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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. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
viscose process
thermosets
coloring agents
block copolymers
2. 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
tacticity
initiation
relative molecular mass RMM
functional groups
3. First step in the process of polymerization - during which a free radical is formed
vinyl monomer
initiation
plasticizers
degree of polymerization DPn
4. Covalent bonding of the polymer backbone and side groups
structural unit
additives
primary bonding
side groups/ substituents
5. Atoms attached to the polymer backbone.
quenching
side groups/ substituents
dyes
melt spinning
6. Two or more polymers mechanically mixed together but without covalent bonding between them
tow
blends
isotactic dan
condensation/step- growth polymerization
7. Type of polyamide in which less that 85% of the amide groups are bonded to the aromatic rings
nylon
vulcanization
monomers
asymetric
8. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
vulcanization
isotactic dan
oligomers
monomers
9. Coloring agent that is dissolved directly into the polymer - causing the polymer to change color
syndiotactic dyad
polyviyl chloride PVC
dyes
screen pack
10. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
eclipsed conformation/ cis - conformation
monomers
poly- p- phenylene benzobisoxazole PBO
polyurethanes
11. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
polyviyl chloride PVC
weight average molecular weight Mw
quenching
hopper
12. Number of repeat/structural units in a polymer chain
graft copolymers
extruder
mutual termination
degree of polymerization DPn
13. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
trans - conformation
polypphenylene terephyhalamide PPTA
melt spinning
asymetric
14. Primary raw material for most polymers
petroleum
vulcanization
blends
conformation
15. Specified weight of a polymer that is injected into the mold at the end of the barrel during the injection molding process
vulcanization
screen pack
polypphenylene terephyhalamide PPTA
shot size
16. Broad category of polymers that includes polymers containing urethane linkages
polyurethanes
staggered conformation
alternating copolymers
thermosets
17. Polymers that contain amide (- N-) groups in the chain
polyamides
weight average molecular weight Mw
polyurethanes
block copolymers
18. Molecule containing a highly reactive unpaired electron
free radical
weight average molecular weight Mw
block copolymers
tow
19. Porcess of breaking large organic hydrocarbons into smaller molecules
polyamides
High volume thermoplastics HVTP
cracking
plasticizers
20. Type of plymer processing similar to extrusion but can be used to develop parts with complex shapes rapidly
injection molding
alternating copolymers
polyviyl chloride PVC
monomers
21. 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
fillers
staggered conformation
glass transition temperature Tg
copolymer
22. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
polyamides
termination
atactic
branching
23. 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
rayon
polymers
24. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
thermoplastics
functional groups
homopolymer
barrel
25. Part of the extrusion apparatus that hols a large quantity of polymer pellets as they are fed into the barrel
injection molding
rayon
hopper
syndiotactic dyad
26. Process by which chemical cross - linkages can form between adjacent polymer chains - strengthening the material without significantly damaging its elastic properties
coloring agents
polyamides
vulcanization
freeze line
27. Additives that improve a polymer's resistance to variable that cause bonds to rupture - such as heat and light
block copolymers
vulcanization
stabilizers
polypphenylene terephyhalamide PPTA
28. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
branching
relative molecular mass RMM
step- growth/condensation polymerization
screen pack
29. Double bounded organic molecule used to begin addition polymerization
spinneret
vinyl monomer
polymers
solution spinning
30. 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
quenching
coloring agents
weight average molecular weight Mw
polyesters
31. Covalently bonded chains of molecules with small monomer units repeated from end to end
dyes
quenching
configuration
polymers
32. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
side groups/ substituents
gauche conformation
condensation/step- growth polymerization
quenching
33. On of the two most common reaction schemes used to create polymers - involving three steps: initiaition - propogation - and termination
stabilizers
tacticity
coloring agents
addition polymerization/chain growth/free- radical polymerization
34. 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
pigments
plasticizers
polyviyl chloride PVC
fillers
35. Number of bonds a molecule has formed
functionality
plasticizers
polyurethanes
end groups
36. 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
branching
tacticity
free radical
constitution
37. Arrangement of the largest substituents where the substituets are offset by 120
aramid
petroleum
melt spinning
staggered conformation
38. 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
screen pack
cracking
block copolymers
oligomers
39. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
vulcanization
die
configuration
additives
40. Coloring agents that do not dissolve into the polymer
configuration
pigments
extruder
most common condensation/step- growth polymerization occur between....
41. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
vinyl monomer
isotactic dan
syndiotactic dyad
monomers
42. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
freeze line
additives
step- growth/condensation polymerization
atactic
43. Large spool that is used to wind solidified polymer fibers after they have been pushed through the spinneret
graft copolymers
coloring agents
tow
rayon
44. Polymers in which one chain of a particular monomer is attached as a side to a chain of another chain of monomer
constitution
graft copolymers
oligomers
conformation
45. Is not asymetric and cannot have multiple configurations
plyacrylonitrile PAN
spinneret
any carbon with double bonds or repeated substituents
mutual termination
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
condensation/step- growth polymerization
screen pack
structural unit
rayon
47. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
poly- p- phenylene benzobisoxazole PBO
additives
number average molecular weight Mn
termination
48. Additives whose primary purpose is to reduce the final cost of the product
fillers
screen pack
secondary bonding
primary termination
49. All issues related to bonding in polymers including primary and secondary bonding - branching - formations of networks - and end groups
side groups/ substituents
constitution
alternating copolymers
vinyl monomer
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
barrel
polyesters
polyviyl chloride PVC
injection molding