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. 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
weight average molecular weight Mw
any carbon with double bonds or repeated substituents
extruder
solution spinning
2. 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
freeze line
most common condensation/step- growth polymerization occur between....
mutual termination
secondary bonding
3. Atoms attached to the polymer backbone.
condensation/step- growth polymerization
side groups/ substituents
pigments
configuration
4. Conformation in which the largest substituents are offset by 180
secondary bonding
trans - conformation
acrylic
vulcanization
5. 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
trans - conformation
High volume thermoplastics HVTP
step- growth/condensation polymerization
block copolymers
6. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
tow
poly- p- phenylene benzobisoxazole PBO
freeze line
any carbon with double bonds or repeated substituents
7. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
weight average molecular weight Mw
polyesters
solution spinning
elastomers
8. Polymer that is made up a single repeat unit
homopolymer
thermosets
oligomers
quenching
9. Primary raw material for most polymers
configuration
block copolymers
polyamides
petroleum
10. First step in the process of polymerization - during which a free radical is formed
initiation
structural unit
conformation
acrylic
11. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
elastomers
barrel
polyviyl chloride PVC
additives
12. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
polypphenylene terephyhalamide PPTA
tow
High volume thermoplastics HVTP
functionality
13. 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
plyacrylonitrile PAN
nylon
weight average molecular weight Mw
condensation/step- growth polymerization
14. Molecule containing a highly reactive unpaired electron
vulcanization
block copolymers
free radical
relative molecular mass RMM
15. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
thermoplastics
any carbon with double bonds or repeated substituents
atactic
petroleum
16. 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
melt spinning
plasticizers
initiation
termination
17. Conformation that occurs when the largest substituent in a molecule are offset by 60
asymetric
gauche conformation
relative molecular mass RMM
poly- p- phenylene benzobisoxazole PBO
18. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
coloring agents
hopper
side groups/ substituents
polymer backbone
19. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
structural unit
atactic
rayon
extruder
20. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
number average molecular weight Mn
syndiotactic dyad
eclipsed conformation/ cis - conformation
plasticizers
21. Polymers that contain amide (- N-) groups in the chain
polyamides
stabilizers
staggered conformation
tacticity
22. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
configuration
extruder
block copolymers
graft copolymers
23. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
viscose process
thermosets
monomers
side groups/ substituents
24. Low- molecular- weight building blocks repeated in the polymer chain
hopper
condensation/step- growth polymerization
conformation
monomers
25. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
spinneret
branching
thermoplastics
copolymer
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
degree of polymerization DPn
screen pack
freeze line
syndiotactic dyad
27. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
functionality
mutual termination
screen pack
most common condensation/step- growth polymerization occur between....
28. 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
isotactic dan
freeze line
end groups
alternating copolymers
29. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
stabilizers
aramid
graft copolymers
petroleum
30. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
oligomers
functionality
asymetric
addition polymerization/chain growth/free- radical polymerization
31. Covalently bonded chains of molecules with small monomer units repeated from end to end
polymers
polymer backbone
solution spinning
aramid
32. 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
additives
fillers
copolymer
33. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
poly- p- phenylene benzobisoxazole PBO
branching
shot size
polyesters
34. 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
rayon
barrel
termination
side groups/ substituents
35. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
poly- p- phenylene benzobisoxazole PBO
propagation
constitution
graft copolymers
36. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
plasticizers
condensation/step- growth polymerization
primary termination
random copolymers
37. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
viscose process
polypphenylene terephyhalamide PPTA
mutual termination
aramid
38. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
primary termination
constitution
block copolymers
rayon
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
tow
primary termination
configuration
die
40. Number of bonds a molecule has formed
most common condensation/step- growth polymerization occur between....
thermosets
screen pack
functionality
41. Number of repeat/structural units in a polymer chain
degree of polymerization DPn
block copolymers
fillers
syndiotactic dyad
42. 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
number average molecular weight Mn
most common condensation/step- growth polymerization occur between....
freeze line
43. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
nylon
coloring agents
end groups
trans - conformation
44. Simple polymeric material produced as pellets in large quantities
High volume thermoplastics HVTP
polyesters
isotactic dan
plasticizers
45. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
initiation
conformation
atactic
gauche conformation
46. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
plasticizers
propagation
rayon
copolymer
47. Double bounded organic molecule used to begin addition polymerization
branching
monomers
vinyl monomer
primary bonding
48. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
primary termination
hopper
weight average molecular weight Mw
polymer backbone
49. 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
step- growth/condensation polymerization
vulcanization
relative molecular mass RMM
50. 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
plasticizers
step- growth/condensation polymerization
die
vinyl monomer