene terephyhalamide PPTA
most common condensation/step- growth polymerization occur between....
31. Double bounded organic molecule used to begin addition polymerization
vinyl monomer
stabilizers
functionality
polymer backbone
32. Softening agents
rayon
plasticizers
asymetric
aramid
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
monomers
trans - conformation
plasticizers
atactic
34. 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
degree of polymerization DPn
plyacrylonitrile PAN
step- growth/condensation polymerization
cracking
35. 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
viscose process
isotactic dan
weight average molecular weight Mw
constitution
36. 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
block copolymers
stabilizers
mutual termination
atactic
37. Polymers that contain amide (- N-) groups in the chain
polyamides
homopolymer
stabilizers
constitution
38. 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
extruder
functionality
thermoplastics
branching
39. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
polypphenylene terephyhalamide PPTA
thermosets
blends
poly- p- phenylene benzobisoxazole PBO
40. Molecule containing a highly reactive unpaired electron
additives
free radical
nylon
alternating copolymers
41. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
oligomers
random copolymers
petroleum
additives
42. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
copolymer
addition polymerization/chain growth/free- radical polymerization
shot size
stabilizers
43. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
polyesters
conformation
primary termination
solution spinning
44. Pigments or dyes that change the way light is absorbed or reflected by a polymer
coloring agents
tow
die
glass transition temperature Tg
45. Primary raw material for most polymers
petroleum
weight average molecular weight Mw
glass transition temperature Tg
functional groups
46. Conformation in which the largest substituents are offset by 180
trans - conformation
homopolymer
injection molding
thermoplastics
47. Simple polymeric material produced as pellets in large quantities
polyurethanes
homopolymer
weight average molecular weight Mw
High volume thermoplastics HVTP
48. Atoms attached to the polymer backbone.
fillers
side groups/ substituents
isotactic dan
acrylic
49. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
additives
elastomers
addition polymerization/chain growth/free- radical polymerization
plyacrylonitrile PAN
50. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
relative molecular mass RMM
spinneret
screen pack
blends