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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. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
acrylic
primary bonding
polyviyl chloride PVC
stabilizers
2. Softening agents
functionality
side groups/ substituents
plasticizers
viscose process
3. Broad category of polymers that includes polymers containing urethane linkages
constitution
propagation
polyurethanes
isotactic dan
4. 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
block copolymers
polyesters
vulcanization
die
5. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
screen pack
viscose process
plasticizers
configuration
6. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
graft copolymers
termination
thermosets
polymer backbone
7. Arrangement of the largest substituents where the substituets are offset by 120
plasticizers
syndiotactic dyad
staggered conformation
quenching
8. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
configuration
conformation
tow
solution spinning
9. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
tacticity
quenching
primary bonding
High volume thermoplastics HVTP
10. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
step- growth/condensation polymerization
addition polymerization/chain growth/free- radical polymerization
shot size
homopolymer
11. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
propagation
coloring agents
polymer backbone
hopper
12. 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
glass transition temperature Tg
copolymer
weight average molecular weight Mw
mutual termination
13. Covalently bonded chains of molecules with small monomer units repeated from end to end
polymers
solution spinning
polymethylmethacrylate PMMA
propagation
14. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
extruder
tow
freeze line
primary termination
15. Polymer that is made up a single repeat unit
homopolymer
shot size
barrel
coloring agents
16. Additives whose primary purpose is to reduce the final cost of the product
thermoplastics
oligomers
trans - conformation
fillers
17. 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
side groups/ substituents
solution spinning
additives
condensation/step- growth polymerization
18. 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
polymers
vinyl monomer
aramid
19. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
stabilizers
quenching
polyviyl chloride PVC
barrel
20. Smallest repeating unit in a polymer. aka repeat unit
oligomers
vinyl monomer
rayon
structural unit
21. 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
termination
primary termination
viscose process
22. Molecule containing a highly reactive unpaired electron
free radical
thermoplastics
spinneret
fillers
23. Number of bonds a molecule has formed
primary termination
die
functionality
side groups/ substituents
24. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
functional groups
constitution
nylon
quenching
25. 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
staggered conformation
copolymer
side groups/ substituents
26. 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
polyesters
primary termination
functional groups
number average molecular weight Mn
27. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
polymethylmethacrylate PMMA
end groups
quenching
propagation
28. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
elastomers
functionality
copolymer
tacticity
29. Two or more polymers mechanically mixed together but without covalent bonding between them
blends
hopper
petroleum
polyurethanes
30. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
block copolymers
isotactic dan
end groups
graft copolymers
31. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
spinneret
die
thermosets
fillers
32. 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
degree of polymerization DPn
polyurethanes
branching
polyamides
33. Relative configuration of adjecent asymmetric carbons
polypphenylene terephyhalamide PPTA
tacticity
thermosets
staggered conformation
34. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
relative molecular mass RMM
rayon
atactic
alternating copolymers
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
step- growth/condensation polymerization
polymer backbone
termination
acrylic
36. Conformation in which the largest substituents are offset by 180
termination
condensation/step- growth polymerization
polymers
trans - conformation
37. Low- molecular- weight building blocks repeated in the polymer chain
constitution
elastomers
monomers
branching
38. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
gauche conformation
tow
polyurethanes
plasticizers
39. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
trans - conformation
fillers
viscose process
polymethylmethacrylate PMMA
40. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
nylon
tow
propagation
coloring agents
41. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
syndiotactic dyad
step- growth/condensation polymerization
thermosets
conformation
42. Atoms attached to the polymer backbone.
dyes
asymetric
side groups/ substituents
gauche conformation
43. 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
glass transition temperature Tg
plyacrylonitrile PAN
number average molecular weight Mn
44. 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
quenching
graft copolymers
block copolymers
addition polymerization/chain growth/free- radical polymerization
45. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
eclipsed conformation/ cis - conformation
end groups
polyurethanes
plasticizers
46. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
hopper
dyes
monomers
quenching
47. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
shot size
nylon
step- growth/condensation polymerization
propagation
48. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
polypphenylene terephyhalamide PPTA
nylon
poly- p- phenylene benzobisoxazole PBO
blends
49. Number of repeat/structural units in a polymer chain
extruder
polypphenylene terephyhalamide PPTA
homopolymer
degree of polymerization DPn
50. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
staggered conformation
polyurethanes
secondary bonding
polymer backbone