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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. Is not asymetric and cannot have multiple configurations
functional groups
syndiotactic dyad
propagation
any carbon with double bonds or repeated substituents
2. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
aramid
quenching
polyviyl chloride PVC
rayon
3. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
atactic
vinyl monomer
solution spinning
random copolymers
4. Two or more polymers mechanically mixed together but without covalent bonding between them
quenching
petroleum
acrylic
blends
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
vulcanization
block copolymers
initiation
configuration
6. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
viscose process
hopper
step- growth/condensation polymerization
thermoplastics
7. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
cracking
end groups
functional groups
gauche conformation
8. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
oligomers
vinyl monomer
conformation
propagation
9. 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
polyesters
pigments
melt spinning
block copolymers
10. Number of repeat/structural units in a polymer chain
constitution
degree of polymerization DPn
fillers
dyes
11. 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
functional groups
melt spinning
extruder
relative molecular mass RMM
12. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
step- growth/condensation polymerization
shot size
trans - conformation
homopolymer
13. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
graft copolymers
degree of polymerization DPn
constitution
asymetric
14. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
any carbon with double bonds or repeated substituents
eclipsed conformation/ cis - conformation
addition polymerization/chain growth/free- radical polymerization
cracking
15. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
additives
spinneret
mutual termination
condensation/step- growth polymerization
16. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
constitution
eclipsed conformation/ cis - conformation
trans - conformation
termination
17. 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
fillers
nylon
any carbon with double bonds or repeated substituents
relative molecular mass RMM
18. Conformation that occurs when the largest substituent in a molecule are offset by 60
secondary bonding
degree of polymerization DPn
gauche conformation
polyurethanes
19. Molecule containing a highly reactive unpaired electron
vulcanization
free radical
polymers
degree of polymerization DPn
20. 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
termination
die
hopper
graft copolymers
21. Softening agents
mutual termination
most common condensation/step- growth polymerization occur between....
plasticizers
viscose process
22. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
relative molecular mass RMM
additives
hopper
nylon
23. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
functional groups
condensation/step- growth polymerization
vinyl monomer
alternating copolymers
24. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
vulcanization
monomers
poly- p- phenylene benzobisoxazole PBO
nylon
25. Carbon atom capable of multiple configurations due to four different substituents
any carbon with double bonds or repeated substituents
functional groups
asymetric
block copolymers
26. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
atactic
cracking
random copolymers
polypphenylene terephyhalamide PPTA
27. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
structural unit
solution spinning
polyamides
primary termination
28. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
plasticizers
structural unit
additives
injection molding
29. One type of polymer that contains at least 85% of polyacrylonitrile PAN
tacticity
quenching
acrylic
injection molding
30. First step in the process of polymerization - during which a free radical is formed
initiation
configuration
barrel
spinneret
31. Relative configuration of adjecent asymmetric carbons
tacticity
any carbon with double bonds or repeated substituents
polyesters
trans - conformation
32. Polymer made up of two of more differenet monomers covalently bonded together
conformation
branching
copolymer
tacticity
33. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
functional groups
isotactic dan
side groups/ substituents
syndiotactic dyad
34. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
extruder
tow
staggered conformation
isotactic dan
35. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
polymers
melt spinning
dyes
functionality
36. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
quenching
initiation
cracking
propagation
37. 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
degree of polymerization DPn
polypphenylene terephyhalamide PPTA
extruder
weight average molecular weight Mw
38. Smallest repeating unit in a polymer. aka repeat unit
end groups
pigments
structural unit
polymers
39. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
functionality
acrylic
mutual termination
polymer backbone
40. Arrangement of the largest substituents where the substituets are offset by 120
vinyl monomer
polymers
glass transition temperature Tg
staggered conformation
41. 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
dyes
polymers
injection molding
mutual termination
42. Broad category of polymers that includes polymers containing urethane linkages
plyacrylonitrile PAN
polyurethanes
aramid
block copolymers
43. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
aramid
hopper
injection molding
vinyl monomer
44. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
most common condensation/step- growth polymerization occur between....
extruder
copolymer
vulcanization
45. An acid and an alcohol
most common condensation/step- growth polymerization occur between....
vinyl monomer
conformation
spinneret
46. Polymer that is made up a single repeat unit
viscose process
propagation
copolymer
homopolymer
47. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
glass transition temperature Tg
atactic
asymetric
spinneret
48. Simple polymeric material produced as pellets in large quantities
quenching
High volume thermoplastics HVTP
acrylic
nylon
49. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
secondary bonding
homopolymer
most common condensation/step- growth polymerization occur between....
viscose process
50. Conformation in which the largest substituents are offset by 180
viscose process
trans - conformation
High volume thermoplastics HVTP
plyacrylonitrile PAN