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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. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
thermosets
functional groups
secondary bonding
thermoplastics
2. 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
atactic
syndiotactic dyad
isotactic dan
melt spinning
3. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
extruder
cracking
plyacrylonitrile PAN
hopper
4. 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
end groups
relative molecular mass RMM
spinneret
eclipsed conformation/ cis - conformation
5. 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
staggered conformation
random copolymers
solution spinning
condensation/step- growth polymerization
6. Coloring agents that do not dissolve into the polymer
isotactic dan
primary bonding
pigments
vinyl monomer
7. Number of bonds a molecule has formed
High volume thermoplastics HVTP
alternating copolymers
polyviyl chloride PVC
functionality
8. Low- molecular- weight building blocks repeated in the polymer chain
polyviyl chloride PVC
atactic
conformation
monomers
9. Broad category of polymers that includes polymers containing urethane linkages
degree of polymerization DPn
asymetric
polyurethanes
blends
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
fillers
acrylic
petroleum
solution spinning
11. Is not asymetric and cannot have multiple configurations
any carbon with double bonds or repeated substituents
polymers
cracking
additives
12. Smallest repeating unit in a polymer. aka repeat unit
trans - conformation
initiation
structural unit
eclipsed conformation/ cis - conformation
13. 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
block copolymers
degree of polymerization DPn
poly- p- phenylene benzobisoxazole PBO
branching
14. Covalent bonding of the polymer backbone and side groups
primary bonding
pigments
configuration
injection molding
15. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
High volume thermoplastics HVTP
stabilizers
homopolymer
petroleum
16. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
side groups/ substituents
staggered conformation
nylon
polymer backbone
17. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
syndiotactic dyad
dyes
any carbon with double bonds or repeated substituents
relative molecular mass RMM
18. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
screen pack
shot size
aramid
melt spinning
19. Conformation that occurs when the largest substituent in a molecule are offset by 60
degree of polymerization DPn
gauche conformation
mutual termination
asymetric
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
degree of polymerization DPn
die
quenching
addition polymerization/chain growth/free- radical polymerization
21. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
free radical
plasticizers
shot size
die
22. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
dyes
structural unit
vulcanization
freeze line
23. First step in the process of polymerization - during which a free radical is formed
plasticizers
elastomers
coloring agents
initiation
24. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
relative molecular mass RMM
functional groups
quenching
stabilizers
25. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
copolymer
plasticizers
stabilizers
vulcanization
26. Covalently bonded chains of molecules with small monomer units repeated from end to end
die
polymers
hopper
thermoplastics
27. Primary raw material for most polymers
blends
random copolymers
petroleum
dyes
28. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
end groups
weight average molecular weight Mw
atactic
spinneret
29. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
thermoplastics
thermosets
injection molding
block copolymers
30. Two or more polymers mechanically mixed together but without covalent bonding between them
gauche conformation
oligomers
viscose process
blends
31. Polymers that contain amide (- N-) groups in the chain
configuration
polyamides
constitution
acrylic
32. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
polymethylmethacrylate PMMA
side groups/ substituents
trans - conformation
initiation
33. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
addition polymerization/chain growth/free- radical polymerization
branching
alternating copolymers
free radical
34. Polymer made up of two of more differenet monomers covalently bonded together
random copolymers
functional groups
copolymer
constitution
35. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
most common condensation/step- growth polymerization occur between....
High volume thermoplastics HVTP
polypphenylene terephyhalamide PPTA
barrel
36. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
screen pack
block copolymers
constitution
poly- p- phenylene benzobisoxazole PBO
37. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
injection molding
functionality
spinneret
propagation
38. Carbon atom capable of multiple configurations due to four different substituents
asymetric
tow
injection molding
polyurethanes
39. 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
screen pack
viscose process
branching
solution spinning
40. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
primary bonding
High volume thermoplastics HVTP
atactic
screen pack
41. Arrangement of the largest substituents where the substituets are offset by 120
staggered conformation
propagation
step- growth/condensation polymerization
initiation
42. Relative configuration of adjecent asymmetric carbons
tacticity
screen pack
glass transition temperature Tg
functional groups
43. One type of polymer that contains at least 85% of polyacrylonitrile PAN
homopolymer
solution spinning
primary bonding
acrylic
44. An acid and an alcohol
barrel
number average molecular weight Mn
most common condensation/step- growth polymerization occur between....
nylon
45. Pigments or dyes that change the way light is absorbed or reflected by a polymer
functionality
random copolymers
injection molding
coloring agents
46. Double bounded organic molecule used to begin addition polymerization
polyviyl chloride PVC
petroleum
vinyl monomer
polyamides
47. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
plyacrylonitrile PAN
pigments
propagation
configuration
48. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
fillers
nylon
hopper
vinyl monomer
49. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
branching
gauche conformation
polyviyl chloride PVC
secondary bonding
50. 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
trans - conformation
barrel
graft copolymers