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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. Second stage of polymerization process during which the polymer chain begins to go as monomers are added to the chain
tacticity
propagation
secondary bonding
initiation
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
elastomers
any carbon with double bonds or repeated substituents
free radical
melt spinning
3. Polymers comprised of two or more different monomers - which attach to the polymer chain in no particular order of pattern
copolymer
freeze line
polyamides
random copolymers
4. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
aramid
thermosets
eclipsed conformation/ cis - conformation
plasticizers
5. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
plasticizers
thermoplastics
High volume thermoplastics HVTP
staggered conformation
6. Porcess of breaking large organic hydrocarbons into smaller molecules
polyviyl chloride PVC
constitution
plasticizers
cracking
7. Lightwieght polymer that absorbs water well; the first syntheric polymer ever constructed
rayon
homopolymer
relative molecular mass RMM
shot size
8. First step in the process of polymerization - during which a free radical is formed
plasticizers
primary termination
polyesters
initiation
9. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
polyviyl chloride PVC
conformation
injection molding
poly- p- phenylene benzobisoxazole PBO
10. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
constitution
isotactic dan
vulcanization
primary termination
11. 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
plasticizers
spinneret
secondary bonding
blends
12. 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
side groups/ substituents
mutual termination
plasticizers
condensation/step- growth polymerization
13. Two or more polymers mechanically mixed together but without covalent bonding between them
blends
propagation
screen pack
vinyl monomer
14. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
relative molecular mass RMM
coloring agents
hopper
glass transition temperature Tg
15. Orlon - acrilan - lightweight - durable - carbon - fiber precursor - tennis - racing bikes - helmets
isotactic dan
nylon
plyacrylonitrile PAN
aramid
16. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
termination
elastomers
structural unit
poly- p- phenylene benzobisoxazole PBO
17. Number of repeat/structural units in a polymer chain
free radical
degree of polymerization DPn
secondary bonding
pigments
18. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
staggered conformation
polyviyl chloride PVC
most common condensation/step- growth polymerization occur between....
polyurethanes
19. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
polypphenylene terephyhalamide PPTA
die
polymer backbone
polyesters
20. Plexiglas - lucite - transparent - shatterproof - biocompatible - hockey rinks - taillights - implants
conformation
polymethylmethacrylate PMMA
quenching
melt spinning
21. Carbon atom capable of multiple configurations due to four different substituents
primary termination
degree of polymerization DPn
asymetric
configuration
22. Arrangement of the largest substituents where the substituets are offset by 120
fillers
acrylic
alternating copolymers
staggered conformation
23. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
viscose process
extruder
graft copolymers
elastomers
24. 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
degree of polymerization DPn
oligomers
primary bonding
25. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
barrel
condensation/step- growth polymerization
atactic
branching
26. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
condensation/step- growth polymerization
elastomers
plyacrylonitrile PAN
copolymer
27. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
plasticizers
poly- p- phenylene benzobisoxazole PBO
end groups
atactic
28. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
freeze line
polypphenylene terephyhalamide PPTA
extruder
oligomers
29. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
addition polymerization/chain growth/free- radical polymerization
vinyl monomer
spinneret
vulcanization
30. 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
plasticizers
glass transition temperature Tg
solution spinning
31. Conformation in which the largest substituents are offset by 180
trans - conformation
oligomers
gauche conformation
cracking
32. Covalently bonded chains of molecules with small monomer units repeated from end to end
polymers
structural unit
isotactic dan
pigments
33. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
quenching
branching
functional groups
weight average molecular weight Mw
34. 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
spinneret
gauche conformation
weight average molecular weight Mw
branching
35. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
injection molding
coloring agents
spinneret
High volume thermoplastics HVTP
36. Smallest repeating unit in a polymer. aka repeat unit
aramid
fillers
structural unit
vulcanization
37. 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
glass transition temperature Tg
freeze line
polyurethanes
end groups
38. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
polymethylmethacrylate PMMA
viscose process
trans - conformation
condensation/step- growth polymerization
39. 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
polypphenylene terephyhalamide PPTA
vulcanization
block copolymers
isotactic dan
40. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
polymer backbone
syndiotactic dyad
cracking
trans - conformation
41. 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
syndiotactic dyad
step- growth/condensation polymerization
degree of polymerization DPn
plasticizers
42. Term associate with blown - film apparatus - which indicated the point at which the molecules develop a more crystalline orientation around the bubble of air
homopolymer
conformation
condensation/step- growth polymerization
freeze line
43. Is not asymetric and cannot have multiple configurations
tow
any carbon with double bonds or repeated substituents
mutual termination
end groups
44. Polymers that contain amide (- N-) groups in the chain
polyesters
stabilizers
polyamides
number average molecular weight Mn
45. An acid and an alcohol
termination
elastomers
syndiotactic dyad
most common condensation/step- growth polymerization occur between....
46. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
High volume thermoplastics HVTP
blends
end groups
tow
47. 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
termination
initiation
polypphenylene terephyhalamide PPTA
48. High distance- dependent bonding between adjacent polymer chains; usually includes hydrogen bonding - dipoles - and van der waals
conformation
elastomers
secondary bonding
structural unit
49. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
extruder
rayon
syndiotactic dyad
constitution
50. Circular - stationary block with small holes through which molten polymer can flow to take the shape of a fiber
injection molding
solution spinning
shot size
spinneret