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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. Primary raw material for most polymers
coloring agents
configuration
quenching
petroleum
2. Two or more polymers mechanically mixed together but without covalent bonding between them
blends
High volume thermoplastics HVTP
thermosets
plasticizers
3. Specific arrangements of atoms that cause organic compounds to behave in predictable ways
functional groups
free radical
vinyl monomer
spinneret
4. Polymer in which more than 85% of the amide groups are bonded to two aromatic rings
High volume thermoplastics HVTP
aramid
block copolymers
atactic
5. 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
polyamides
copolymer
polymer backbone
die
6. Terminating a condensation/step- growth polymerization reaction by adding a material with only one functional group
number average molecular weight Mn
graft copolymers
quenching
configuration
7. Stiff and extremely inert polymer - low cost - chemical and moisture resistant - outdoor stability
functional groups
structural unit
polyviyl chloride PVC
polyurethanes
8. Kevlar - Twaron - high tensile strength - lightweight - susceptible to uv degradation - nonconductive - bullet- resistant armor - sports equipment - fire resistance
polypphenylene terephyhalamide PPTA
screen pack
die
shot size
9. 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
fillers
blends
tacticity
10. Porcess of breaking large organic hydrocarbons into smaller molecules
hopper
cracking
termination
polymethylmethacrylate PMMA
11. Number of repeat/structural units in a polymer chain
configuration
degree of polymerization DPn
plasticizers
dyes
12. Is not asymetric and cannot have multiple configurations
freeze line
dyes
any carbon with double bonds or repeated substituents
High volume thermoplastics HVTP
13. Pigments or dyes that change the way light is absorbed or reflected by a polymer
poly- p- phenylene benzobisoxazole PBO
gauche conformation
syndiotactic dyad
coloring agents
14. Last step in the polymerization process - which occurs when the free radical of a polymer chain joins the free radical on an end group
plasticizers
primary termination
syndiotactic dyad
weight average molecular weight Mw
15. Covalently bonded atoms which are usualy carbon - that comprise the center of the polymer chain.
solution spinning
vinyl monomer
addition polymerization/chain growth/free- radical polymerization
polymer backbone
16. 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
extruder
plasticizers
additives
vulcanization
17. 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
mutual termination
any carbon with double bonds or repeated substituents
structural unit
melt spinning
18. Softening agents
polyurethanes
polypphenylene terephyhalamide PPTA
blends
plasticizers
19. Two substituents found at both ends of a polymer chain - which have little to no effect on mechanical properties
thermoplastics
functionality
end groups
primary bonding
20. Final step in the polymerization process - which causes the elongation of the polymer chain to come to an end
termination
block copolymers
thermoplastics
pigments
21. 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
functionality
condensation/step- growth polymerization
elastomers
viscose process
22. Technique used to make rayon - which involves treating cellulose from wood or cotton with alkali and extruding it through a spinneret
thermoplastics
screen pack
plasticizers
viscose process
23. One type of polymer that contains at least 85% of polyacrylonitrile PAN
primary termination
tacticity
acrylic
configuration
24. Molecule containing a highly reactive unpaired electron
free radical
melt spinning
glass transition temperature Tg
trans - conformation
25. Polymers that can stretch by 200% or more and still return to their original length when released; polyurethatnes and the aliphatic thermosets(rubbers)
freeze line
tow
elastomers
High volume thermoplastics HVTP
26. Small chains of bonded monomers whose properties would be altered by the addition of one more monomer unit
vinyl monomer
copolymer
plyacrylonitrile PAN
oligomers
27. 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
weight average molecular weight Mw
block copolymers
syndiotactic dyad
polymer backbone
28. Occurs when substituent are directly aligned - causing substantial repulsion between the substituents and an unfavorable conformation.
eclipsed conformation/ cis - conformation
polyesters
relative molecular mass RMM
block copolymers
29. Configuration of a polymer in which the sucstituent is located on opposite sides of the molecule in each repeating unit
vinyl monomer
polyviyl chloride PVC
nylon
syndiotactic dyad
30. Device used in the processing of polymers that melts polymer pellets and feeds them continuously through a shaping device
shot size
termination
extruder
polyurethanes
31. Additives whose primary purpose is to reduce the final cost of the product
weight average molecular weight Mw
polyamides
fillers
injection molding
32. Polymers with low melting poins due to the lack of covalent bonding between adjacent chains. such polymers can be repeatedly melted and re- formed
number average molecular weight Mn
thermoplastics
polymer backbone
addition polymerization/chain growth/free- radical polymerization
33. Atoms attached to the polymer backbone.
injection molding
side groups/ substituents
initiation
screen pack
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
melt spinning
freeze line
branching
polyesters
35. An acid and an alcohol
polyesters
termination
random copolymers
most common condensation/step- growth polymerization occur between....
36. Molecules added to a polymer to enhance or alter specific properties or molecules added to concrete for purposed other than altering a specific property
primary bonding
any carbon with double bonds or repeated substituents
additives
polyviyl chloride PVC
37. Spatial arrangement of substituents around the main chain carbon atom that can be altered only by the breaking of bonds
configuration
propagation
tacticity
polyurethanes
38. Peice of the extrusion apparatus that is used as a filter to separate unmelted particles - dirt - and other solid contaminants from the molten polymer
staggered conformation
propagation
quenching
screen pack
39. 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
eclipsed conformation/ cis - conformation
weight average molecular weight Mw
coloring agents
structural unit
40. Polymers comprised of two or more different monomer units that attach to the chain in an alternating pattern A-B-A-B...
initiation
tacticity
alternating copolymers
fillers
41. Sylon - transparent - shatter proof - biocompatible - hockey rinks - taillights - implants
condensation/step- growth polymerization
extruder
petroleum
poly- p- phenylene benzobisoxazole PBO
42. 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
additives
configuration
condensation/step- growth polymerization
solution spinning
43. Term used to describe a polymer that contains significant numbers of both syndiotactic and isotactic dyads
relative molecular mass RMM
atactic
polymers
dyes
44. Carbon atom capable of multiple configurations due to four different substituents
block copolymers
polymer backbone
asymetric
blends
45. 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
polymers
block copolymers
plyacrylonitrile PAN
step- growth/condensation polymerization
46. Polymers that cannot be repeatedly melted and re- formed due to strong covalent bonding between chains
gauche conformation
die
thermosets
random copolymers
47. Covalent bonding of the polymer backbone and side groups
degree of polymerization DPn
petroleum
constitution
primary bonding
48. First step in the process of polymerization - during which a free radical is formed
vulcanization
initiation
plyacrylonitrile PAN
polyesters
49. Simple polymeric material produced as pellets in large quantities
eclipsed conformation/ cis - conformation
relative molecular mass RMM
trans - conformation
High volume thermoplastics HVTP
50. Refers to the spatial geometry of the main chain carbon and substituents that can be changed by rotation and flexural motion
functional groups
most common condensation/step- growth polymerization occur between....
conformation
coloring agents