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
Subject
:
engineering
Instructions:
Answer
50
questions in
20 minutes
.
2 minutes extra for reading the instructions.
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. 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
acrylic
functionality
condensation/step- growth polymerization
fillers
2. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
condensation/step- growth polymerization
dyes
extruder
functional groups
3. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
injection molding
fillers
hopper
constitution
4. 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
High volume thermoplastics HVTP
shot size
blends
5. Polymers that contain amide (- N-) groups in the chain
polyamides
mutual termination
syndiotactic dyad
poly- p- phenylene benzobisoxazole PBO
6. Softening agents
plasticizers
hopper
High volume thermoplastics HVTP
cracking
7. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
functional groups
addition polymerization/chain growth/free- radical polymerization
melt spinning
secondary bonding
8. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
random copolymers
aramid
cracking
relative molecular mass RMM
9. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
fillers
plasticizers
rayon
stabilizers
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
monomers
secondary bonding
solution spinning
screen pack
11. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
viscose process
pigments
trans - conformation
syndiotactic dyad
12. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
secondary bonding
stabilizers
copolymer
poly- p- phenylene benzobisoxazole PBO
13. 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
atactic
pigments
14. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
polymer backbone
polypphenylene terephyhalamide PPTA
isotactic dan
polyamides
15. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
thermosets
petroleum
additives
quenching
16. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
spinneret
vulcanization
tow
polymer backbone
17. 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 bonding
relative molecular mass RMM
primary termination
staggered conformation
18. Relative configuration of adjecent asymmetric carbons
die
copolymer
stabilizers
tacticity
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
asymetric
additives
propagation
thermoplastics
20. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
conformation
copolymer
staggered conformation
polyviyl chloride PVC
21. Polymer that is made up a single repeat unit
polyurethanes
polymers
graft copolymers
homopolymer
22. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
thermosets
vinyl monomer
elastomers
side groups/ substituents
23. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
atactic
blends
condensation/step- growth polymerization
tacticity
24. 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
die
barrel
secondary bonding
homopolymer
25. 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
primary termination
aramid
mutual termination
isotactic dan
26. Two or more polymers mechanically mixed together but without covalent bonding between them
functionality
glass transition temperature Tg
blends
isotactic dan
27. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
rayon
eclipsed conformation/ cis - conformation
structural unit
addition polymerization/chain growth/free- radical polymerization
28. Smallest repeating unit in a polymer. aka repeat unit
random copolymers
syndiotactic dyad
atactic
structural unit
29. Polymer made up of two of more differenet monomers covalently bonded together
asymetric
staggered conformation
primary bonding
copolymer
30. Covalently bonded chains of molecules with small monomer units repeated from end to end
configuration
block copolymers
polymers
structural unit
31. Low- molecular- weight building blocks repeated in the polymer chain
cracking
gauche conformation
monomers
acrylic
32. Conformation in which the largest substituents are offset by 180
trans - conformation
hopper
acrylic
side groups/ substituents
33. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
shot size
gauche conformation
condensation/step- growth polymerization
die
34. Primary raw material for most polymers
oligomers
vulcanization
isotactic dan
petroleum
35. 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
free radical
vulcanization
step- growth/condensation polymerization
36. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
tow
most common condensation/step- growth polymerization occur between....
High volume thermoplastics HVTP
weight average molecular weight Mw
37. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
freeze line
thermoplastics
acrylic
thermosets
38. 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
vinyl monomer
block copolymers
eclipsed conformation/ cis - conformation
polymethylmethacrylate PMMA
39. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
polypphenylene terephyhalamide PPTA
vinyl monomer
polyviyl chloride PVC
nylon
40. Conformation that occurs when the largest substituent in a molecule are offset by 60
thermosets
polyurethanes
conformation
gauche conformation
41. 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
spinneret
glass transition temperature Tg
isotactic dan
hopper
42. 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
elastomers
propagation
structural unit
polyesters
43. Porcess of breaking large organic hydrocarbons into smaller molecules
random copolymers
fillers
dyes
cracking
44. Carbon atom capable of multiple configurations due to four different substituents
asymetric
thermoplastics
secondary bonding
plasticizers
45. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
graft copolymers
gauche conformation
monomers
polyurethanes
46. An acid and an alcohol
polyurethanes
homopolymer
most common condensation/step- growth polymerization occur between....
any carbon with double bonds or repeated substituents
47. Number of bonds a molecule has formed
functionality
atactic
condensation/step- growth polymerization
rayon
48. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
constitution
additives
aramid
acrylic
49. Is not asymetric and cannot have multiple configurations
any carbon with double bonds or repeated substituents
block copolymers
acrylic
initiation
50. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
aramid
copolymer
tacticity
degree of polymerization DPn