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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. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
rayon
mutual termination
melt spinning
alternating copolymers
2. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
plasticizers
viscose process
stabilizers
thermosets
3. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
spinneret
elastomers
dyes
fillers
4. Primary raw material for most polymers
petroleum
polymethylmethacrylate PMMA
copolymer
end groups
5. Polymer that is made up a single repeat unit
most common condensation/step- growth polymerization occur between....
secondary bonding
polypphenylene terephyhalamide PPTA
homopolymer
6. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
asymetric
constitution
rayon
polyviyl chloride PVC
7. 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
solution spinning
conformation
glass transition temperature Tg
end groups
8. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
additives
quenching
trans - conformation
staggered conformation
9. Additives whose primary purpose is to reduce the final cost of the product
acrylic
oligomers
pigments
fillers
10. Polymers that contain amide (- N-) groups in the chain
isotactic dan
solution spinning
polyamides
rayon
11. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
eclipsed conformation/ cis - conformation
mutual termination
extruder
melt spinning
12. Arrangement of the largest substituents where the substituets are offset by 120
asymetric
most common condensation/step- growth polymerization occur between....
shot size
staggered conformation
13. Broad category of polymers that includes polymers containing urethane linkages
trans - conformation
polyurethanes
quenching
fillers
14. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
conformation
addition polymerization/chain growth/free- radical polymerization
stabilizers
side groups/ substituents
15. Polymer made up of two of more differenet monomers covalently bonded together
copolymer
injection molding
blends
functionality
16. Coloring agents that do not dissolve into the polymer
pigments
conformation
step- growth/condensation polymerization
side groups/ substituents
17. Two or more polymers mechanically mixed together but without covalent bonding between them
blends
block copolymers
polyamides
coloring agents
18. Pigments or dyes that change the way light is absorbed or reflected by a polymer
dyes
coloring agents
glass transition temperature Tg
atactic
19. Molecule containing a highly reactive unpaired electron
most common condensation/step- growth polymerization occur between....
free radical
staggered conformation
polypphenylene terephyhalamide PPTA
20. Porcess of breaking large organic hydrocarbons into smaller molecules
viscose process
functional groups
atactic
cracking
21. 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
plyacrylonitrile PAN
isotactic dan
asymetric
eclipsed conformation/ cis - conformation
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
dyes
polymer backbone
primary termination
block copolymers
23. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
secondary bonding
plyacrylonitrile PAN
primary termination
configuration
24. An acid and an alcohol
most common condensation/step- growth polymerization occur between....
die
shot size
cracking
25. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
step- growth/condensation polymerization
vulcanization
blends
primary bonding
26. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
block copolymers
step- growth/condensation polymerization
mutual termination
functional groups
27. Simple polymeric material produced as pellets in large quantities
propagation
hopper
structural unit
High volume thermoplastics HVTP
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
polyurethanes
plyacrylonitrile PAN
acrylic
relative molecular mass RMM
29. Atoms attached to the polymer backbone.
primary bonding
side groups/ substituents
relative molecular mass RMM
elastomers
30. Conformation that occurs when the largest substituent in a molecule are offset by 60
asymetric
barrel
any carbon with double bonds or repeated substituents
gauche conformation
31. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
gauche conformation
shot size
structural unit
eclipsed conformation/ cis - conformation
32. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
side groups/ substituents
polymer backbone
fillers
coloring agents
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
tacticity
functional groups
plasticizers
free radical
34. 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
melt spinning
plasticizers
polymers
freeze line
35. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
graft copolymers
primary bonding
most common condensation/step- growth polymerization occur between....
free radical
36. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
poly- p- phenylene benzobisoxazole PBO
plasticizers
alternating copolymers
elastomers
37. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
injection molding
blends
viscose process
tow
38. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
quenching
alternating copolymers
nylon
oligomers
39. Conformation in which the largest substituents are offset by 180
tacticity
injection molding
conformation
trans - conformation
40. Low- molecular- weight building blocks repeated in the polymer chain
graft copolymers
cracking
monomers
polymer backbone
41. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
eclipsed conformation/ cis - conformation
end groups
plasticizers
any carbon with double bonds or repeated substituents
42. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
homopolymer
polyviyl chloride PVC
glass transition temperature Tg
poly- p- phenylene benzobisoxazole PBO
43. Covalently bonded chains of molecules with small monomer units repeated from end to end
initiation
trans - conformation
structural unit
polymers
44. 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
secondary bonding
thermosets
solution spinning
step- growth/condensation polymerization
45. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
polymethylmethacrylate PMMA
solution spinning
atactic
viscose process
46. 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
eclipsed conformation/ cis - conformation
gauche conformation
functional groups
condensation/step- growth polymerization
47. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
step- growth/condensation polymerization
aramid
condensation/step- growth polymerization
eclipsed conformation/ cis - conformation
48. 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
structural unit
branching
initiation
any carbon with double bonds or repeated substituents
49. 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
graft copolymers
rayon
aramid
50. 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
cracking
polymethylmethacrylate PMMA
solution spinning
constitution